{"id":1980,"date":"2026-04-17T16:53:41","date_gmt":"2026-04-17T08:53:41","guid":{"rendered":"http:\/\/www.preluna.xyz\/?p=1980"},"modified":"2026-04-17T19:26:29","modified_gmt":"2026-04-17T11:26:29","slug":"1980","status":"publish","type":"post","link":"http:\/\/www.preluna.xyz\/index.php\/2026\/04\/17\/1980\/preluna\/text\/","title":{"rendered":"IPv4\u4e09\u4e2a\u96be\u70b9"},"content":{"rendered":"\n<figure class=\"wp-block-image size-large\"><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='http:\/\/www.preluna.xyz\/wp-content\/uploads\/2026\/04\/78-768x1024.jpg'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  loading=\"lazy\" decoding=\"async\" width=\"768\" height=\"1024\" data-original=\"http:\/\/www.preluna.xyz\/wp-content\/uploads\/2026\/04\/78-768x1024.jpg\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\" class=\"wp-image-1981\"  sizes=\"auto, (max-width: 768px) 100vw, 768px\" \/><\/div><\/figure>\n\n\n\n<p>\u8fd9\u4e24\u4e2a\u95ee\u9898\u5176\u5b9e\u521a\u597d\u8fde\u5728\u4e00\u8d77\u4e86\u3002<\/p>\n\n\n\n<p>\u7b2c 7 \u9898\u7684\u672c\u8d28\uff0c\u4e0d\u662f\u201c\u628a\u5341\u516d\u8fdb\u5236\u5168\u90e8\u8001\u8001\u5b9e\u5b9e\u8f6c\u6210\u5341\u8fdb\u5236\u201d\uff0c\u800c\u662f\u201c\u5229\u7528\u5341\u516d\u8fdb\u5236\u548c\u4e8c\u8fdb\u5236\u7684\u5929\u7136\u5bf9\u5e94\u5173\u7cfb\uff0c\u76f4\u63a5\u505a\u524d\u7f00\u5339\u914d\u201d\uff1b\u7b2c 8 \u9898\u7684\u672c\u8d28\uff0c\u4e0d\u662f\u201cLAN1 \u5305\u542b LAN2\uff5eLAN5\u201d\uff0c\u800c\u662f\u201c\u6574\u4e2a \/23 \u5730\u5740\u5757\u88ab\u5207\u6210 5 \u4e2a\u5f7c\u6b64\u72ec\u7acb\u7684\u5b50\u7f51\uff0c\u5176\u4e2d LAN1 \u53ea\u662f\u5176\u4e2d\u4e00\u4e2a\u5b50\u7f51\uff0c\u800c\u4e14\u662f\u8def\u7531\u5668\u4e92\u8fde\u7528\u7684\u4e2d\u8f6c\u7f51\u6bb5\u201d\u3002<\/p>\n\n\n\n<p>\u4e0b\u9762\u5206\u5f00\u8bb2\u3002<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">\u4e00\u3001\u7b2c 7 \u9898\u91cc\uff0c\u5341\u516d\u8fdb\u5236\u548c\u5341\u8fdb\u5236\u5230\u5e95\u600e\u4e48\u5feb\u901f\u8f6c\u6362<\/h2>\n\n\n\n<p>\u5148\u8bb0\u4e00\u4e2a\u6700\u6838\u5fc3\u7684\u5bf9\u5e94\uff1a<\/p>\n\n\n\n<p>\u6bcf 1 \u4f4d\u5341\u516d\u8fdb\u5236 = 4 \u4f4d\u4e8c\u8fdb\u5236<\/p>\n\n\n\n<p>\u6240\u4ee5\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><code>A = 10<\/code><\/li>\n\n\n\n<li><code>B = 11<\/code><\/li>\n\n\n\n<li><code>C = 12<\/code><\/li>\n\n\n\n<li><code>D = 13<\/code><\/li>\n\n\n\n<li><code>E = 14<\/code><\/li>\n\n\n\n<li><code>F = 15<\/code><\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">1\uff09\u5341\u516d\u8fdb\u5236\u8f6c\u5341\u8fdb\u5236\uff0c\u6700\u5feb\u7684\u65b9\u6cd5<\/h3>\n\n\n\n<p>\u4e24\u4f4d\u5341\u516d\u8fdb\u5236 <code>XY<\/code>\uff1a<\/p>\n\n\n\n<p><code>XY(\u5341\u516d\u8fdb\u5236) = X \u00d7 16 + Y<\/code><\/p>\n\n\n\n<p>\u4f8b\u5982\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><code>C4 = 12 \u00d7 16 + 4 = 196<\/code><\/li>\n\n\n\n<li><code>5E = 5 \u00d7 16 + 14 = 94<\/code><\/li>\n\n\n\n<li><code>68 = 6 \u00d7 16 + 8 = 104<\/code><\/li>\n<\/ul>\n\n\n\n<p>\u6240\u4ee5\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><code>C4.5E.13.87<\/code><br>\u53ef\u4ee5\u770b\u6210\u5341\u8fdb\u5236\u7684<br><code>196.94.19.135<\/code><\/li>\n<\/ul>\n\n\n\n<p>\u4f46\u8fd9\u91cc\u8981\u6ce8\u610f\uff1a<strong>\u8fd9\u9898\u5176\u5b9e\u901a\u5e38\u6ca1\u5fc5\u8981\u5168\u90e8\u8f6c\u6210\u5341\u8fdb\u5236\u518d\u505a\u3002<\/strong><\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">2\uff09\u5341\u8fdb\u5236\u8f6c\u5341\u516d\u8fdb\u5236\uff0c\u6700\u5feb\u7684\u65b9\u6cd5<\/h3>\n\n\n\n<p>\u505a\u201c\u9664 16 \u53d6\u4f59\u201d\u3002<\/p>\n\n\n\n<p>\u4f8b\u5982 <code>94<\/code>\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><code>94 \u00f7 16 = 5 ... 14<\/code><\/li>\n\n\n\n<li>14 \u5bf9\u5e94 <code>E<\/code><\/li>\n\n\n\n<li>\u6240\u4ee5 <code>94 = 5E<\/code><\/li>\n<\/ul>\n\n\n\n<p>\u4f8b\u5982 <code>196<\/code>\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><code>196 \u00f7 16 = 12 ... 4<\/code><\/li>\n\n\n\n<li>12 \u5bf9\u5e94 <code>C<\/code><\/li>\n\n\n\n<li>\u6240\u4ee5 <code>196 = C4<\/code><\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">\u4e8c\u3001\u7b2c 7 \u9898\u66f4\u5feb\u7684\u505a\u6cd5\uff1a\u6839\u672c\u4e0d\u7528\u5b8c\u6574\u8f6c\u5341\u8fdb\u5236<\/h2>\n\n\n\n<p>\u8fd9\u9898\u662f CIDR \u6700\u957f\u524d\u7f00\u5339\u914d\uff0c\u800c\u4e14\u9898\u76ee\u91cc\u7684\u5730\u5740\u672c\u6765\u5c31\u662f\u5341\u516d\u8fdb\u5236\u5199\u7684\uff0c\u6240\u4ee5\u6700\u7701\u65f6\u95f4\u7684\u65b9\u6cd5\u662f\uff1a<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u76f4\u63a5\u6309\u201c\u5341\u516d\u8fdb\u5236\u4f4d\u6570\u201d\u770b\u524d\u7f00<\/h3>\n\n\n\n<p>\u56e0\u4e3a\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><code>\/4<\/code> = \u6bd4\u8f83 1 \u4e2a\u5341\u516d\u8fdb\u5236\u4f4d<\/li>\n\n\n\n<li><code>\/8<\/code> = \u6bd4\u8f83 2 \u4e2a\u5341\u516d\u8fdb\u5236\u4f4d<\/li>\n\n\n\n<li><code>\/12<\/code> = \u6bd4\u8f83 3 \u4e2a\u5341\u516d\u8fdb\u5236\u4f4d<\/li>\n\n\n\n<li><code>\/16<\/code> = \u6bd4\u8f83 4 \u4e2a\u5341\u516d\u8fdb\u5236\u4f4d<\/li>\n\n\n\n<li><code>\/20<\/code> = \u6bd4\u8f83 5 \u4e2a\u5341\u516d\u8fdb\u5236\u4f4d<\/li>\n\n\n\n<li><code>\/24<\/code> = \u6bd4\u8f83 6 \u4e2a\u5341\u516d\u8fdb\u5236\u4f4d<\/li>\n<\/ul>\n\n\n\n<p>\u8fd9\u5728\u8003\u573a\u4e0a\u7279\u522b\u597d\u7528\u3002<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">\u4e09\u3001\u7b2c 7 \u9898\u600e\u4e48\u505a<\/h2>\n\n\n\n<p>\u9898\u76ee\u8def\u7531\u8868\u662f\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><code>C4.50.0.0\/12 -> A<\/code><\/li>\n\n\n\n<li><code>C4.5E.10.0\/20 -> B<\/code><\/li>\n\n\n\n<li><code>C4.60.0.0\/12 -> C<\/code><\/li>\n\n\n\n<li><code>C4.68.0.0\/14 -> D<\/code><\/li>\n\n\n\n<li><code>80.0.0.0\/1 -> E<\/code><\/li>\n\n\n\n<li><code>40.0.0.0\/2 -> F<\/code><\/li>\n\n\n\n<li><code>00.0.0.0\/2 -> G<\/code><\/li>\n<\/ul>\n\n\n\n<p>\u6ce8\u610f\u539f\u5219\uff1a<strong>\u5339\u914d\u591a\u4e2a\u65f6\uff0c\u9009\u524d\u7f00\u6700\u957f\u7684\u3002<\/strong><\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">1\uff09<code>C4.5E.13.87<\/code><\/h3>\n\n\n\n<p>\u5148\u770b\uff1a<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">\u5339\u914d <code>C4.50.0.0\/12 -&gt; A<\/code><\/h4>\n\n\n\n<p><code>\/12<\/code> \u6bd4\u8f83\u524d 3 \u4e2a\u5341\u516d\u8fdb\u5236\u4f4d\u3002<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u8def\u7531\u9879\uff1a<code>C45<\/code><\/li>\n\n\n\n<li>\u76ee\u6807\u5730\u5740\uff1a<code>C45<\/code><\/li>\n<\/ul>\n\n\n\n<p>\u5339\u914d\uff0c\u8bf4\u660e\u53ef\u5230 A\u3002<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">\u5339\u914d <code>C4.5E.10.0\/20 -&gt; B<\/code><\/h4>\n\n\n\n<p><code>\/20<\/code> \u6bd4\u8f83\u524d 5 \u4e2a\u5341\u516d\u8fdb\u5236\u4f4d\u3002<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u8def\u7531\u9879\uff1a<code>C45E1<\/code><\/li>\n\n\n\n<li>\u76ee\u6807\u5730\u5740\uff1a<code>C45E1<\/code><\/li>\n<\/ul>\n\n\n\n<p>\u4e5f\u5339\u914d\uff0c\u8bf4\u660e\u4e5f\u53ef\u5230 B\u3002<\/p>\n\n\n\n<p><code>\/20<\/code> \u6bd4 <code>\/12<\/code> \u66f4\u957f\uff0c\u6240\u4ee5\u9009 <strong>B<\/strong>\u3002<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">2\uff09<code>C4.5E.22.09<\/code><\/h3>\n\n\n\n<h4 class=\"wp-block-heading\">\u5339\u914d <code>C4.50.0.0\/12 -&gt; A<\/code><\/h4>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u524d 3 \u4e2a\u5341\u516d\u8fdb\u5236\u4f4d\uff1a<code>C45<\/code><\/li>\n\n\n\n<li>\u76ee\u6807\u5730\u5740\u4e5f\u662f <code>C45<\/code><\/li>\n<\/ul>\n\n\n\n<p>\u5339\u914d\u3002<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">\u5339\u914d <code>C4.5E.10.0\/20 -&gt; B<\/code><\/h4>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u8def\u7531\u9879\u524d 5 \u4f4d\uff1a<code>C45E1<\/code><\/li>\n\n\n\n<li>\u76ee\u6807\u5730\u5740\u524d 5 \u4f4d\uff1a<code>C45E2<\/code><\/li>\n<\/ul>\n\n\n\n<p>\u4e0d\u5339\u914d\u3002<\/p>\n\n\n\n<p>\u6240\u4ee5\u8fd9\u4e00\u9879\u4e0d\u80fd\u8d70 B\uff0c\u53ea\u80fd\u8d70 <strong>A<\/strong>\u3002<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">3\uff09<code>C3.41.80.02<\/code><\/h3>\n\n\n\n<p>\u524d\u9762\u51e0\u4e2a <code>C4...<\/code> \u663e\u7136\u90fd\u4e0d\u5339\u914d\u3002<\/p>\n\n\n\n<p>\u518d\u770b <code>80.0.0.0\/1 -&gt; E<\/code><\/p>\n\n\n\n<p><code>\/1<\/code> \u8868\u793a\u53ea\u770b\u6700\u9ad8 1 \u4f4d\u4e8c\u8fdb\u5236\u3002<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><code>C3<\/code> \u7684\u7b2c\u4e00\u4f4d\u4e8c\u8fdb\u5236\u662f <code>1<\/code>\uff0c\u56e0\u4e3a <code>C=1100<\/code><\/li>\n<\/ul>\n\n\n\n<p>\u6240\u4ee5\u5339\u914d <code>80.0.0.0\/1<\/code>\uff0c\u8d70 <strong>E<\/strong>\u3002<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">4\uff09<code>5E.43.91.12<\/code><\/h3>\n\n\n\n<p>\u770b\u524d\u51e0\u4e2a <code>C4...<\/code> \u90fd\u4e0d\u5339\u914d\u3002<\/p>\n\n\n\n<p>\u518d\u770b\uff1a<\/p>\n\n\n\n<h4 class=\"wp-block-heading\"><code>80.0.0.0\/1 -&gt; E<\/code><\/h4>\n\n\n\n<p><code>5E<\/code> \u7684\u6700\u9ad8\u4f4d\u662f 0\uff0c\u56e0\u4e3a <code>5 = 0101<\/code><br>\u6240\u4ee5\u4e0d\u5339\u914d E\u3002<\/p>\n\n\n\n<h4 class=\"wp-block-heading\"><code>40.0.0.0\/2 -&gt; F<\/code><\/h4>\n\n\n\n<p><code>\/2<\/code> \u770b\u6700\u9ad8\u4e24\u4f4d\u3002<br><code>5<\/code> \u7684\u4e8c\u8fdb\u5236\u662f <code>0101<\/code>\uff0c\u6700\u9ad8\u4e24\u4f4d\u662f <code>01<\/code>\uff0c\u6b63\u597d\u5bf9\u5e94 <code>40.0.0.0\/2<\/code>\u3002<\/p>\n\n\n\n<p>\u6240\u4ee5\u8d70 <strong>F<\/strong>\u3002<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">\u7b2c 7 \u9898\u7b54\u6848<\/h3>\n\n\n\n<ol class=\"wp-block-list\">\n<li><code>C4.5E.13.87<\/code> \u2192 <strong>B<\/strong><\/li>\n\n\n\n<li><code>C4.5E.22.09<\/code> \u2192 <strong>A<\/strong><\/li>\n\n\n\n<li><code>C3.41.80.02<\/code> \u2192 <strong>E<\/strong><\/li>\n\n\n\n<li><code>5E.43.91.12<\/code> \u2192 <strong>F<\/strong><\/li>\n<\/ol>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">\u56db\u3001\u7b2c 7 \u9898\u91cc\u6700\u503c\u5f97\u80cc\u4e0b\u6765\u7684\u201c\u901f\u5224\u6280\u5de7\u201d<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">1\uff09\u524d\u7f00\u521a\u597d\u662f 4 \u7684\u500d\u6570\u65f6\uff0c\u76f4\u63a5\u6309\u5341\u516d\u8fdb\u5236\u4f4d\u6bd4\u8f83<\/h3>\n\n\n\n<p>\u8fd9\u662f\u6700\u91cd\u8981\u7684\u3002<\/p>\n\n\n\n<p>\u6bd4\u5982\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><code>\/12<\/code> \u5c31\u6bd4\u524d 3 \u4e2a\u5341\u516d\u8fdb\u5236\u4f4d<\/li>\n\n\n\n<li><code>\/20<\/code> \u5c31\u6bd4\u524d 5 \u4e2a\u5341\u516d\u8fdb\u5236\u4f4d<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">2\uff09<code>\/1<\/code>\u3001<code>\/2<\/code> \u8fd9\u79cd\u5c31\u770b\u7b2c\u4e00\u4f4d\u5341\u516d\u8fdb\u5236\u6570\u5b57<\/h3>\n\n\n\n<p>\u56e0\u4e3a 1 \u4f4d\u5341\u516d\u8fdb\u5236 = 4 \u4f4d\u4e8c\u8fdb\u5236\uff0c\u6240\u4ee5\u7b2c\u4e00\u4f4d\u5341\u516d\u8fdb\u5236\u6570\u5b57\u5c31\u80fd\u770b\u51fa\u6700\u9ad8\u51e0\u4f4d\u3002<\/p>\n\n\n\n<p>\u7b2c\u4e00\u4f4d\u5341\u516d\u8fdb\u5236\u6570\u5b57\u4e0e\u6700\u9ad8\u4e24\u4f4d\u4e8c\u8fdb\u5236\u7684\u5bf9\u5e94\u5173\u7cfb\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><code>0 ~ 3<\/code>\uff1a\u6700\u9ad8\u4e24\u4f4d\u662f <code>00<\/code><\/li>\n\n\n\n<li><code>4 ~ 7<\/code>\uff1a\u6700\u9ad8\u4e24\u4f4d\u662f <code>01<\/code><\/li>\n\n\n\n<li><code>8 ~ B<\/code>\uff1a\u6700\u9ad8\u4e24\u4f4d\u662f <code>10<\/code><\/li>\n\n\n\n<li><code>C ~ F<\/code>\uff1a\u6700\u9ad8\u4e24\u4f4d\u662f <code>11<\/code><\/li>\n<\/ul>\n\n\n\n<p>\u6240\u4ee5\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><code>00.0.0.0\/2<\/code> \u8986\u76d6\u7b2c\u4e00\u4f4d\u5341\u516d\u8fdb\u5236\u662f <code>0~3<\/code><\/li>\n\n\n\n<li><code>40.0.0.0\/2<\/code> \u8986\u76d6\u7b2c\u4e00\u4f4d\u5341\u516d\u8fdb\u5236\u662f <code>4~7<\/code><\/li>\n\n\n\n<li><code>80.0.0.0\/1<\/code> \u8986\u76d6\u6700\u9ad8\u4f4d\u4e3a 1\uff0c\u4e5f\u5c31\u662f\u7b2c\u4e00\u4f4d\u5341\u516d\u8fdb\u5236\u662f <code>8~F<\/code><\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">3\uff09\u4e0d\u662f 4 \u7684\u500d\u6570\u7684\u524d\u7f00\uff0c\u8981\u7279\u522b\u5c0f\u5fc3<\/h3>\n\n\n\n<p>\u6bd4\u5982\u8fd9\u9898\u7684 <code>\/14<\/code>\u3002<\/p>\n\n\n\n<p><code>\/14<\/code> \u4e0d\u662f\u6574 4 \u4f4d\uff0c\u6240\u4ee5\u4e0d\u80fd\u53ea\u673a\u68b0\u5730\u770b 3 \u4e2a\u5341\u516d\u8fdb\u5236\u4f4d\uff0c\u800c\u8981\u591a\u770b 2 \u4f4d\u4e8c\u8fdb\u5236\u3002<\/p>\n\n\n\n<p><code>C4.68.0.0\/14<\/code> \u7684\u8303\u56f4\u5176\u5b9e\u662f\uff1a<\/p>\n\n\n\n<p><code>C4.68.0.0 ~ C4.6B.FF.FF<\/code><\/p>\n\n\n\n<p>\u56e0\u4e3a\u7b2c\u4e8c\u4e2a\u5b57\u8282 <code>68<\/code>\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><code>68 = 01101000<\/code><\/li>\n\n\n\n<li>\u4fdd\u7559\u524d 6 \u4f4d <code>011010<\/code><\/li>\n\n\n\n<li>\u540e 2 \u4f4d\u53ef\u53d8\u6210 <code>00, 01, 10, 11<\/code><\/li>\n\n\n\n<li>\u6240\u4ee5\u7b2c\u4e8c\u4e2a\u5b57\u8282\u53ef\u4ee5\u662f\uff1a<code>68, 69, 6A, 6B<\/code><\/li>\n<\/ul>\n\n\n\n<p>\u8fd9\u4e00\u7c7b\u9898\u7ecf\u5e38\u62ff\u6765\u8bbe\u9677\u9631\u3002<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">\u4e94\u3001\u7b2c 8 \u9898\u4f60\u771f\u6b63\u56f0\u60d1\u7684\u70b9\uff1aLAN1 \u4e3a\u4ec0\u4e48\u201c\u4e0d\u5305\u542b\u201d LAN2\uff5eLAN5<\/h2>\n\n\n\n<p>\u8fd9\u4e2a\u5730\u65b9\u975e\u5e38\u5178\u578b\uff0c\u5f88\u591a\u4eba\u7b2c\u4e00\u6b21\u5b66\u5b50\u7f51\u5212\u5206\u90fd\u4f1a\u6df7\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u5148\u8bf4\u7ed3\u8bba<\/h3>\n\n\n\n<p><strong>LAN1 \u5e76\u4e0d\u662f LAN2\uff5eLAN5 \u7684\u201c\u7236\u7f51\u201d\u6216\u8005\u201c\u5916\u5c42\u7f51\u201d\u3002<\/strong><\/p>\n\n\n\n<p>\u8fd9\u9898\u91cc\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><code>30.138.118.0\/23<\/code> \u624d\u662f\u6574\u4e2a\u81ea\u6cbb\u7cfb\u7edf\u62ff\u5230\u7684\u201c\u603b\u5730\u5740\u5757\u201d<\/li>\n\n\n\n<li>\u7136\u540e\u628a\u8fd9\u4e2a\u603b\u5730\u5740\u5757\u518d\u5207\u6210 5 \u4e2a\u5b50\u7f51<\/li>\n\n\n\n<li>\u8fd9 5 \u4e2a\u5b50\u7f51\u5206\u522b\u5206\u7ed9\uff1a\n<ul class=\"wp-block-list\">\n<li>LAN1<\/li>\n\n\n\n<li>LAN2<\/li>\n\n\n\n<li>LAN3<\/li>\n\n\n\n<li>LAN4<\/li>\n\n\n\n<li>LAN5<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n\n\n\n<p>\u6240\u4ee5\u5b83\u4eec\u662f <strong>\u5e76\u5217\u5173\u7cfb<\/strong>\uff0c\u4e0d\u662f\u201c\u5305\u542b\u5173\u7cfb\u201d\u3002<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">\u516d\u3001LAN1 \u5728\u56fe\u91cc\u5230\u5e95\u662f\u4ec0\u4e48<\/h2>\n\n\n\n<p>\u56fe\u91cc\u7684 LAN1 \u662f\u4e0b\u65b9\u90a3\u6761\u6a2a\u7ebf\uff0c\u5b83\u8fde\u63a5\u4e86\u51e0\u53f0\u8def\u7531\u5668\u3002<\/p>\n\n\n\n<p>\u8fd9\u8bf4\u660e\uff1a<\/p>\n\n\n\n<p><strong>LAN1 \u662f\u4e00\u4e2a\u201c\u8def\u7531\u5668\u4e4b\u95f4\u4e92\u8054\u7684\u5c40\u57df\u7f51\/\u9aa8\u5e72\u7f51\u6bb5\/\u4e2d\u8f6c\u7f51\u6bb5\u201d\u3002<\/strong><\/p>\n\n\n\n<p>\u800c\u4e0a\u9762\u7684 LAN2\u3001LAN3\u3001LAN4\u3001LAN5 \u5219\u662f\u8fd9\u4e9b\u8def\u7531\u5668\u8fde\u63a5\u51fa\u53bb\u7684\u5176\u4ed6\u5c40\u57df\u7f51\u3002<\/p>\n\n\n\n<p>\u4e5f\u5c31\u662f\u8bf4\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>LAN1 \u662f\u4e00\u4e2a\u72ec\u7acb\u5b50\u7f51<\/li>\n\n\n\n<li>LAN2 \u662f\u4e00\u4e2a\u72ec\u7acb\u5b50\u7f51<\/li>\n\n\n\n<li>LAN3 \u662f\u4e00\u4e2a\u72ec\u7acb\u5b50\u7f51<\/li>\n\n\n\n<li>LAN4 \u662f\u4e00\u4e2a\u72ec\u7acb\u5b50\u7f51<\/li>\n\n\n\n<li>LAN5 \u662f\u4e00\u4e2a\u72ec\u7acb\u5b50\u7f51<\/li>\n<\/ul>\n\n\n\n<p>\u5b83\u4eec\u4e92\u76f8\u4e4b\u95f4\u9760\u8def\u7531\u5668\u8f6c\u53d1\uff0c\u4e0d\u662f\u9760\u201cLAN1 \u5305\u4f4f\u5b83\u4eec\u201d\u3002<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">\u4e03\u3001\u662f\u4e0d\u662f\u201c\u4e00\u4e2a\u8def\u7531\u6709\u4e24\u4e2a\u5730\u5740\uff0c\u4e00\u4e2a\u7ed9\u5916\u9762\u770b\uff0c\u4e00\u4e2a\u7ed9\u91cc\u9762\u770b\u201d<\/h2>\n\n\n\n<p>\u8fd9\u4e2a\u8bf4\u6cd5\u6709\u4e00\u70b9\u63a5\u8fd1\uff0c\u4f46\u8003\u7814\u91cc\u66f4\u51c6\u786e\u7684\u8868\u8fbe\u4e0d\u662f\u8fd9\u4e2a\u3002<\/p>\n\n\n\n<p>\u66f4\u51c6\u786e\u7684\u8bf4\u6cd5\u662f\uff1a<\/p>\n\n\n\n<p><strong>\u8def\u7531\u5668\u7684\u6bcf\u4e00\u4e2a\u63a5\u53e3\uff0c\u90fd\u5c5e\u4e8e\u4e00\u4e2a\u4e0d\u540c\u7684 IP \u5b50\u7f51\uff1b\u6bcf\u4e2a\u63a5\u53e3\u90fd\u8981\u914d\u7f6e\u8be5\u5b50\u7f51\u4e2d\u7684\u4e00\u4e2a IP \u5730\u5740\u3002<\/strong><\/p>\n\n\n\n<p>\u6bd4\u5982\u56fe\u91cc\u5de6\u8fb9\u90a3\u53f0\u8def\u7531\u5668\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u5b83\u63a5\u5230 LAN1 \u7684\u90a3\u4e2a\u63a5\u53e3\uff0c\u8981\u6709\u4e00\u4e2a LAN1 \u7f51\u6bb5\u7684 IP<\/li>\n\n\n\n<li>\u5b83\u63a5\u5230 LAN2 \u7684\u90a3\u4e2a\u63a5\u53e3\uff0c\u8fd8\u8981\u6709\u4e00\u4e2a LAN2 \u7f51\u6bb5\u7684 IP<\/li>\n<\/ul>\n\n\n\n<p>\u6240\u4ee5\u5b83\u81f3\u5c11\u6709\u4e24\u4e2a\u4e09\u5c42\u5730\u5740\u3002<\/p>\n\n\n\n<p>\u4e2d\u95f4\u90a3\u53f0\u4e5f\u662f\u4e00\u6837\u3002<\/p>\n\n\n\n<p>\u53f3\u8fb9\u90a3\u53f0\u66f4\u660e\u663e\uff0c\u5b83\u53ef\u80fd\u8fde\u63a5\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>LAN1<\/li>\n\n\n\n<li>LAN4<\/li>\n\n\n\n<li>LAN5<\/li>\n<\/ul>\n\n\n\n<p>\u90a3\u5b83\u5c31\u4f1a\u6709 3 \u4e2a\u63a5\u53e3\u5730\u5740\u3002<\/p>\n\n\n\n<p>\u6240\u4ee5\u8fd9\u91cc\u4e0d\u662f\u7b80\u5355\u5730\u8bf4\u201c\u4e00\u4e2a\u5185\u90e8\u5730\u5740\u3001\u4e00\u4e2a\u5916\u90e8\u5730\u5740\u201d\uff0c\u800c\u662f\uff1a<\/p>\n\n\n\n<p><strong>\u4e00\u53f0\u8def\u7531\u5668\u6709\u51e0\u4e2a\u4e09\u5c42\u63a5\u53e3\uff0c\u901a\u5e38\u5c31\u6709\u51e0\u4e2a\u4e0d\u540c\u5b50\u7f51\u4e0b\u7684 IP \u5730\u5740\u3002<\/strong><\/p>\n\n\n\n<p>\u8fd9\u4e2a\u548c NAT \u91cc\u7684\u201c\u5185\u7f51\u5730\u5740\/\u5916\u7f51\u5730\u5740\u201d\u4e0d\u662f\u4e00\u56de\u4e8b\uff0c\u8fd9\u91cc\u8003\u7684\u662f\u666e\u901a\u8def\u7531\u4e0e\u5b50\u7f51\u5212\u5206\u3002<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">\u516b\u3001\u7b2c 8 \u9898\u600e\u4e48\u5212\u5206<\/h2>\n\n\n\n<p>\u9898\u76ee\u7ed9\u603b\u5757\uff1a<\/p>\n\n\n\n<p><code>30.138.118.0\/23<\/code><\/p>\n\n\n\n<p><code>\/23<\/code> \u8868\u793a\u603b\u5171 2^(32-23) = 512 \u4e2a\u5730\u5740\u3002<br>\u8303\u56f4\u662f\uff1a<\/p>\n\n\n\n<p><code>30.138.118.0 ~ 30.138.119.255<\/code><\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">1\uff09\u5148\u786e\u5b9a\u6bcf\u4e2a LAN \u81f3\u5c11\u9700\u8981\u591a\u5927\u7684\u5757<\/h3>\n\n\n\n<p>LAN2 \u5230 LAN5 \u7684\u4e3b\u673a\u6570\u5206\u522b\u662f\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>LAN2\uff1a91<\/li>\n\n\n\n<li>LAN3\uff1a150<\/li>\n\n\n\n<li>LAN4\uff1a3<\/li>\n\n\n\n<li>LAN5\uff1a15<\/li>\n<\/ul>\n\n\n\n<p>\u53e6\u5916 LAN1 \u4e5f\u8981\u5206\u5730\u5740\uff0c\u56e0\u4e3a LAN1 \u4e0a\u6302\u4e86 3 \u4e2a\u8def\u7531\u5668\u63a5\u53e3\u3002<\/p>\n\n\n\n<p>\u6240\u4ee5\u53ef\u4ee5\u8fd9\u6837\u7b97\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>\u5c40\u57df\u7f51<\/th><th>\u9700\u8981\u7684\u4e3b\u673a\/\u63a5\u53e3\u6570<\/th><th>\u81f3\u5c11\u9700\u8981\u5730\u5740\u6570<\/th><th>\u5e94\u5206\u914d\u524d\u7f00<\/th><\/tr><\/thead><tbody><tr><td>LAN3<\/td><td>150<\/td><td>\u81f3\u5c11 152<\/td><td><code>\/24<\/code><\/td><\/tr><tr><td>LAN2<\/td><td>91<\/td><td>\u81f3\u5c11 93<\/td><td><code>\/25<\/code><\/td><\/tr><tr><td>LAN5<\/td><td>15<\/td><td>\u81f3\u5c11 17<\/td><td><code>\/27<\/code><\/td><\/tr><tr><td>LAN4<\/td><td>3<\/td><td>\u81f3\u5c11 4 \u6216 5<\/td><td><code>\/29<\/code><\/td><\/tr><tr><td>LAN1<\/td><td>3 \u4e2a\u8def\u7531\u63a5\u53e3<\/td><td>\u81f3\u5c11 5<\/td><td><code>\/29<\/code><\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p>\u8fd9\u91cc\u89e3\u91ca\u4e00\u4e0b\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><code>\/24<\/code> \u6709 256 \u4e2a\u5730\u5740\uff0c254 \u4e2a\u53ef\u7528<\/li>\n\n\n\n<li><code>\/25<\/code> \u6709 128 \u4e2a\u5730\u5740\uff0c126 \u4e2a\u53ef\u7528<\/li>\n\n\n\n<li><code>\/27<\/code> \u6709 32 \u4e2a\u5730\u5740\uff0c30 \u4e2a\u53ef\u7528<\/li>\n\n\n\n<li><code>\/29<\/code> \u6709 8 \u4e2a\u5730\u5740\uff0c6 \u4e2a\u53ef\u7528<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">2\uff09\u6309\u201c\u4ece\u5927\u5230\u5c0f\u201d\u5212\u5206\uff0c\u8fd9\u662f\u53d8\u957f\u5b50\u7f51\u5212\u5206\u7684\u6807\u51c6\u505a\u6cd5<\/h3>\n\n\n\n<p>\u4e00\u79cd\u5b8c\u5168\u6b63\u786e\u7684\u5212\u5206\u65b9\u5f0f\u662f\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>LAN3\uff1a30.138.118.0\/24<\/strong><\/li>\n\n\n\n<li><strong>LAN2\uff1a30.138.119.0\/25<\/strong><\/li>\n\n\n\n<li><strong>LAN5\uff1a30.138.119.128\/27<\/strong><\/li>\n\n\n\n<li><strong>LAN4\uff1a30.138.119.160\/29<\/strong><\/li>\n\n\n\n<li><strong>LAN1\uff1a30.138.119.168\/29<\/strong><\/li>\n<\/ul>\n\n\n\n<p>\u8fd9 5 \u4e2a\u5b50\u7f51\u4e92\u4e0d\u91cd\u53e0\uff0c\u800c\u4e14\u90fd\u5305\u542b\u5728\u603b\u5757 <code>30.138.118.0\/23<\/code> \u91cc\u3002<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">\u4e5d\u3001\u4e3a\u4ec0\u4e48\u8fd9\u79cd\u5212\u5206\u662f\u5bf9\u7684<\/h2>\n\n\n\n<p>\u56e0\u4e3a\u6574\u4e2a <code>\/23<\/code> \u5148\u88ab\u201c\u5207\u5757\u201d\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u5148\u62ff\u4e00\u4e2a <code>\/24<\/code> \u7ed9 LAN3<\/li>\n\n\n\n<li>\u5269\u4e0b\u90e8\u5206\u91cc\u518d\u5207\u4e00\u4e2a <code>\/25<\/code> \u7ed9 LAN2<\/li>\n\n\n\n<li>\u518d\u5207\u4e00\u4e2a <code>\/27<\/code> \u7ed9 LAN5<\/li>\n\n\n\n<li>\u518d\u5207\u4e24\u4e2a <code>\/29<\/code> \u5206\u522b\u7ed9 LAN4 \u548c LAN1<\/li>\n<\/ul>\n\n\n\n<p>\u672c\u8d28\u4e0a\u5c31\u662f\u5728\u4e00\u4e2a\u5927\u5730\u5740\u6c60\u91cc\u505a\u5207\u5206\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u5173\u952e\u70b9<\/h3>\n\n\n\n<p><strong>\u4e0d\u662f LAN1 \u91cc\u518d\u53bb\u5957 LAN2\uff5eLAN5\u3002<\/strong><\/p>\n\n\n\n<p>\u800c\u662f\uff1a<\/p>\n\n\n\n<p><code>30.138.118.0\/23<\/code><br>\u8fd9\u4e2a\u5927\u5757<br>\u2192 \u5207\u6210\u591a\u4e2a\u5e76\u5217\u7684\u5c0f\u5757<br>\u2192 \u5206\u7ed9\u4e0d\u540c LAN<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">\u5341\u3001\u628a\u8fd9\u4e2a\u62d3\u6251\u7528\u4e00\u53e5\u8bdd\u8bf4\u6e05\u695a<\/h2>\n\n\n\n<p>\u5982\u679c\u6309\u8003\u7814\u672f\u8bed\u6765\u8868\u8fbe\uff0c\u8fd9\u9898\u5176\u5b9e\u662f\u5728\u8bf4\uff1a<\/p>\n\n\n\n<p><strong>\u4e00\u4e2a\u81ea\u6cbb\u7cfb\u7edf\u5185\u90e8\u6709 5 \u4e2a\u72ec\u7acb\u7684 IP \u5b50\u7f51\uff0c\u5176\u4e2d LAN1 \u662f\u4e92\u8fde\u5404\u8def\u7531\u5668\u7684\u9aa8\u5e72\u7f51\u6bb5\uff0cLAN2\uff5eLAN5 \u662f\u6302\u5728\u8def\u7531\u5668\u4e0a\u7684\u7528\u6237\u5c40\u57df\u7f51\uff1b\u6574\u4e2a\u81ea\u6cbb\u7cfb\u7edf\u4ece\u4e0a\u7ea7\u83b7\u5f97\u4e00\u4e2a \/23 \u5730\u5740\u5757\uff0c\u518d\u901a\u8fc7 VLSM \u5212\u5206\u7ed9\u5404\u4e2a\u5c40\u57df\u7f51\u3002<\/strong><\/p>\n\n\n\n<p>\u8fd9\u53e5\u8bdd\u4e00\u65e6\u60f3\u901a\uff0cLAN1 \u4e0d\u5305\u542b LAN2\uff5eLAN5 \u5c31\u4e0d\u5947\u602a\u4e86\u3002<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">\u5341\u4e00\u3001\u8fd9\u7c7b\u9898\u6700\u5bb9\u6613\u9519\u5728\u54ea\u91cc<\/h2>\n\n\n\n<p>\u6700\u5e38\u89c1\u7684\u4e09\u4e2a\u8bef\u533a\uff1a<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">1\uff09\u628a\u7269\u7406\u8fde\u63a5\u5173\u7cfb\u8bef\u8ba4\u4e3a IP \u5305\u542b\u5173\u7cfb<\/h3>\n\n\n\n<p>\u56fe\u4e0a LAN2\uff5eLAN5 \u597d\u50cf\u201c\u6302\u5728\u201d LAN1 \u4e0a\uff0c\u4e8e\u662f\u5c31\u8bef\u4ee5\u4e3a LAN1 \u662f\u5b83\u4eec\u7684\u4e0a\u5c42\u7f51\u6bb5\u3002<br>\u8fd9\u662f\u9519\u7684\u3002<\/p>\n\n\n\n<p>\u7269\u7406\u4e0a\u8fde\u63a5\u5728\u4e00\u8d77\uff0c\u4e0d\u4ee3\u8868 IP \u5b50\u7f51\u662f\u5305\u542b\u5173\u7cfb\u3002<br><strong>\u8def\u7531\u5668\u4e00\u9694\u5f00\uff0c\u5c31\u662f\u4e0d\u540c\u5b50\u7f51\u3002<\/strong><\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">2\uff09\u5fd8\u4e86 LAN1 \u4e5f\u9700\u8981\u5730\u5740<\/h3>\n\n\n\n<p>\u5f88\u591a\u4eba\u53ea\u7ed9 LAN2\uff5eLAN5 \u5206\uff0c\u5fd8\u4e86\u4e0b\u65b9\u9aa8\u5e72 LAN1 \u4e5f\u9700\u8981\u4e00\u4e2a\u72ec\u7acb\u7f51\u6bb5\u3002<br>\u8fd9\u662f\u505a\u9898\u65f6\u5f88\u5e38\u89c1\u7684\u6f0f\u9879\u3002<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">3\uff09\u4ee5\u4e3a\u8def\u7531\u5668\u53ea\u6709\u4e00\u4e2a IP<\/h3>\n\n\n\n<p>\u8def\u7531\u5668\u662f\u4e09\u5c42\u8bbe\u5907\uff0c<strong>\u6bcf\u4e2a\u63a5\u53e3\u4e00\u4e2a\u7f51\u6bb5\u3001\u4e00\u4e2a\u5730\u5740<\/strong>\u3002<br>\u6240\u4ee5\u5b83\u5f53\u7136\u53ef\u4ee5\u540c\u65f6\u51fa\u73b0\u5728\u591a\u4e2a\u5b50\u7f51\u91cc\u3002<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">\u5341\u4e8c\u3001\u4ee5\u540e\u78b0\u5230\u7c7b\u4f3c\u9898\u600e\u4e48\u5feb\u901f\u8bc6\u522b<\/h2>\n\n\n\n<p>\u4ee5\u540e\u53ea\u8981\u770b\u5230\u8fd9\u79cd\u56fe\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u4e0b\u65b9\u4e00\u6761\u603b\u7ebf\/\u4e00\u4e2a\u5171\u4eab\u7f51\u6bb5\uff0c\u8fde\u7740\u591a\u4e2a\u8def\u7531\u5668<\/li>\n\n\n\n<li>\u6bcf\u4e2a\u8def\u7531\u5668\u518d\u5f80\u4e0a\u8fde\u4e0d\u540c LAN<\/li>\n<\/ul>\n\n\n\n<p>\u5c31\u8981\u7acb\u523b\u610f\u8bc6\u5230\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\u4e0b\u65b9\u90a3\u6761\u7ebf\u672c\u8eab\u5c31\u662f\u4e00\u4e2a\u5b50\u7f51<\/li>\n\n\n\n<li>\u6bcf\u4e2a\u4e0a\u65b9 LAN \u4e5f\u662f\u4e00\u4e2a\u5b50\u7f51<\/li>\n\n\n\n<li>\u6240\u6709\u8fd9\u4e9b\u5b50\u7f51\u90fd\u662f\u4ece\u603b\u5730\u5740\u5757\u91cc\u5207\u51fa\u6765\u7684<\/li>\n\n\n\n<li>\u5b83\u4eec\u4e4b\u95f4\u662f\u5e76\u5217\uff0c\u4e0d\u662f\u5d4c\u5957<\/li>\n\n\n\n<li>\u4e00\u53f0\u8def\u7531\u5668\u4f1a\u5728\u591a\u4e2a\u5b50\u7f51\u91cc\u5404\u6709\u4e00\u4e2a\u63a5\u53e3\u5730\u5740<\/li>\n<\/ol>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<p>\u5982\u679c\u6309 408 \u505a\u9898\u89d2\u5ea6\u603b\u7ed3\u6210\u6700\u77ed\u8bb0\u5fc6\u7248\uff0c\u5c31\u662f\u8fd9\u4e24\u53e5\uff1a<\/p>\n\n\n\n<p><strong>\u7b2c 7 \u9898\uff1a\u5341\u516d\u8fdb\u5236 CIDR \u4f18\u5148\u6309\u201c1 \u4f4d\u5341\u516d\u8fdb\u5236 = 4 \u4f4d\u4e8c\u8fdb\u5236\u201d\u505a\u524d\u7f00\u5339\u914d\uff0c\u80fd\u4e0d\u8f6c\u5341\u8fdb\u5236\u5c31\u4e0d\u8f6c\u3002<\/strong><br><strong>\u7b2c 8 \u9898\uff1aLAN1 \u4e0d\u662f LAN2\uff5eLAN5 \u7684\u7236\u7f51\uff0c\u800c\u662f 5 \u4e2a\u5e76\u5217\u5b50\u7f51\u4e2d\u7684\u4e00\u4e2a\u9aa8\u5e72\u4e92\u8fde\u7f51\u6bb5\u3002<\/strong><\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='http:\/\/www.preluna.xyz\/wp-content\/uploads\/2026\/04\/1011-768x1024.jpg'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  loading=\"lazy\" decoding=\"async\" width=\"768\" height=\"1024\" data-original=\"http:\/\/www.preluna.xyz\/wp-content\/uploads\/2026\/04\/1011-768x1024.jpg\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\" class=\"wp-image-1982\"  sizes=\"auto, (max-width: 768px) 100vw, 768px\" \/><\/div><\/figure>\n\n\n\n<p>\u8fd9\u4e24\u9898\u786e\u5b9e\u662f 408 \u91cc\u6bd4\u8f83\u201c\u70e6\u201d\u7684\u90a3\u4e00\u7c7b\uff1a\u8868\u9762\u4e0a\u50cf\u662f\u5728\u8003\u4e00\u4e2a IP \u9996\u90e8\uff0c\u5b9e\u9645\u4e0a\u628a\u94fe\u8def\u5c42\u3001\u7f51\u7edc\u5c42\u3001\u5206\u7247\u3001\u957f\u5ea6\u3001\u5730\u5740\u8868\u793a\u6cd5\u3001\u5b57\u6bb5\u504f\u79fb\uff0c\u5168\u63c9\u5728\u4e00\u8d77\u4e86\u3002<br>\u4f46\u8fd9\u7c7b\u9898\u5e76\u4e0d\u662f\u9760\u201c\u786c\u80cc\u4e00\u5927\u4e32\u683c\u5f0f\u201d\u53bb\u505a\uff0c\u800c\u662f\u9760\u201c\u6309\u5b57\u8282\u987a\u5e8f\u673a\u68b0\u62c6\u5b57\u6bb5\u201d\u3002\u4e00\u65e6\u5f62\u6210\u56fa\u5b9a\u6b65\u9aa4\uff0c\u9898\u76ee\u5c31\u4f1a\u7a33\u5b9a\u5f88\u591a\u3002<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">\u7b2c10\u9898\u600e\u4e48\u505a<\/h2>\n\n\n\n<p>\u9898\u76ee\u7ed9\u51fa\u7684 IPv4 \u9996\u90e8\u662f\uff1a<\/p>\n\n\n\n<p><code>45 00 00 54 00 03 58 50 20 06 FF F0 7C 4E 03 02 B4 0E 0F 02<\/code><\/p>\n\n\n\n<p>IPv4 \u6807\u51c6\u9996\u90e8\u6700\u5c11 20B\uff0c\u5b57\u6bb5\u987a\u5e8f\u56fa\u5b9a\uff0c\u6240\u4ee5\u76f4\u63a5\u6309\u987a\u5e8f\u5207\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><code>45<\/code>\uff1a\u7248\u672c + \u9996\u90e8\u957f\u5ea6<\/li>\n\n\n\n<li><code>00<\/code>\uff1a\u533a\u5206\u670d\u52a1<\/li>\n\n\n\n<li><code>00 54<\/code>\uff1a\u603b\u957f\u5ea6<\/li>\n\n\n\n<li><code>00 03<\/code>\uff1a\u6807\u8bc6<\/li>\n\n\n\n<li><code>58 50<\/code>\uff1a\u6807\u5fd7 + \u7247\u504f\u79fb<\/li>\n\n\n\n<li><code>20<\/code>\uff1aTTL<\/li>\n\n\n\n<li><code>06<\/code>\uff1a\u534f\u8bae<\/li>\n\n\n\n<li><code>FF F0<\/code>\uff1a\u9996\u90e8\u6821\u9a8c\u548c<\/li>\n\n\n\n<li><code>7C 4E 03 02<\/code>\uff1a\u6e90 IP<\/li>\n\n\n\n<li><code>B4 0E 0F 02<\/code>\uff1a\u76ee\u7684 IP<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">\u5148\u770b\u6e90 IP \u548c\u76ee\u7684 IP<\/h3>\n\n\n\n<p>\u628a 16 \u8fdb\u5236\u6309\u5b57\u8282\u8f6c\u5341\u8fdb\u5236\uff1a<\/p>\n\n\n\n<p>\u6e90 IP\uff1a<code>7C 4E 03 02<\/code><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><code>7C<\/code> = 124<\/li>\n\n\n\n<li><code>4E<\/code> = 78<\/li>\n\n\n\n<li><code>03<\/code> = 3<\/li>\n\n\n\n<li><code>02<\/code> = 2<\/li>\n<\/ul>\n\n\n\n<p>\u6240\u4ee5\u6e90 IP \u662f <code>124.78.3.2<\/code><\/p>\n\n\n\n<p>\u76ee\u7684 IP\uff1a<code>B4 0E 0F 02<\/code><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><code>B4<\/code> = 180<\/li>\n\n\n\n<li><code>0E<\/code> = 14<\/li>\n\n\n\n<li><code>0F<\/code> = 15<\/li>\n\n\n\n<li><code>02<\/code> = 2<\/li>\n<\/ul>\n\n\n\n<p>\u6240\u4ee5\u76ee\u7684 IP \u662f <code>180.14.15.2<\/code><\/p>\n\n\n\n<p>\u8fd9\u5c31\u662f\u7b2c 1 \u95ee\u7b54\u6848\u3002<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">\u518d\u770b\u6570\u636e\u90e8\u5206\u957f\u5ea6<\/h3>\n\n\n\n<p>\u9996\u5b57\u8282 <code>45<\/code>\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u9ad8 4 \u4f4d <code>4<\/code> \u8868\u793a IPv4<\/li>\n\n\n\n<li>\u4f4e 4 \u4f4d <code>5<\/code> \u8868\u793a\u9996\u90e8\u957f\u5ea6 = 5 \u4e2a 32 \u4f4d\u5b57<\/li>\n\n\n\n<li>\u4e00\u4e2a 32 \u4f4d\u5b57 = 4B<\/li>\n\n\n\n<li>\u6240\u4ee5\u9996\u90e8\u957f\u5ea6 = <code>5 \u00d7 4 = 20B<\/code><\/li>\n<\/ul>\n\n\n\n<p>\u603b\u957f\u5ea6\u5b57\u6bb5\u662f <code>00 54<\/code><\/p>\n\n\n\n<p><code>0x0054 = 84<\/code><\/p>\n\n\n\n<p>\u800c IPv4 \u7684\u201c\u603b\u957f\u5ea6\u201d = \u9996\u90e8 + \u6570\u636e<\/p>\n\n\n\n<p>\u6240\u4ee5\u6570\u636e\u90e8\u5206\u957f\u5ea6\uff1a<\/p>\n\n\n\n<p><code>84 - 20 = 64B<\/code><\/p>\n\n\n\n<p>\u8fd9\u5c31\u662f\u7b2c 2 \u95ee\u7b54\u6848\u3002<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">\u518d\u770b\u662f\u5426\u5206\u7247\u3001\u504f\u79fb\u91cf\u591a\u5c11<\/h3>\n\n\n\n<p>\u5173\u952e\u5b57\u6bb5\u662f <code>58 50<\/code><\/p>\n\n\n\n<p>\u5b83\u662f 16 \u4f4d\uff0c\u5176\u4e2d\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u524d 3 \u4f4d\uff1a\u6807\u5fd7\u4f4d<\/li>\n\n\n\n<li>\u540e 13 \u4f4d\uff1a\u7247\u504f\u79fb<\/li>\n<\/ul>\n\n\n\n<h4 class=\"wp-block-heading\">\u7b2c\u4e00\u6b65\uff1a\u8f6c\u4e8c\u8fdb\u5236\u7406\u89e3\u7ed3\u6784<\/h4>\n\n\n\n<p><code>0x5850<\/code><\/p>\n\n\n\n<p><code>58<\/code> = <code>0101 1000<\/code><br><code>50<\/code> = <code>0101 0000<\/code><\/p>\n\n\n\n<p>\u5408\u8d77\u6765\uff1a<\/p>\n\n\n\n<p><code>0101100001010000<\/code><\/p>\n\n\n\n<p>\u6309\u201c3 \u4f4d\u6807\u5fd7 + 13 \u4f4d\u7247\u504f\u79fb\u201d\u5207\u5f00\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u6807\u5fd7\u4f4d\uff1a<code>010<\/code><\/li>\n\n\n\n<li>\u7247\u504f\u79fb\u5b57\u6bb5\uff1a<code>1100001010000<\/code><\/li>\n<\/ul>\n\n\n\n<h4 class=\"wp-block-heading\">\u7b2c\u4e8c\u6b65\uff1a\u5224\u65ad\u662f\u5426\u5206\u7247<\/h4>\n\n\n\n<p>\u6807\u5fd7\u4f4d <code>010<\/code> \u7684\u542b\u4e49\u662f\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u4fdd\u7559\u4f4d = 0<\/li>\n\n\n\n<li>DF = 1<\/li>\n\n\n\n<li>MF = 0<\/li>\n<\/ul>\n\n\n\n<p>\u518d\u770b\u7247\u504f\u79fb\u5b57\u6bb5\uff1a<\/p>\n\n\n\n<p><code>1100001010000<\/code> = <code>0x1850<\/code> = <code>6224<\/code><\/p>\n\n\n\n<p>\u53ea\u8981\u7247\u504f\u79fb\u4e0d\u4e3a 0\uff0c\u8bf4\u660e\u8fd9\u4e0d\u662f\u7b2c\u4e00\u4e2a\u5206\u7247\uff0c\u5206\u7ec4\u5df2\u7ecf\u53d1\u751f\u8fc7\u5206\u7247\u3002<br>\u53c8\u56e0\u4e3a <code>MF=0<\/code>\uff0c\u8bf4\u660e\u8fd9\u662f<strong>\u6700\u540e\u4e00\u4e2a\u5206\u7247<\/strong>\u3002<\/p>\n\n\n\n<p>\u6240\u4ee5\u4ece\u201c\u673a\u68b0\u89e3\u9898\u201d\u7684\u89d2\u5ea6\uff0c\u8fd9\u4e2a\u5206\u7ec4\u662f<strong>\u5df2\u7ecf\u5206\u7247\u7684<\/strong>\u3002<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">\u7b2c\u4e09\u6b65\uff1a\u504f\u79fb\u91cf\u7684\u5355\u4f4d\u6362\u7b97<\/h4>\n\n\n\n<p>\u8fd9\u91cc\u662f\u6700\u5bb9\u6613\u9519\u7684\u70b9\u3002<\/p>\n\n\n\n<p>IP \u9996\u90e8\u4e2d\u7684\u201c\u7247\u504f\u79fb\u201d\u5b57\u6bb5\uff0c\u5355\u4f4d\u4e0d\u662f\u5b57\u8282\uff0c\u800c\u662f <strong>8B<\/strong>\u3002<\/p>\n\n\n\n<p>\u4e5f\u5c31\u662f\u8bf4\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u7247\u504f\u79fb\u5b57\u6bb5\u503c = <code>6224<\/code><\/li>\n\n\n\n<li>\u5b9e\u9645\u5b57\u8282\u504f\u79fb = <code>6224 \u00d7 8 = 49792B<\/code><\/li>\n<\/ul>\n\n\n\n<p>\u6240\u4ee5\u8fd9\u95ee\u6700\u7a33\u59a5\u7684\u5199\u6cd5\u5e94\u8be5\u662f\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u5df2\u5206\u7247<\/li>\n\n\n\n<li>\u7247\u504f\u79fb\u5b57\u6bb5\u503c\u4e3a <code>6224<\/code><\/li>\n\n\n\n<li>\u82e5\u6362\u7b97\u6210\u5b9e\u9645\u5b57\u8282\u504f\u79fb\u91cf\uff0c\u5219\u4e3a <code>49792B<\/code><\/li>\n<\/ul>\n\n\n\n<h4 class=\"wp-block-heading\">\u8fd9\u91cc\u8981\u7279\u522b\u63d0\u9192\u4e00\u4e2a\u7ec6\u8282<\/h4>\n\n\n\n<p>\u8fd9\u7ec4\u6570\u636e\u91cc\u6709\u4e00\u4e2a\u4e0d\u592a\u534f\u8c03\u7684\u5730\u65b9\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><code>DF=1<\/code> \u8868\u793a\u201c\u4e0d\u5141\u8bb8\u5206\u7247\u201d<\/li>\n\n\n\n<li>\u4f46\u7247\u504f\u79fb\u53c8\u4e0d\u4e3a 0\uff0c\u8bf4\u660e\u5b83\u50cf\u662f\u4e00\u4e2a\u5206\u7247<\/li>\n<\/ul>\n\n\n\n<p>\u4e25\u683c\u6309\u534f\u8bae\u8bed\u4e49\uff0c\u8fd9\u79cd\u7ec4\u5408\u672c\u8eab\u662f\u77db\u76fe\u7684\u3002<br>\u4f46\u8003\u8bd5\u91cc\u8fd9\u79cd\u9898\u901a\u5e38\u9ed8\u8ba4\u201c\u6309\u5b57\u6bb5\u503c\u673a\u68b0\u89e3\u6790\u201d\uff0c\u4e0d\u8981\u81ea\u5df1\u53bb\u6539\u9898\u3002\u4e5f\u5c31\u662f\u8bf4\uff0c\u4ecd\u7136\u6309\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u504f\u79fb\u4e0d\u4e3a 0 \u2192 \u5df2\u5206\u7247<\/li>\n\n\n\n<li><code>MF=0<\/code> \u2192 \u6700\u540e\u4e00\u4e2a\u5206\u7247<\/li>\n<\/ul>\n\n\n\n<p>\u6765\u7b54\u3002<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">\u7b2c10\u9898\u7b54\u6848\u6c47\u603b<\/h2>\n\n\n\n<p>\u7b2c 10 \u9898\u7b54\u6848\u53ef\u4ee5\u76f4\u63a5\u5199\u6210\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\u6e90 IP \u5730\u5740\uff1a<code>124.78.3.2<\/code>\uff0c\u76ee\u7684 IP \u5730\u5740\uff1a<code>180.14.15.2<\/code><\/li>\n\n\n\n<li>\u6570\u636e\u90e8\u5206\u957f\u5ea6\uff1a<code>64B<\/code><\/li>\n\n\n\n<li>\u8be5\u5206\u7ec4\u5df2\u5206\u7247\uff1b\u7247\u504f\u79fb\u5b57\u6bb5\u503c\u4e3a <code>6224<\/code>\uff0c\u5b9e\u9645\u5b57\u8282\u504f\u79fb\u91cf\u4e3a <code>6224 \u00d7 8 = 49792B<\/code>\uff1b\u4e14 <code>MF=0<\/code>\uff0c\u8bf4\u660e\u5b83\u662f\u6700\u540e\u4e00\u4e2a\u5206\u7247<\/li>\n<\/ol>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">\u7b2c11\u9898\u600e\u4e48\u505a<\/h2>\n\n\n\n<p>\u7b2c 11 \u9898\u7ed9\u7684\u662f\u4e00\u5e27\u7684\u524d 64B \u5341\u516d\u8fdb\u5236\u6570\u636e\uff1a<\/p>\n\n\n\n<p><code>00 1d 72 98 1d fc 00 00 5e 00 01 01 88 64 11 00<\/code><br><code>75 89 01 92 00 21 45 00 01 90 f0 bf 40 00 33 06<\/code><br><code>f3 15 da c7 66 28 da cf 3d d3 00 50 c4 8f dc a6<\/code><br><code>a2 96 23 4c 44 69 50 18 00 0f 76 3d 00 00 90 b5<\/code><\/p>\n\n\n\n<p>\u9898\u76ee\u8fd8\u544a\u8bc9\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u4e3b\u673a A \u7684 IP \u5730\u5740\u662f <code>218.207.61.211<\/code><\/li>\n\n\n\n<li>\u4e3b\u673a A \u7684 MAC \u5730\u5740\u662f <code>00:1d:72:98:1d:fc<\/code><\/li>\n<\/ul>\n\n\n\n<p>\u8fd9\u9898\u5173\u952e\u5728\u4e8e\uff1a<br><strong>\u5148\u4ece\u94fe\u8def\u5c42\u770b\uff0c\u518d\u5f80\u7f51\u7edc\u5c42\u5265\u3002<\/strong><\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">\u7b2c\u4e00\u6b65\uff1a\u5148\u770b\u4ee5\u592a\u7f51\u5e27\u5934<\/h3>\n\n\n\n<p>\u4ee5\u592a\u7f51\u5e27\u5934\u524d 14B\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u524d 6B\uff1a\u76ee\u7684 MAC<\/li>\n\n\n\n<li>\u63a5\u7740 6B\uff1a\u6e90 MAC<\/li>\n\n\n\n<li>\u518d 2B\uff1a\u7c7b\u578b<\/li>\n<\/ul>\n\n\n\n<p>\u6240\u4ee5\u524d 14B \u662f\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u76ee\u7684 MAC\uff1a<code>00 1d 72 98 1d fc<\/code><\/li>\n\n\n\n<li>\u6e90 MAC\uff1a<code>00 00 5e 00 01 01<\/code><\/li>\n\n\n\n<li>\u7c7b\u578b\uff1a<code>88 64<\/code><\/li>\n<\/ul>\n\n\n\n<p>\u9898\u76ee\u7ed9\u7684 A \u7684 MAC \u662f <code>00:1d:72:98:1d:fc<\/code>\uff0c\u6b63\u597d\u7b49\u4e8e\u76ee\u7684 MAC\u3002<br>\u8bf4\u660e\u8fd9\u5e27\u662f\u53d1\u7ed9 A \u7684\u3002<\/p>\n\n\n\n<p>\u90a3\u4e48\u8fd9\u4e00\u8df3\u628a\u5e27\u53d1\u7ed9 A \u7684\u90a3\u4e2a\u8bbe\u5907\uff0c\u5c31\u662f A \u6240\u5728\u7f51\u6bb5\u7684\u7f51\u5173\u8def\u7531\u5668\u63a5\u53e3\u3002<br>\u56e0\u6b64\u8be5\u63a5\u53e3\u7684 MAC \u5730\u5740\u5c31\u662f\u5e27\u7684\u6e90 MAC\uff1a<\/p>\n\n\n\n<p><code>00:00:5e:00:01:01<\/code><\/p>\n\n\n\n<p>\u8fd9\u5c31\u662f\u7b2c 1 \u95ee\u7b54\u6848\u3002<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">\u7b2c\u4e8c\u6b65\uff1a\u5224\u65ad\u4ee5\u592a\u7f51\u8d1f\u8f7d\u91cc\u662f\u4ec0\u4e48<\/h3>\n\n\n\n<p>\u7c7b\u578b\u5b57\u6bb5\u662f <code>88 64<\/code>\uff0c\u8fd9\u4e0d\u662f\u666e\u901a IPv4 \u7684 <code>08 00<\/code>\uff0c\u800c\u662f PPPoE Session\u3002<\/p>\n\n\n\n<p>\u63a5\u4e0b\u6765\u51e0\u4e2a\u5b57\u8282\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><code>11 00<\/code><\/li>\n\n\n\n<li><code>75 89<\/code><\/li>\n\n\n\n<li><code>01 92<\/code><\/li>\n\n\n\n<li><code>00 21<\/code><\/li>\n<\/ul>\n\n\n\n<p>\u8fd9\u91cc\u7684 <code>00 21<\/code> \u662f PPP \u534f\u8bae\u5b57\u6bb5\uff0c\u8868\u793a\u91cc\u9762\u5c01\u88c5\u7684\u662f IPv4\u3002<\/p>\n\n\n\n<p>\u6240\u4ee5\u771f\u6b63\u7684 IP \u9996\u90e8\u8981\u4ece <code>45 00<\/code> \u5f00\u59cb\u770b\u3002<\/p>\n\n\n\n<p>\u4e5f\u5c31\u662f\u8bf4\uff0c\u8fd9\u9898\u4e0d\u662f\u201c\u4ee5\u592a\u7f51\u76f4\u63a5\u5c01\u88c5 IP\u201d\uff0c\u800c\u662f\uff1a<\/p>\n\n\n\n<p>\u4ee5\u592a\u7f51 \u2192 PPPoE \u2192 PPP \u2192 IPv4<\/p>\n\n\n\n<p>\u8fd9\u5c31\u662f\u5b83\u770b\u8d77\u6765\u5f88\u8de8\u7ae0\u8282\u7684\u539f\u56e0\u3002<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">\u7b2c\u4e09\u6b65\uff1a\u4ece <code>45 00<\/code> \u5f00\u59cb\u89e3\u6790 IP \u9996\u90e8<\/h3>\n\n\n\n<p>\u4ece <code>45 00<\/code> \u5f00\u59cb\uff1a<\/p>\n\n\n\n<p><code>45 00 01 90 f0 bf 40 00 33 06 f3 15 da c7 66 28 da cf 3d d3<\/code><\/p>\n\n\n\n<p>\u62c6\u5b57\u6bb5\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><code>45<\/code>\uff1aIPv4\uff0c\u9996\u90e8\u957f\u5ea6 5 \u00d7 4 = 20B<\/li>\n\n\n\n<li><code>00<\/code><\/li>\n\n\n\n<li><code>01 90<\/code>\uff1a\u603b\u957f\u5ea6<\/li>\n\n\n\n<li><code>f0 bf<\/code><\/li>\n\n\n\n<li><code>40 00<\/code>\uff1a\u6807\u5fd7 + \u7247\u504f\u79fb<\/li>\n\n\n\n<li><code>33<\/code>\uff1aTTL<\/li>\n\n\n\n<li><code>06<\/code>\uff1aTCP<\/li>\n\n\n\n<li><code>f3 15<\/code><\/li>\n\n\n\n<li><code>da c7 66 28<\/code>\uff1a\u6e90 IP<\/li>\n\n\n\n<li><code>da cf 3d d3<\/code>\uff1a\u76ee\u7684 IP<\/li>\n<\/ul>\n\n\n\n<p>\u5148\u628a\u603b\u957f\u5ea6\u8f6c\u5341\u8fdb\u5236\uff1a<\/p>\n\n\n\n<p><code>0x0190 = 400<\/code><\/p>\n\n\n\n<p>\u9996\u90e8\u957f\u5ea6\u4ecd\u7136\u662f 20B<\/p>\n\n\n\n<p>\u6240\u4ee5 IP \u6570\u636e\u90e8\u5206\u957f\u5ea6\uff1a<\/p>\n\n\n\n<p><code>400 - 20 = 380B<\/code><\/p>\n\n\n\n<p>\u8fd9\u5c31\u662f\u7b2c 2 \u95ee\u7b54\u6848\u3002<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">\u7b2c\u56db\u6b65\uff1a\u5224\u65ad\u8def\u7531\u5668\u4f1a\u4e0d\u4f1a\u5206\u7247<\/h3>\n\n\n\n<p>\u9898\u76ee\u8bf4\uff1a\u82e5\u8be5\u5206\u7ec4\u9700\u8981\u88ab\u8f6c\u53d1\u5230\u4e00\u6761 <code>MTU = 380B<\/code> \u7684\u94fe\u8def\u4e0a\uff0c\u8def\u7531\u5668\u505a\u4ec0\u4e48\uff1f<\/p>\n\n\n\n<p>\u8fd9\u91cc\u6bd4\u8f83\u7684\u662f <strong>IP \u5206\u7ec4\u603b\u957f\u5ea6<\/strong> \u4e0e MTU\u3002<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u5f53\u524d IP \u603b\u957f\u5ea6 = <code>400B<\/code><\/li>\n\n\n\n<li>\u65b0\u94fe\u8def MTU = <code>380B<\/code><\/li>\n<\/ul>\n\n\n\n<p>\u663e\u7136 <code>400 &gt; 380<\/code>\uff0c\u6b63\u5e38\u6765\u8bf4\u8981\u5206\u7247\u3002<\/p>\n\n\n\n<p>\u4f46\u518d\u770b IP \u9996\u90e8\u4e2d\u7684\u6807\u5fd7 + \u7247\u504f\u79fb\u5b57\u6bb5\uff1a<code>40 00<\/code><\/p>\n\n\n\n<p><code>0x4000<\/code> \u7684\u4e8c\u8fdb\u5236\u6700\u9ad8 3 \u4f4d\u662f <code>010<\/code><\/p>\n\n\n\n<p>\u4e5f\u5c31\u662f\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>DF = 1<\/li>\n\n\n\n<li>MF = 0<\/li>\n\n\n\n<li>\u7247\u504f\u79fb = 0<\/li>\n<\/ul>\n\n\n\n<p>\u8fd9\u8868\u793a\uff1a<strong>\u7981\u6b62\u5206\u7247<\/strong><\/p>\n\n\n\n<p>\u6240\u4ee5\u8def\u7531\u5668\u4e0d\u80fd\u5206\u7247\u8f6c\u53d1\uff0c\u53ea\u80fd\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u4e22\u5f03\u8be5 IP \u5206\u7ec4<\/li>\n\n\n\n<li>\u5411\u6e90\u4e3b\u673a\u53d1\u9001 ICMP \u5dee\u9519\u62a5\u6587\uff0c\u8bf4\u660e\u201c\u9700\u8981\u5206\u7247\u4f46 DF \u7f6e 1\u201d<\/li>\n<\/ul>\n\n\n\n<p>\u8fd9\u5c31\u662f\u7b2c 3 \u95ee\u7b54\u6848\u3002<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">\u7b2c11\u9898\u7b54\u6848\u6c47\u603b<\/h2>\n\n\n\n<p>\u7b2c 11 \u9898\u53ef\u4ee5\u76f4\u63a5\u5199\u6210\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\u7f51\u5173\u8def\u7531\u5668\u76f8\u5e94\u7aef\u53e3\u7684 MAC \u5730\u5740\u662f <code>00:00:5e:00:01:01<\/code><\/li>\n\n\n\n<li>IP \u5206\u7ec4\u6240\u643a\u5e26\u7684\u6570\u636e\u91cf\u4e3a <code>380B<\/code><\/li>\n\n\n\n<li>\u56e0\u4e3a\u8be5 IP \u5206\u7ec4\u603b\u957f\u5ea6\u4e3a <code>400B<\/code>\uff0c\u5927\u4e8e\u4e0b\u4e00\u8df3\u94fe\u8def\u7684 <code>MTU=380B<\/code>\uff0c\u672c\u5e94\u5206\u7247\uff1b\u4f46\u9996\u90e8\u4e2d <code>DF=1<\/code>\uff0c\u7981\u6b62\u5206\u7247\uff0c\u6240\u4ee5\u8def\u7531\u5668\u5c06\u4e22\u5f03\u8be5\u5206\u7ec4\uff0c\u5e76\u5411\u6e90\u4e3b\u673a\u53d1\u9001 ICMP \u5dee\u9519\u62a5\u6587<\/li>\n<\/ol>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">\u8fd9\u7c7b\u201c\u94fe\u8def\u5c42 + \u7f51\u7edc\u5c42\u6df7\u5408\u5927\u9898\u201d\u5230\u5e95\u600e\u4e48\u505a<\/h2>\n\n\n\n<p>\u8fd9\u79cd\u9898\u6700\u6015\u7684\u4e0d\u662f\u77e5\u8bc6\u70b9\u591a\uff0c\u800c\u662f\u505a\u9898\u65f6\u987a\u5e8f\u4e71\u3002<br>\u4e00\u4e71\u5c31\u4f1a\u628a\u5b57\u6bb5\u770b\u4e32\uff0c\u628a\u957f\u5ea6\u51cf\u9519\uff0c\u628a\u504f\u79fb\u5355\u4f4d\u5fd8\u6389\u3002<\/p>\n\n\n\n<p>\u6bd4\u8f83\u7a33\u7684\u505a\u6cd5\u5176\u5b9e\u5c31\u56db\u6b65\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u7b2c\u4e00\u6b65\uff1a\u5148\u5224\u65ad\u5f53\u524d\u770b\u5230\u7684\u662f\u54ea\u4e00\u5c42\u7684\u9996\u90e8<\/h3>\n\n\n\n<p>\u89c1\u5230\u4e00\u957f\u4e32\u5341\u516d\u8fdb\u5236\uff0c\u5148\u4e0d\u8981\u6025\u7740\u7b97\u3002\u5148\u95ee\u81ea\u5df1\uff1a<\/p>\n\n\n\n<p>\u73b0\u5728\u8fd9\u4e00\u4e32\uff0c\u662f\u4e0d\u662f\u76f4\u63a5\u5c31\u662f IP \u9996\u90e8\uff1f<\/p>\n\n\n\n<p>\u5982\u679c\u9898\u76ee\u8bf4\u201c\u67d0 IP \u5206\u7ec4\u9996\u90e8\u5982\u4e0b\u201d\uff0c\u90a3\u5c31\u76f4\u63a5\u6309 IPv4 \u9996\u90e8\u683c\u5f0f\u62c6\u3002<br>\u5982\u679c\u9898\u76ee\u8bf4\u201c\u67d0\u4e3b\u673a\u6536\u5230\u4e00\u4e2a\u5e27\uff0c\u524d 64B \u5982\u4e0b\u201d\uff0c\u90a3\u5c31\u5fc5\u987b\u5148\u6309\u94fe\u8def\u5c42\u62c6\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u524d 6B \u76ee\u7684 MAC<\/li>\n\n\n\n<li>\u540e 6B \u6e90 MAC<\/li>\n\n\n\n<li>\u518d 2B \u7c7b\u578b<\/li>\n<\/ul>\n\n\n\n<p>\u53ea\u6709\u5b9a\u4f4d\u5230 IP \u9996\u90e8\u771f\u6b63\u4ece\u54ea\u91cc\u5f00\u59cb\uff0c\u540e\u9762\u624d\u4e0d\u4f1a\u4e71\u3002<\/p>\n\n\n\n<p>\u7b2c 11 \u9898\u5c31\u662f\u5178\u578b\uff1a<br>\u5982\u679c\u4e00\u4e0a\u6765\u628a\u6700\u524d\u9762\u7684 <code>00 1d 72 ...<\/code> \u5f53\u6210 IP \u9996\u90e8\uff0c\u540e\u9762\u5168\u9519\u3002<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">\u7b2c\u4e8c\u6b65\uff1a\u957f\u5ea6\u9898\u4e00\u5f8b\u5148\u6293\u201c\u603b\u957f\u5ea6\u201d\u548c\u201c\u9996\u90e8\u957f\u5ea6\u201d<\/h3>\n\n\n\n<p>IPv4 \u957f\u5ea6\u9898\u7684\u6838\u5fc3\u5c31\u662f\u4e24\u4e2a\u5b57\u6bb5\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u9996\u5b57\u8282\u4f4e 4 \u4f4d \u2192 \u9996\u90e8\u957f\u5ea6<\/li>\n\n\n\n<li>\u603b\u957f\u5ea6\u5b57\u6bb5 \u2192 IP \u5206\u7ec4\u603b\u957f\u5ea6<\/li>\n<\/ul>\n\n\n\n<p>\u7136\u540e\u56fa\u5b9a\u516c\u5f0f\uff1a<\/p>\n\n\n\n<p><code>\u6570\u636e\u957f\u5ea6 = \u603b\u957f\u5ea6 - \u9996\u90e8\u957f\u5ea6<\/code><\/p>\n\n\n\n<p>\u8fd9\u91cc\u7279\u522b\u5bb9\u6613\u548c\u94fe\u8def\u5c42\u957f\u5ea6\u6df7\u6dc6\u3002<br>\u4ee5\u592a\u7f51\u5e27\u957f\u5ea6\u3001IP \u5206\u7ec4\u603b\u957f\u5ea6\u3001IP \u6570\u636e\u90e8\u5206\u957f\u5ea6\uff0c\u8fd9\u4e09\u8005\u4e0d\u662f\u4e00\u56de\u4e8b\u3002<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">\u7b2c\u4e09\u6b65\uff1a\u5206\u7247\u9898\u5fc5\u987b\u5355\u72ec\u76ef\u4f4f\u201c\u6807\u5fd7 + \u7247\u504f\u79fb\u201d16 \u4f4d<\/h3>\n\n\n\n<p>\u65e0\u8bba\u9898\u76ee\u591a\u590d\u6742\uff0c\u5206\u7247\u53ea\u770b\u8fd9 16 \u4f4d\u3002<\/p>\n\n\n\n<p>\u62c6\u6cd5\u56fa\u5b9a\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u524d 3 \u4f4d\uff1a\u6807\u5fd7\u4f4d<\/li>\n\n\n\n<li>\u540e 13 \u4f4d\uff1a\u7247\u504f\u79fb\u5b57\u6bb5<\/li>\n<\/ul>\n\n\n\n<p>\u5224\u65ad\u65f6\u8bb0\u4f4f\u4e09\u53e5\u8bdd\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li><code>\u7247\u504f\u79fb = 0<\/code> \u4e14 <code>MF = 0<\/code>\uff0c\u901a\u5e38\u8868\u793a\u672a\u5206\u7247<\/li>\n\n\n\n<li><code>\u7247\u504f\u79fb \u2260 0<\/code> \u6216 <code>MF = 1<\/code>\uff0c\u5c31\u8bf4\u660e\u548c\u5206\u7247\u6709\u5173<\/li>\n\n\n\n<li>\u7247\u504f\u79fb\u5b57\u6bb5\u7684\u5355\u4f4d\u662f <code>8B<\/code>\uff0c\u4e0d\u662f <code>1B<\/code><\/li>\n<\/ol>\n\n\n\n<p>\u6240\u4ee5\u8003\u8bd5\u91cc\u6700\u7a33\u59a5\u7684\u5199\u6cd5\u4e0d\u662f\u53ea\u5199\u4e00\u4e2a\u6570\uff0c\u800c\u662f\u5199\u53cc\u5c42\u7ed3\u679c\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u7247\u504f\u79fb\u5b57\u6bb5\u503c = \u67d0\u67d0<\/li>\n\n\n\n<li>\u5b9e\u9645\u5b57\u8282\u504f\u79fb = \u67d0\u67d0 \u00d7 8 = \u67d0\u67d0 B<\/li>\n<\/ul>\n\n\n\n<p>\u8fd9\u6837\u51e0\u4e4e\u4e0d\u4f1a\u4e22\u5206\u3002<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">\u7b2c\u56db\u6b65\uff1a\u9047\u5230 MTU\uff0c\u5148\u6bd4\u201cIP \u603b\u957f\u5ea6\u201d\uff0c\u518d\u770b DF<\/h3>\n\n\n\n<p>\u4e00\u770b\u5230 MTU\uff0c\u5c31\u81ea\u52a8\u8fdb\u5165\u8fd9\u4e2a\u5224\u65ad\u6d41\u7a0b\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\u5148\u53d6 IP \u603b\u957f\u5ea6<\/li>\n\n\n\n<li>\u5224\u65ad\u662f\u5426\u5927\u4e8e\u4e0b\u4e00\u8df3\u94fe\u8def MTU<\/li>\n\n\n\n<li>\u82e5\u4e0d\u5927\u4e8e\uff0c\u76f4\u63a5\u8f6c\u53d1<\/li>\n\n\n\n<li>\u82e5\u5927\u4e8e\uff1a\n<ul class=\"wp-block-list\">\n<li>DF = 0 \u2192 \u53ef\u4ee5\u5206\u7247\u540e\u8f6c\u53d1<\/li>\n\n\n\n<li>DF = 1 \u2192 \u4e0d\u80fd\u5206\u7247\uff0c\u53ea\u80fd\u4e22\u5f03\u5e76\u53d1 ICMP \u5dee\u9519\u62a5\u6587<\/li>\n<\/ul>\n<\/li>\n<\/ol>\n\n\n\n<p>\u8fd9\u4e2a\u6d41\u7a0b\u5728\u7b2c 11 \u9898\u91cc\u5c31\u662f\u6807\u51c6\u5e94\u7528\u3002<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">\u8fd9\u7c7b\u9898\u6700\u5bb9\u6613\u9519\u7684\u5730\u65b9<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">1. \u628a\u201c\u7247\u504f\u79fb\u5b57\u6bb5\u503c\u201d\u548c\u201c\u5b9e\u9645\u504f\u79fb\u5b57\u8282\u6570\u201d\u6df7\u4e3a\u4e00\u8c08<\/h3>\n\n\n\n<p>\u8fd9\u662f\u6700\u5e38\u89c1\u9519\u8bef\u3002<\/p>\n\n\n\n<p>\u6bd4\u5982\u7247\u504f\u79fb\u5b57\u6bb5\u662f <code>100<\/code>\uff0c\u5e76\u4e0d\u8868\u793a\u504f\u79fb\u4e86 100B\uff0c<br>\u800c\u662f\u8868\u793a\u504f\u79fb\u4e86 <code>100 \u00d7 8 = 800B<\/code>\u3002<\/p>\n\n\n\n<p>\u6240\u4ee5\u505a\u9898\u65f6\u6700\u597d\u8111\u5b50\u91cc\u59cb\u7ec8\u5206\u6210\u4e24\u5c42\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u5b57\u6bb5\u5b58\u7684\u503c<\/li>\n\n\n\n<li>\u5b9e\u9645\u5b57\u8282\u504f\u79fb\u91cf<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">2. \u628a IP \u603b\u957f\u5ea6\u548c\u6570\u636e\u957f\u5ea6\u6df7\u6dc6<\/h3>\n\n\n\n<p><code>\u603b\u957f\u5ea6<\/code> \u5305\u542b\u9996\u90e8\u3002<br>\u5f88\u591a\u9898\u4e00\u770b\u5230 <code>0x0190 = 400<\/code> \u5c31\u76f4\u63a5\u5199\u201c\u6570\u636e\u957f\u5ea6 400B\u201d\uff0c\u8fd9\u662f\u9519\u7684\u3002<\/p>\n\n\n\n<p>\u5fc5\u987b\u51cf\u53bb IP \u9996\u90e8\u957f\u5ea6\u3002<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">3. \u5728\u201c\u5e27\u201d\u91cc\u76f4\u63a5\u627e IP \u5730\u5740\uff0c\u6ca1\u6709\u5148\u8fc7 MAC \u548c\u7c7b\u578b\u5b57\u6bb5<\/h3>\n\n\n\n<p>\u8fd9\u79cd\u9519\u5728\u8de8\u5c42\u9898\u91cc\u7279\u522b\u591a\u3002<\/p>\n\n\n\n<p>\u9898\u76ee\u4e00\u8bf4\u201c\u6536\u5230\u4e00\u4e2a\u5e27\u201d\uff0c\u7b2c\u4e00\u53cd\u5e94\u5fc5\u987b\u662f\uff1a<\/p>\n\n\n\n<p>\u5148\u770b\u76ee\u7684 MAC\u3001\u6e90 MAC\u3001\u7c7b\u578b\u5b57\u6bb5\u3002<br>\u53ea\u6709\u627e\u5230\u7f51\u7edc\u5c42\u62a5\u6587\u771f\u6b63\u4ece\u54ea\u91cc\u5f00\u59cb\uff0c\u540e\u9762\u624d\u6709\u610f\u4e49\u3002<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">4. \u770b\u5230 DF=1 \u5c31\u76f4\u63a5\u8bf4\u201c\u672a\u5206\u7247\u201d<\/h3>\n\n\n\n<p>\u8fd9\u4e5f\u4e0d\u5bf9\u3002<\/p>\n\n\n\n<p>DF \u7684\u610f\u601d\u662f\u201c\u4e0d\u5141\u8bb8\u7ee7\u7eed\u5206\u7247\u201d\uff0c<br>\u5b83\u4e0d\u7b49\u4e8e\u201c\u5f53\u524d\u8fd9\u4e2a\u62a5\u6587\u4e00\u5b9a\u4e0d\u662f\u67d0\u4e2a\u5206\u7247\u201d\u3002<\/p>\n\n\n\n<p>\u4e25\u683c\u505a\u9898\u8fd8\u662f\u8981\u7ed3\u5408\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>DF<\/li>\n\n\n\n<li>MF<\/li>\n\n\n\n<li>\u7247\u504f\u79fb<\/li>\n<\/ul>\n\n\n\n<p>\u4e00\u8d77\u5224\u65ad\u3002<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">\u5efa\u8bae\u8bb0\u4f4f\u7684\u4e00\u4e2a\u56fa\u5b9a\u505a\u9898\u6a21\u677f<\/h2>\n\n\n\n<p>\u4ee5\u540e\u9047\u5230\u8fd9\u79cd\u5341\u516d\u8fdb\u5236\u62a5\u6587\u9898\uff0c\u76f4\u63a5\u5957\u8fd9\u4e2a\u987a\u5e8f\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\u5148\u5224\u65ad\u7ed9\u7684\u662f\u5e27\u8fd8\u662f IP \u9996\u90e8<\/li>\n\n\n\n<li>\u5982\u679c\u662f\u5e27\uff0c\u5148\u62c6 MAC \u548c\u7c7b\u578b\u5b57\u6bb5<\/li>\n\n\n\n<li>\u627e\u5230 IP \u9996\u90e8\u8d77\u70b9\u540e\uff0c\u770b <code>\u7248\u672c\/IHL<\/code><\/li>\n\n\n\n<li>\u7528\u603b\u957f\u5ea6\u548c\u9996\u90e8\u957f\u5ea6\u6c42\u6570\u636e\u957f\u5ea6<\/li>\n\n\n\n<li>\u770b <code>\u6807\u5fd7 + \u7247\u504f\u79fb<\/code> \u5224\u65ad\u662f\u5426\u5206\u7247<\/li>\n\n\n\n<li>\u7247\u504f\u79fb\u8bb0\u5f97\u4e58 <code>8B<\/code> \u624d\u662f\u5b9e\u9645\u5b57\u8282\u504f\u79fb<\/li>\n\n\n\n<li>\u5982\u679c\u95ee MTU\uff0c\u5c31\u6bd4\u8f83 IP \u603b\u957f\u5ea6\u548c MTU\uff0c\u518d\u770b DF<\/li>\n<\/ol>\n\n\n\n<p>\u8fd9\u5957\u6d41\u7a0b\u4e00\u65e6\u719f\u4e86\uff0c\u9898\u76ee\u518d\u957f\uff0c\u672c\u8d28\u4e0a\u4e5f\u53ea\u662f\u201c\u6309\u56fa\u5b9a\u504f\u79fb\u8bfb\u5b57\u6bb5\u201d\u3002<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">IPv4 \u9996\u90e8\u5341\u516d\u8fdb\u5236\u62a5\u6587\u9898\u901f\u89e3\u6a21\u677f<\/h2>\n\n\n\n<p>\u8fd9\u7c7b\u9898\u8868\u9762\u4e0a\u662f\u5728\u8003\u201c\u4f1a\u4e0d\u4f1a\u770b\u5341\u516d\u8fdb\u5236\u201d\uff0c\u672c\u8d28\u4e0a\u8003\u7684\u662f\uff1a\u80fd\u4e0d\u80fd\u628a IPv4 \u9996\u90e8\u683c\u5f0f\u6309\u5b57\u8282\u987a\u5e8f\u673a\u68b0\u62c6\u5f00\u3002\u53ea\u8981\u987a\u5e8f\u7a33\u5b9a\uff0c\u8fd9\u7c7b\u9898\u5176\u5b9e\u975e\u5e38\u9002\u5408\u62ff\u5206\u3002\u771f\u6b63\u5bb9\u6613\u5931\u5206\u7684\uff0c\u4e0d\u662f\u4e0d\u4f1a\uff0c\u800c\u662f\u505a\u9898\u65f6\u5b57\u6bb5\u770b\u4e71\u4e86\u3001\u5355\u4f4d\u5fd8\u4e86\u3001\u957f\u5ea6\u51cf\u9519\u4e86\u3002<\/p>\n\n\n\n<p>\u5e73\u65f6\u6574\u7406\u65f6\uff0c\u6211\u66f4\u503e\u5411\u4e8e\u628a\u5b83\u5f53\u6210\u4e00\u4e2a\u56fa\u5b9a\u6d41\u7a0b\uff0c\u800c\u4e0d\u662f\u96f6\u6563\u77e5\u8bc6\u70b9\u53bb\u80cc\u3002\u8003\u8bd5\u91cc\u62ff\u5230\u4e00\u4e32 IPv4 \u9996\u90e8\u5341\u516d\u8fdb\u5236\u6570\u636e\uff0c\u5148\u4e0d\u8981\u6025\u7740\u9010\u5b57\u8282\u786c\u7ffb\u8bd1\uff0c\u800c\u662f\u5148\u6309\u6807\u51c6\u9996\u90e8\u7ed3\u6784\u5207\u5b57\u6bb5\u3002IPv4 \u6700\u5c0f\u9996\u90e8\u957f\u5ea6\u662f 20B\uff0c\u4e5f\u5c31\u662f\u524d 20 \u4e2a\u5b57\u8282\u4e00\u5b9a\u53ef\u4ee5\u5148\u6309\u4e0b\u9762\u7684\u987a\u5e8f\u8bfb\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>\u7b2c1\u5b57\u8282\uff1a\u7248\u672c + \u9996\u90e8\u957f\u5ea6\n\u7b2c2\u5b57\u8282\uff1a\u533a\u5206\u670d\u52a1\n\u7b2c3~4\u5b57\u8282\uff1a\u603b\u957f\u5ea6\n\u7b2c5~6\u5b57\u8282\uff1a\u6807\u8bc6\n\u7b2c7~8\u5b57\u8282\uff1a\u6807\u5fd7 + \u7247\u504f\u79fb\n\u7b2c9\u5b57\u8282\uff1aTTL\n\u7b2c10\u5b57\u8282\uff1a\u534f\u8bae\n\u7b2c11~12\u5b57\u8282\uff1a\u9996\u90e8\u6821\u9a8c\u548c\n\u7b2c13~16\u5b57\u8282\uff1a\u6e90IP\u5730\u5740\n\u7b2c17~20\u5b57\u8282\uff1a\u76ee\u7684IP\u5730\u5740\n<\/code><\/pre>\n\n\n\n<p>\u5982\u679c\u9898\u76ee\u660e\u786e\u8bf4\u201c\u7ed9\u51fa\u7684\u662f IPv4 \u5206\u7ec4\u9996\u90e8\u201d\uff0c\u90a3\u5c31\u76f4\u63a5\u4ece\u8fd9\u91cc\u5f00\u59cb\u62c6\u3002\u82e5\u9898\u76ee\u7ed9\u7684\u662f\u201c\u67d0\u5e27\u7684\u524d\u82e5\u5e72\u5b57\u8282\u201d\uff0c\u5c31\u4e0d\u80fd\u4e00\u4e0a\u6765\u76f4\u63a5\u6309 IPv4 \u9996\u90e8\u5957\uff0c\u800c\u8981\u5148\u770b\u94fe\u8def\u5c42\u5934\u90e8\uff0c\u628a IP \u9996\u90e8\u771f\u6b63\u7684\u8d77\u70b9\u627e\u51fa\u6765\u3002\u8fd9\u4e00\u70b9\u5728\u8de8\u7ae0\u8282\u9898\u91cc\u975e\u5e38\u5173\u952e\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u4e00\u3001\u5148\u505a\u7684\u7b2c\u4e00\u4ef6\u4e8b\uff1a\u770b\u7b2c 1 \u4e2a\u5b57\u8282<\/h3>\n\n\n\n<p>\u9996\u5b57\u8282\u6700\u91cd\u8981\uff0c\u56e0\u4e3a\u5b83\u4e00\u4e0b\u5c31\u628a\u4e24\u4e2a\u9ad8\u9891\u8003\u70b9\u90fd\u5b9a\u4e0b\u6765\u4e86\u3002<\/p>\n\n\n\n<p>\u4f8b\u5982\u9996\u5b57\u8282\u662f <code>45<\/code>\uff0c\u5c31\u62c6\u6210\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u9ad8 4 \u4f4d\uff1a<code>4<\/code>\uff0c\u8868\u793a IPv4<\/li>\n\n\n\n<li>\u4f4e 4 \u4f4d\uff1a<code>5<\/code>\uff0c\u8868\u793a\u9996\u90e8\u957f\u5ea6\u662f 5 \u4e2a 32 \u4f4d\u5b57<\/li>\n<\/ul>\n\n\n\n<p>\u800c 1 \u4e2a 32 \u4f4d\u5b57 = 4B\uff0c\u6240\u4ee5\u9996\u90e8\u957f\u5ea6\u5c31\u662f\uff1a<\/p>\n\n\n\n<p><code>5 \u00d7 4 = 20B<\/code><\/p>\n\n\n\n<p>\u8fd9\u4e00\u6b65\u975e\u5e38\u5173\u952e\uff0c\u56e0\u4e3a\u540e\u9762\u6c42\u6570\u636e\u90e8\u5206\u957f\u5ea6\u3001\u5224\u65ad\u6709\u6ca1\u6709\u9009\u9879\u5b57\u6bb5\uff0c\u5168\u90e8\u4f9d\u8d56\u5b83\u3002<\/p>\n\n\n\n<p>\u4e5f\u5c31\u662f\u8bf4\uff0c\u770b\u5230 <code>45<\/code>\uff0c\u8111\u5b50\u91cc\u8981\u7acb\u523b\u5f62\u6210\u4e24\u4e2a\u7ed3\u8bba\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u8fd9\u662f IPv4<\/li>\n\n\n\n<li>\u9996\u90e8\u957f\u5ea6 20B\uff0c\u6ca1\u6709\u9009\u9879\u5b57\u6bb5<\/li>\n<\/ul>\n\n\n\n<p>\u82e5\u4f4e 4 \u4f4d\u4e0d\u662f 5\uff0c\u6bd4\u5982\u662f 6\u30017\uff0c\u5219\u8bf4\u660e\u9996\u90e8\u957f\u5ea6\u5206\u522b\u662f 24B\u300128B\uff0c\u8bf4\u660e\u9996\u90e8\u91cc\u5e26\u4e86\u9009\u9879\u5b57\u6bb5\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u4e8c\u3001\u957f\u5ea6\u7c7b\u9898\u53ea\u6293\u4e24\u4e2a\u91cf<\/h3>\n\n\n\n<p>IPv4 \u4e2d\u548c\u957f\u5ea6\u6709\u5173\uff0c\u6700\u5e38\u8003\u7684\u5c31\u662f\u4e24\u4e2a\u5b57\u6bb5\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u9996\u90e8\u957f\u5ea6<\/li>\n\n\n\n<li>\u603b\u957f\u5ea6<\/li>\n<\/ul>\n\n\n\n<p>\u603b\u957f\u5ea6\u5b57\u6bb5\u662f\u7b2c 3~4 \u5b57\u8282\uff0c\u8868\u793a\u6574\u4e2a IP \u5206\u7ec4\u957f\u5ea6\uff0c\u4e5f\u5c31\u662f\uff1a<\/p>\n\n\n\n<p><code>\u603b\u957f\u5ea6 = \u9996\u90e8 + \u6570\u636e<\/code><\/p>\n\n\n\n<p>\u56e0\u6b64\u53ea\u8981\u9898\u76ee\u95ee\u201c\u6570\u636e\u90e8\u5206\u957f\u5ea6\u201d\u201cIP \u5206\u7ec4\u643a\u5e26\u7684\u6570\u636e\u91cf\u201d\u201c\u51c0\u8377\u957f\u5ea6\u201d\uff0c\u7edf\u4e00\u90fd\u7528\uff1a<\/p>\n\n\n\n<p><code>\u6570\u636e\u957f\u5ea6 = \u603b\u957f\u5ea6 - \u9996\u90e8\u957f\u5ea6<\/code><\/p>\n\n\n\n<p>\u4f8b\u5982\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u9996\u90e8\u957f\u5ea6 = 20B<\/li>\n\n\n\n<li>\u603b\u957f\u5ea6 = <code>0x0054 = 84<\/code><\/li>\n<\/ul>\n\n\n\n<p>\u90a3\u4e48\u6570\u636e\u957f\u5ea6\u5c31\u662f\uff1a<\/p>\n\n\n\n<p><code>84 - 20 = 64B<\/code><\/p>\n\n\n\n<p>\u8fd9\u7c7b\u9898\u6700\u5bb9\u6613\u9519\u7684\u5730\u65b9\uff0c\u662f\u628a\u201c\u603b\u957f\u5ea6\u201d\u76f4\u63a5\u5f53\u6210\u201c\u6570\u636e\u957f\u5ea6\u201d\uff0c\u6216\u8005\u628a\u94fe\u8def\u5c42\u5e27\u957f\u548c IP \u603b\u957f\u5ea6\u6df7\u5728\u4e00\u8d77\u3002\u8981\u8bb0\u4f4f\uff0cIPv4 \u9996\u90e8\u91cc\u7684\u603b\u957f\u5ea6\u53ea\u7ba1 IPv4 \u5206\u7ec4\u672c\u8eab\uff0c\u4e0d\u7ba1\u4ee5\u592a\u7f51\u9996\u90e8\uff0c\u4e5f\u4e0d\u7ba1\u5e27\u5c3e FCS\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u4e09\u3001\u5730\u5740\u7c7b\u9898\u6700\u673a\u68b0\uff0c\u4e5f\u6700\u5bb9\u6613\u767d\u767d\u5931\u5206<\/h3>\n\n\n\n<p>\u6e90 IP \u5730\u5740\u56fa\u5b9a\u662f\u7b2c 13~16 \u5b57\u8282\uff0c\u76ee\u7684 IP \u5730\u5740\u56fa\u5b9a\u662f\u7b2c 17~20 \u5b57\u8282\u3002<br>\u505a\u6cd5\u975e\u5e38\u673a\u68b0\uff1a\u6bcf\u4e2a\u5b57\u8282\u5355\u72ec\u8f6c\u6210\u5341\u8fdb\u5236\uff0c\u518d\u7528\u70b9\u53f7\u8fde\u63a5\u3002<\/p>\n\n\n\n<p>\u6bd4\u5982\uff1a<\/p>\n\n\n\n<p><code>7C 4E 03 02<\/code><\/p>\n\n\n\n<p>\u8f6c\u6362\u65f6\u4e0d\u8981\u6574\u6bb5\u4e00\u8d77\u7b97\uff0c\u53ea\u6309\u5b57\u8282\u62c6\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><code>7C<\/code> = 124<\/li>\n\n\n\n<li><code>4E<\/code> = 78<\/li>\n\n\n\n<li><code>03<\/code> = 3<\/li>\n\n\n\n<li><code>02<\/code> = 2<\/li>\n<\/ul>\n\n\n\n<p>\u6240\u4ee5\u5730\u5740\u5c31\u662f\uff1a<\/p>\n\n\n\n<p><code>124.78.3.2<\/code><\/p>\n\n\n\n<p>\u76ee\u7684 IP \u540c\u7406\u3002<br>\u8fd9\u79cd\u9898\u672c\u8d28\u4e0a\u6ca1\u6709\u601d\u7ef4\u96be\u5ea6\uff0c\u53ea\u6709\u7ec6\u5fc3\u7a0b\u5ea6\uff0c\u6700\u597d\u7684\u4e60\u60ef\u5c31\u662f\u201c\u4e00\u5b57\u8282\u4e00\u5b57\u8282\u5730\u6362\u201d\uff0c\u4e0d\u8981\u56fe\u5feb\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u56db\u3001\u5206\u7247\u9898\u4e00\u5b9a\u76ef\u4f4f\u201c\u7b2c 7~8 \u5b57\u8282\u201d<\/h3>\n\n\n\n<p>\u5206\u7247\u76f8\u5173\u7684\u6240\u6709\u5224\u65ad\uff0c\u6838\u5fc3\u90fd\u5728\u8fd9 16 \u4f4d\u91cc\u3002\u8fd9\u4e2a\u5b57\u6bb5\u7531\u4e24\u90e8\u5206\u7ec4\u6210\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u524d 3 \u4f4d\uff1a\u6807\u5fd7\u4f4d<\/li>\n\n\n\n<li>\u540e 13 \u4f4d\uff1a\u7247\u504f\u79fb<\/li>\n<\/ul>\n\n\n\n<p>\u4e5f\u5c31\u662f\u8bf4\uff0c\u62ff\u5230\u8fd9\u4e24\u4e2a\u5b57\u8282\u540e\uff0c\u7b2c\u4e00\u53cd\u5e94\u4e0d\u662f\u76f4\u63a5\u7b97\u5341\u8fdb\u5236\uff0c\u800c\u662f\u5148\u610f\u8bc6\u5230\u5b83\u8981\u62c6\u6210\u201c3 + 13\u201d\u7684\u7ed3\u6784\u3002<\/p>\n\n\n\n<p>\u4e09\u4e2a\u6807\u5fd7\u4f4d\u4e2d\uff0c\u6700\u5e38\u7528\u7684\u662f\u540e\u4e24\u4e2a\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>DF\uff1a\u662f\u5426\u5141\u8bb8\u5206\u7247<\/li>\n\n\n\n<li>MF\uff1a\u540e\u9762\u662f\u5426\u8fd8\u6709\u5206\u7247<\/li>\n<\/ul>\n\n\n\n<p>\u5176\u4e2d\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><code>DF = 1<\/code> \u8868\u793a\u4e0d\u5141\u8bb8\u5206\u7247<\/li>\n\n\n\n<li><code>MF = 1<\/code> \u8868\u793a\u540e\u9762\u8fd8\u6709\u5206\u7247<\/li>\n\n\n\n<li><code>MF = 0<\/code> \u8868\u793a\u8fd9\u5df2\u7ecf\u662f\u6700\u540e\u4e00\u4e2a\u5206\u7247\uff0c\u6216\u8005\u6839\u672c\u6ca1\u5206\u7247<\/li>\n<\/ul>\n\n\n\n<p>\u4f46\u8003\u8bd5\u91cc\u771f\u6b63\u5bb9\u6613\u51fa\u9519\u7684\uff0c\u4e0d\u662f DF \u548c MF\uff0c\u800c\u662f\u201c\u7247\u504f\u79fb\u7684\u5355\u4f4d\u201d\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u4e94\u3001\u7247\u504f\u79fb\u5b57\u6bb5\u7684\u5355\u4f4d\u4e0d\u662f\u5b57\u8282\uff0c\u800c\u662f 8B<\/h3>\n\n\n\n<p>\u8fd9\u662f\u5206\u7247\u9898\u7684\u5934\u53f7\u9677\u9631\uff0c\u51e0\u4e4e\u6bcf\u5e74\u90fd\u6709\u4eba\u5728\u8fd9\u91cc\u51fa\u9519\u3002<\/p>\n\n\n\n<p>IP \u9996\u90e8\u4e2d\u7684\u7247\u504f\u79fb\u5b57\u6bb5\uff0c\u8868\u793a\u7684\u662f\u201c\u5f53\u524d\u5206\u7247\u6570\u636e\u90e8\u5206\u76f8\u5bf9\u4e8e\u539f\u59cb\u6570\u636e\u90e8\u5206\u8d77\u70b9\u7684\u504f\u79fb\u91cf\u201d\uff0c\u4f46\u5b83\u5b58\u7684\u4e0d\u662f\u5b57\u8282\u6570\uff0c\u800c\u662f\u4ee5 8B \u4e3a\u5355\u4f4d\u7684\u6570\u503c\u3002<\/p>\n\n\n\n<p>\u4e5f\u5c31\u662f\u8bf4\uff1a<\/p>\n\n\n\n<p><code>\u5b9e\u9645\u5b57\u8282\u504f\u79fb = \u7247\u504f\u79fb\u5b57\u6bb5\u503c \u00d7 8<\/code><\/p>\n\n\n\n<p>\u4f8b\u5982\u67d0\u9898\u4e2d\u7b2c 7~8 \u5b57\u8282\u89e3\u6790\u540e\uff0c\u7247\u504f\u79fb\u5b57\u6bb5\u503c\u4e3a <code>6224<\/code>\uff0c\u90a3\u4e48\u771f\u6b63\u7684\u5b57\u8282\u504f\u79fb\u91cf\u5e94\u8be5\u5199\u6210\uff1a<\/p>\n\n\n\n<p><code>6224 \u00d7 8 = 49792B<\/code><\/p>\n\n\n\n<p>\u56e0\u6b64\uff0c\u51e1\u662f\u9898\u76ee\u95ee\u201c\u504f\u79fb\u91cf\u662f\u591a\u5c11\u201d\uff0c\u6700\u7a33\u7684\u5199\u6cd5\u90fd\u4e0d\u662f\u53ea\u5199\u4e00\u4e2a\u6570\u5b57\uff0c\u800c\u662f\u5199\u53cc\u5c42\u7ed3\u8bba\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u7247\u504f\u79fb\u5b57\u6bb5\u503c\u4e3a <code>6224<\/code><\/li>\n\n\n\n<li>\u5b9e\u9645\u5b57\u8282\u504f\u79fb\u91cf\u4e3a <code>49792B<\/code><\/li>\n<\/ul>\n\n\n\n<p>\u8fd9\u6837\u57fa\u672c\u4e0d\u4f1a\u56e0\u4e3a\u5355\u4f4d\u95ee\u9898\u4e22\u5206\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u516d\u3001\u5982\u4f55\u5feb\u901f\u5224\u65ad\u201c\u662f\u5426\u5df2\u7ecf\u5206\u7247\u201d<\/h3>\n\n\n\n<p>\u8fd9\u4e2a\u95ee\u9898\u5728\u9898\u91cc\u51fa\u73b0\u9891\u7387\u5f88\u9ad8\uff0c\u5224\u65ad\u903b\u8f91\u5176\u5b9e\u5e76\u4e0d\u590d\u6742\u3002<\/p>\n\n\n\n<p>\u901a\u5e38\u53ef\u4ee5\u8fd9\u6837\u628a\u63e1\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u5982\u679c <code>\u7247\u504f\u79fb = 0<\/code> \u4e14 <code>MF = 0<\/code>\uff0c\u4e00\u822c\u8bf4\u660e\u672a\u5206\u7247<\/li>\n\n\n\n<li>\u5982\u679c <code>\u7247\u504f\u79fb \u2260 0<\/code>\uff0c\u8bf4\u660e\u5b83\u4e00\u5b9a\u4e0d\u662f\u7b2c\u4e00\u4e2a\u5206\u7247\uff0c\u5df2\u7ecf\u5904\u4e8e\u5206\u7247\u72b6\u6001<\/li>\n\n\n\n<li>\u5982\u679c <code>MF = 1<\/code>\uff0c\u8bf4\u660e\u540e\u9762\u8fd8\u6709\u5206\u7247\uff0c\u4e5f\u8bf4\u660e\u53d1\u751f\u4e86\u5206\u7247<\/li>\n<\/ul>\n\n\n\n<p>\u4e5f\u5c31\u662f\u8bf4\uff0c\u53ea\u8981\u51fa\u73b0\u4e0b\u9762\u4efb\u4e00\u79cd\u60c5\u51b5\uff0c\u901a\u5e38\u90fd\u53ef\u4ee5\u8ba4\u5b9a\u201c\u548c\u5206\u7247\u6709\u5173\u201d\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><code>\u7247\u504f\u79fb \u2260 0<\/code><\/li>\n\n\n\n<li><code>MF = 1<\/code><\/li>\n<\/ul>\n\n\n\n<p>\u5982\u679c\u8fd8\u8981\u8fdb\u4e00\u6b65\u5224\u65ad\u5b83\u662f\u7b2c\u51e0\u4e2a\u5206\u7247\uff0c\u53ef\u4ee5\u8fd9\u6837\u7406\u89e3\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><code>\u7247\u504f\u79fb = 0<\/code> \u4e14 <code>MF = 1<\/code>\uff1a\u7b2c\u4e00\u4e2a\u5206\u7247<\/li>\n\n\n\n<li><code>\u7247\u504f\u79fb \u2260 0<\/code> \u4e14 <code>MF = 1<\/code>\uff1a\u4e2d\u95f4\u5206\u7247<\/li>\n\n\n\n<li><code>\u7247\u504f\u79fb \u2260 0<\/code> \u4e14 <code>MF = 0<\/code>\uff1a\u6700\u540e\u4e00\u4e2a\u5206\u7247<\/li>\n<\/ul>\n\n\n\n<p>\u8fd9\u662f\u5f88\u5178\u578b\u7684 408 \u8003\u6cd5\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u4e03\u3001\u9047\u5230 MTU \u9898\uff0c\u56fa\u5b9a\u6309\u4e00\u4e2a\u6d41\u7a0b\u8d70<\/h3>\n\n\n\n<p>\u53ea\u8981\u9898\u76ee\u91cc\u51fa\u73b0\u4e86 MTU\uff0c\u57fa\u672c\u5c31\u662f\u5728\u8003\u201c\u8def\u7531\u5668\u662f\u5426\u9700\u8981\u5206\u7247\uff0c\u4ee5\u53ca\u80fd\u4e0d\u80fd\u5206\u7247\u201d\u3002<\/p>\n\n\n\n<p>\u8fd9\u91cc\u4e0d\u8981\u53d1\u6563\uff0c\u56fa\u5b9a\u6309\u4e0b\u9762\u7684\u987a\u5e8f\u5224\u65ad\uff1a<\/p>\n\n\n\n<p>\u5148\u6bd4 IP \u5206\u7ec4\u603b\u957f\u5ea6\u548c MTU \u7684\u5927\u5c0f\u3002<\/p>\n\n\n\n<p>\u5982\u679c\uff1a<\/p>\n\n\n\n<p><code>IP \u603b\u957f\u5ea6 \u2264 MTU<\/code><\/p>\n\n\n\n<p>\u90a3\u4e48\u53ef\u4ee5\u76f4\u63a5\u8f6c\u53d1\uff0c\u4e0d\u9700\u8981\u5206\u7247\u3002<\/p>\n\n\n\n<p>\u5982\u679c\uff1a<\/p>\n\n\n\n<p><code>IP \u603b\u957f\u5ea6 &gt; MTU<\/code><\/p>\n\n\n\n<p>\u90a3\u4e48\u539f\u5219\u4e0a\u9700\u8981\u5206\u7247\u3002\u63a5\u7740\u518d\u770b DF \u4f4d\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><code>DF = 0<\/code>\uff1a\u5141\u8bb8\u5206\u7247\uff0c\u8def\u7531\u5668\u53ef\u4ee5\u5206\u7247\u540e\u8f6c\u53d1<\/li>\n\n\n\n<li><code>DF = 1<\/code>\uff1a\u4e0d\u5141\u8bb8\u5206\u7247\uff0c\u8def\u7531\u5668\u4e0d\u80fd\u8f6c\u53d1\u8be5\u5206\u7ec4\uff0c\u53ea\u80fd\u4e22\u5f03\uff0c\u5e76\u5411\u6e90\u4e3b\u673a\u53d1\u9001 ICMP \u5dee\u9519\u62a5\u6587<\/li>\n<\/ul>\n\n\n\n<p>\u8fd9\u91cc\u5fc5\u987b\u6ce8\u610f\uff0c\u6bd4\u8f83\u7684\u662f <strong>IP \u603b\u957f\u5ea6<\/strong> \u548c <strong>MTU<\/strong>\uff0c\u4e0d\u662f IP \u6570\u636e\u957f\u5ea6\uff0c\u4e5f\u4e0d\u662f\u94fe\u8def\u5c42\u5e27\u957f\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u516b\u3001\u771f\u6b63\u505a\u9898\u65f6\u7684\u5b8c\u6574\u901f\u89e3\u6d41\u7a0b<\/h3>\n\n\n\n<p>\u8003\u8bd5\u91cc\u62ff\u5230\u4e00\u9053 IPv4 \u9996\u90e8\u5341\u516d\u8fdb\u5236\u9898\uff0c\u6211\u66f4\u5efa\u8bae\u76f4\u63a5\u5957\u4e0b\u9762\u8fd9\u4e2a\u505a\u9898\u987a\u5e8f\uff1a<\/p>\n\n\n\n<p>\u5148\u770b\u9996\u5b57\u8282\uff0c\u5224\u65ad\u7248\u672c\u548c\u9996\u90e8\u957f\u5ea6\u3002<br>\u518d\u770b\u603b\u957f\u5ea6\u5b57\u6bb5\uff0c\u5f97\u5230\u6574\u4e2a IP \u5206\u7ec4\u957f\u5ea6\u3002<br>\u7136\u540e\u7528\u201c\u603b\u957f\u5ea6 &#8211; \u9996\u90e8\u957f\u5ea6\u201d\u7b97\u51fa\u6570\u636e\u90e8\u5206\u957f\u5ea6\u3002<br>\u63a5\u7740\u5b9a\u4f4d\u6e90 IP \u548c\u76ee\u7684 IP\uff0c\u9010\u5b57\u8282\u8f6c\u5341\u8fdb\u5236\u3002<br>\u518d\u770b\u201c\u6807\u5fd7 + \u7247\u504f\u79fb\u201d\u5b57\u6bb5\uff0c\u5224\u65ad\u662f\u5426\u5206\u7247\u3001\u662f\u4e0d\u662f\u6700\u540e\u4e00\u4e2a\u5206\u7247\u3002<br>\u5982\u679c\u9898\u76ee\u95ee\u504f\u79fb\u91cf\uff0c\u8bb0\u5f97\u628a\u7247\u504f\u79fb\u5b57\u6bb5\u503c\u518d\u4e58 8\uff0c\u5f97\u5230\u5b9e\u9645\u5b57\u8282\u504f\u79fb\u3002<br>\u5982\u679c\u9898\u76ee\u51fa\u73b0 MTU\uff0c\u518d\u628a IP \u603b\u957f\u5ea6\u548c MTU \u6bd4\u8f83\uff0c\u5e76\u7ed3\u5408 DF \u5224\u65ad\u201c\u5206\u7247\u8f6c\u53d1\u201d\u8fd8\u662f\u201c\u4e22\u5f03\u5e76\u53d1\u9001 ICMP\u201d\u3002<\/p>\n\n\n\n<p>\u628a\u8fd9\u4e2a\u6d41\u7a0b\u56fa\u5b9a\u4e0b\u6765\u4e4b\u540e\uff0c\u9898\u76ee\u54ea\u6015\u7ed9\u4e00\u957f\u4e32\u5341\u516d\u8fdb\u5236\uff0c\u770b\u8d77\u6765\u518d\u4e71\uff0c\u672c\u8d28\u4e5f\u53ea\u662f\u7167\u7740\u6a21\u677f\u5f80\u4e0b\u586b\u7a7a\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u4e5d\u3001\u4e00\u4e2a\u53ef\u4ee5\u76f4\u63a5\u5957\u7528\u7684\u7b54\u9898\u6a21\u677f<\/h3>\n\n\n\n<p>\u8003\u8bd5\u65f6\u5982\u679c\u60f3\u5199\u5f97\u5feb\u4e00\u4e9b\uff0c\u53ef\u4ee5\u76f4\u63a5\u6309\u8fd9\u4e2a\u683c\u5f0f\u7ec4\u7ec7\u7b54\u6848\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>1. \u7b2c1\u5b57\u8282\u4e3a XX\uff1a\n   - \u7248\u672c = X\n   - \u9996\u90e8\u957f\u5ea6 = X \u00d7 4 = XXB\n\n2. \u603b\u957f\u5ea6\u5b57\u6bb5\u4e3a XXXX\uff1a\n   - \u603b\u957f\u5ea6 = XXB\n\n3. \u6570\u636e\u90e8\u5206\u957f\u5ea6\uff1a\n   - \u6570\u636e\u957f\u5ea6 = \u603b\u957f\u5ea6 - \u9996\u90e8\u957f\u5ea6 = XXB\n\n4. \u6e90IP\u5730\u5740\uff1a\n   - XX.XX.XX.XX\n\n5. \u76ee\u7684IP\u5730\u5740\uff1a\n   - XX.XX.XX.XX\n\n6. \u6807\u5fd7 + \u7247\u504f\u79fb\u5b57\u6bb5\u4e3a XXXX\uff1a\n   - DF = X\n   - MF = X\n   - \u7247\u504f\u79fb\u5b57\u6bb5\u503c = XX\n   - \u5b9e\u9645\u5b57\u8282\u504f\u79fb\u91cf = XX \u00d7 8 = XXB\n\n7. \u82e5\u6d89\u53ca MTU\uff1a\n   - \u82e5\u603b\u957f\u5ea6 &gt; MTU\uff0c\u4e14 DF=0\uff0c\u5219\u5206\u7247\u8f6c\u53d1\n   - \u82e5\u603b\u957f\u5ea6 &gt; MTU\uff0c\u4e14 DF=1\uff0c\u5219\u4e22\u5f03\u5e76\u53d1\u9001 ICMP \u5dee\u9519\u62a5\u6587\n<\/code><\/pre>\n\n\n\n<p>\u8fd9\u4e2a\u6a21\u677f\u7684\u597d\u5904\u5728\u4e8e\uff0c\u5b83\u628a\u5e38\u8003\u70b9\u5168\u90e8\u4e32\u8d77\u6765\u4e86\u3002\u9898\u76ee\u65e0\u8bba\u600e\u4e48\u53d8\uff0c\u6838\u5fc3\u90fd\u7ed5\u4e0d\u5f00\u8fd9\u51e0\u4e2a\u5b57\u6bb5\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u5341\u3001\u6700\u540e\u628a\u6700\u5bb9\u6613\u9519\u7684\u70b9\u518d\u538b\u4e00\u904d<\/h3>\n\n\n\n<p>\u590d\u4e60\u8fd9\u7c7b\u9898\u65f6\uff0c\u6211\u901a\u5e38\u4f1a\u53cd\u590d\u63d0\u9192\u81ea\u5df1\u4e09\u4ef6\u4e8b\u3002<\/p>\n\n\n\n<p>\u7b2c\u4e00\uff0c\u9996\u90e8\u957f\u5ea6\u7684\u5355\u4f4d\u662f\u201c4B\u201d\uff0c\u4e0d\u662f 1B\u3002<br>\u9996\u5b57\u8282\u4f4e 4 \u4f4d\u5982\u679c\u662f 5\uff0c\u8868\u793a\u7684\u662f 5 \u4e2a 32 \u4f4d\u5b57\uff0c\u6240\u4ee5\u8981\u4e58 4 \u624d\u5f97\u5230\u5b57\u8282\u6570\u3002<\/p>\n\n\n\n<p>\u7b2c\u4e8c\uff0c\u7247\u504f\u79fb\u5b57\u6bb5\u7684\u5355\u4f4d\u662f\u201c8B\u201d\uff0c\u4e0d\u662f 1B\u3002<br>\u5b57\u6bb5\u503c\u548c\u771f\u5b9e\u5b57\u8282\u504f\u79fb\u91cf\u4e0d\u662f\u540c\u4e00\u4e2a\u4e1c\u897f\u3002<\/p>\n\n\n\n<p>\u7b2c\u4e09\uff0cMTU \u6bd4\u8f83\u7684\u662f IP \u603b\u957f\u5ea6\uff0c\u800c\u4e0d\u662f\u6570\u636e\u957f\u5ea6\u3002<br>\u8fd9\u4e2a\u5730\u65b9\u4e00\u6df7\uff0c\u540e\u9762\u6574\u9898\u5c31\u5bb9\u6613\u9519\u3002<\/p>\n\n\n\n<p>\u5982\u679c\u628a\u8fd9\u4e09\u4e2a\u5355\u4f4d\u95ee\u9898\u538b\u4f4f\uff0c\u8fd9\u7c7b\u9898\u5927\u591a\u6570\u65f6\u5019\u90fd\u80fd\u505a\u5bf9\u3002<\/p>\n\n\n\n<p><\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u8fd9\u4e24\u4e2a\u95ee\u9898\u5176\u5b9e\u521a\u597d\u8fde\u5728\u4e00\u8d77\u4e86\u3002 \u7b2c 7 \u9898\u7684\u672c\u8d28\uff0c\u4e0d\u662f\u201c\u628a\u5341\u516d\u8fdb\u5236\u5168\u90e8\u8001\u8001\u5b9e\u5b9e\u8f6c\u6210\u5341\u8fdb\u5236\u201d\uff0c\u800c\u662f\u201c\u5229\u7528\u5341\u516d\u8fdb\u5236 [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[54],"tags":[],"class_list":["post-1980","post","type-post","status-publish","format-standard","hentry","category-text"],"_links":{"self":[{"href":"http:\/\/www.preluna.xyz\/index.php\/wp-json\/wp\/v2\/posts\/1980","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/www.preluna.xyz\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/www.preluna.xyz\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/www.preluna.xyz\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/www.preluna.xyz\/index.php\/wp-json\/wp\/v2\/comments?post=1980"}],"version-history":[{"count":2,"href":"http:\/\/www.preluna.xyz\/index.php\/wp-json\/wp\/v2\/posts\/1980\/revisions"}],"predecessor-version":[{"id":1986,"href":"http:\/\/www.preluna.xyz\/index.php\/wp-json\/wp\/v2\/posts\/1980\/revisions\/1986"}],"wp:attachment":[{"href":"http:\/\/www.preluna.xyz\/index.php\/wp-json\/wp\/v2\/media?parent=1980"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/www.preluna.xyz\/index.php\/wp-json\/wp\/v2\/categories?post=1980"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/www.preluna.xyz\/index.php\/wp-json\/wp\/v2\/tags?post=1980"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}