{"id":3918,"date":"2021-11-25T21:53:17","date_gmt":"2021-11-26T05:53:17","guid":{"rendered":"https:\/\/www.xh86.me\/?p=3918"},"modified":"2021-11-25T22:13:41","modified_gmt":"2021-11-26T06:13:41","slug":"%e6%9c%89%e6%b2%a1%e6%9c%89%e5%a5%bd%e5%a5%87%e8%bf%87%e8%b7%af%e7%94%b1%e5%99%a8%e5%ae%bd%e5%b8%a6%e6%8b%a8%e5%8f%b7%e7%9a%84mtu%e5%80%bc%e4%b8%ba%e4%bb%80%e4%b9%88%e6%98%af1492%e5%91%a2%ef%bc%9f","status":"publish","type":"post","link":"https:\/\/www.xh86.me\/?p=3918","title":{"rendered":"\u8def\u7531\u5668\u5bbd\u5e26\u62e8\u53f7\u7684mtu\u503c\u4e3a\u4ec0\u4e48\u662f1492\u5462\uff1f\u4e86\u89e3MTU\u4e0eIP\u5206\u7247"},"content":{"rendered":"
\n

 <\/p>\n

MTU\u4e0eIP\u5206\u7247\uff08\u53ef\u9009\u5185\u5bb9\u4e86\u89e3\uff09<\/span><\/p>\n

\u8fd9\u91cc\u6765\u8bb2\u4e00\u4e2a\u6bd4\u8f83\u6709\u8da3\u7684\u5185\u5bb9\uff0c\u76f8\u4fe1\u5927\u5bb6\u90fd\u6709\u8bbe\u7f6e\u8fc7\u5bb6\u7528\u8def\u7531\u5668\u7684\u7ecf\u5386\uff0c\u4e0d\u77e5\u9053\u6709\u6ca1\u6709\u53d1\u73b0\u4e00\u4e2a\u4e8b\u60c5\uff0c\u5728\u8bbe\u7f6e\u62e8\u53f7\u7684\u65f6\u5019\uff0c\u91cc\u9762\u6709\u4e00\u4e2aMTU\uff0c\u503c\u901a\u5e38\u662f1492\u6216\u80051480\uff0c\u5982\u679c\u63a5\u5165\u65b9\u5f0f\u6539\u4e3aDHCP\u7684\u60c5\u51b5\u4e0b\uff0cMTU\u5c31\u53d8\u6210\u4e861500\uff0c\u4e3a\u4ec0\u4e48\u5462\uff1f<\/span><\/p>\n

\u00a0<\/span><\/p>\n

\uff081\uff09\u4e86\u89e3MTU\u7684\u4f5c\u7528<\/span><\/strong><\/span><\/p>\n

Maximum Transmission Unit\uff08MTU\uff09\uff1a\u6700\u5927\u4f20\u8f93\u5355\u5143\u3002\u8fd8\u662f\u4ee5\u4e0a\u9762\u7684\u4f8b\u5b50\uff0c\u4e3a\u4ec0\u4e48\u8def\u7531\u5668\u62e8\u53f7\u7684\u65f6\u5019\u8981\u628aMTU\u8bbe\u7f6e\u62101492\u5462\uff1f\u5728\u8fd9\u4e4b\u524d\u5df2\u7ecf\u77e5\u9053\u4e86\u4ee5\u592a\u7f51\u5934\u90e8\uff0c\u4e00\u4e2a\u6807\u51c6\u7684\u4ee5\u592a\u7f51\u6570\u636e\u5e27\u6700\u5927\u4e3a1518\uff0c\u5176\u4e2d\u6e90MAC 6\u5b57\u8282\uff0c\u76ee\u7684MAC 6\u4e2a\u5b57\u8282\uff0cType 2\u4e2a\u5b57\u8282\uff0cFCS 4\u4e2a\u5b57\u8282\uff08\u524d\u5bfc\u7801\u4e0d\u7b97\u5728\u5185\uff0c\u5728\u7269\u7406\u5c42\u5c31\u5df2\u7ecf\u53bb\u6389\u4e86\uff09\uff0c6+6+2+4=18\u4e2a\u5b57\u8282\uff0c1518-18=1500\uff0c\u8fd91500\u6b63\u597d\u662f\u662f\u7559\u7ed9\u4e0a\u5c42\u534f\u8bae\u4f20\u8f93\u7684\u5927\u5c0f\uff0c\u4e5f\u5c31\u662f\u6211\u4eec\u8bf4\u7684\u6570\u636e\u5e27\u7684\u5927\u5c0f\u662f1500\u4e2a\u5b57\u8282\uff0c\u5305\u62ecIP\u5934\u90e8\u4ee5\u53ca\u4e0a\u5c42\u534f\u8bae\u4e0e\u6570\u636e\u6574\u4f53\u5728\u5185\uff0c\u4e5f\u5c31\u662f\u8bf4\u5728\u4e8c\u5c42\u4ee5\u592a\u7f51\u4e2d\uff0c\u5b9e\u9645\u80fd\u4f20\u8f93\u7684\u6570\u636e\u662f1500\u4e2a\u5b57\u8282\u3002<\/span><\/p>\n

\u00a0<\/span><\/p>\n

\u4e3e\u4e00\u4e2a\u6700\u5e38\u89c1\u7684\u4f8b\u5b50\uff0c\u6211\u4eec\u5e73\u65f6\u5728\u5bb6\u91cc\u7528\u624b\u673a\u6216\u8005\u7b14\u8bb0\u672c\u8fde\u63a5\u5bb6\u7528\u8def\u7531\u5668\u770b\u7535\u89c6\u5267\u3001\u5237\u6296\u97f3\uff0c\u6570\u636e\u5305\u90fd\u662f\u8fd9\u6837\u7684\u8def\u5f84\uff0c\u6bcf\u4e2a\u8282\u70b9\u90fd\u6709\u5bf9\u5e94\u7684MTU\u503c\uff0c\u6b63\u5e38\u90fd\u4e3a1500.<\/span><\/p>\n

<\/div><\/p>\n

\u5047\u8bbe\u67d0\u4e00\u5929\uff0c\u5916\u7f51\u7684\u5bf9\u63a5\u65b9\u5f0f\u53d8\u4e86\uff0c\u53d8\u6210\u4e86\u62e8\u53f7\u7684\u5f62\u5f0f\uff0c\u6b63\u5e38\u8bbe\u7f6e\u540e\uff0c\u53d1\u73b0\u6253\u5f00\u7f51\u9875\u5f88\u6162\u6216\u8005\u6253\u4e0d\u5f00\uff0c\u54a8\u8be2\u8def\u7531\u5668\u5ba2\u670d\u540e\uff0c\u628aMTU\u503c\u6539\u62101492\u6216\u8005\u66f4\u5c0f\u70b9\uff0c\u60ca\u5947\u7684\u4e8b\u60c5\u53d1\u751f\u4e86\uff0c\u90fd\u80fd\u6b63\u5e38\u8bbf\u95ee\u4e86\uff0c\u8fd9\u5c31\u56de\u5230\u4e4b\u524d\u7684\u95ee\u9898\u4e86\uff0c\u4e3a\u4ec0\u4e48\u73b0\u5728\u7684\u8def\u7531\u5668MTU\u90fd\u4f1a\u8bbe\u7f6e\u62101492\u5462\uff1f<\/span><\/p>\n

<\/div><\/p>\n

\u90a3\u662f\u56e0\u4e3a\u5bbd\u5e26\u62e8\u53f7\u4f7f\u7528\u7684\u534f\u8bae\u662fPPPoE\uff0c\u7531\u4e8e\u8fd8\u6ca1\u6d89\u53ca\u8fd9\u4e00\u5757\u7684\u77e5\u8bc6\u70b9\uff0c\u6211\u4eec\u5728\u8fd9\u77e5\u9053\u5b83\u5360\u75288\u4e2a\u5b57\u8282\u5c31\u884c\uff0c\u5e76\u4e14\u662f\u5c01\u88c5\u5728\u4ee5\u592a\u7f51\u4e2d\u7684\u3002\u6bd4\u5982\u8bbf\u95ee\u8005\u53d1\u9001\u4e86\u4e00\u4e2a1495\u5b57\u8282\u7684\u6570\u636e\u5305\u7ed9\u89c6\u9891\u670d\u52a1\u5668\uff0c\u4f46\u662f\u7531\u4e8e\u5bb6\u7528\u8def\u7531\u5668\u91c7\u7528\u7684\u662f\u8fd9\u5c31\u5728\u539f\u67651500\u7684\u5b57\u8282\u4e0a\u591a\u51fa\u6765\u4e868\u4e2a\u5b57\u8282\uff0c\u8d85\u8fc7\u4e86\u6807\u51c6\u7684MTU\u503c1500\u5b57\u8282\uff0c\u6240\u4ee5\u8fd9\u4e2a\u65f6\u5019\u5bb6\u7528\u8def\u7531\u5668\u4f1a\u5c06\u8fd9\u4e2a\u6570\u636e\u5305\u8fdb\u884c\u5206\u7247\uff0c\u5206\u4e3a2\u4e2a\uff0c\u4e00\u4e2a\u4e3a\u6570\u636e\u5305\u4e3a1500\u4e2a\u5b57\u8282\uff0c\u53e6\u5916\u4e00\u4e2a\u6570\u636e\u5305\u4e3a3\u4e2a\u5b57\u8282\uff0c\u5230\u4e86\u670d\u52a1\u5668\u8fd9\u8fb9\u5728\u8fdb\u884c\u91cd\u7ec4\u3002\uff08\u5b9e\u9645\u4f1a\u66f4\u52a0\u590d\u6742\u70b9\uff0c\u5f85\u4f1a\u6211\u4eec\u6765\u505a\u4e2a\u5c0f\u5b9e\u9a8c\uff09<\/span><\/p>\n

\u00a0<\/span><\/p>\n

\uff082\uff09IP\u5206\u7247\u5e26\u6765\u7684\u95ee\u9898<\/span><\/strong><\/span><\/p>\n

\u00a0IP\u5206\u7247\u5176\u5b9e\u5728\u7f51\u7edc\u4e2d\u662f\u4e00\u79cd\u6bd4\u8f83\u7cdf\u7cd5\u7684\u60c5\u51b5\uff0c\u5e26\u6765\u4e86\u51e0\u4e2a\u95ee\u9898<\/span><\/p>\n

    \n
  • \u4f20\u8f93\u6548\u7387\u964d\u4f4e\uff1a\u5206\u7247\u4f1a\u964d\u4f4e\u4f20\u8f93\u6548\u7387\uff08\u8fd9\u4e2a\u5f85\u4f1a\u6211\u4eec\u7528\u7b80\u5355\u7684\u5b9e\u9a8c\u53ef\u4ee5\u770b\u5230\uff09<\/span><\/li>\n
  • \u589e\u52a0\u8bbe\u5907\u7684\u538b\u529b\uff1a\u539f\u672c\u4e00\u4e2a\u6570\u636e\u5305\u5927\u5c0f\u6b63\u597d\u57281500\u5b57\u8282\u7684\u8303\u56f4\u5185\uff0c\u76f4\u63a5\u5c31\u53d1\u9001\u4e86\uff0c\u5982\u679c\u8d85\u8fc7\u4e861500\u4e2a\u5b57\u8282\uff0c\u5c31\u9700\u8981\u6d89\u53ca\u5230\u5206\u7247\uff0c\u5982\u679c\u8fd9\u79cd\u6570\u636e\u5305\u4e00\u591a\uff0c\u5bf9\u5e94\u7684\u8bbe\u5907\u538b\u529b\u5c31\u4f1a\u589e\u5927\uff0c\u5360\u7528\u8bbe\u5907\u7684\u8d44\u6e90\u3002<\/span><\/li>\n
  • \u5ef6\u8fdf\u52a0\u5927\uff1a\u5206\u7247\u53e6\u5916\u4e00\u4e2a\u95ee\u9898\u5c31\u662f\u5f53\u540c\u4e00\u4e2a\u6570\u636e\u5305\u7684\u591a\u4e2a\u5206\u7247\u62b5\u8fbe\u76ee\u7684\u5730\u540e\uff0c\u76ee\u7684\u7ec8\u7aef\u9700\u8981\u5c06\u6570\u636e\u5305\u91cd\u7ec4\u6392\u5217\u540e\u624d\u80fd\u591f\u53bb\u8bfb\u53d6\u91cc\u9762\u7684\u5185\u5bb9\u3002\u597d\u6bd4\u4e00\u4e2a\u5927\u7684\u7269\u4ef6\u88ab\u62c6\u5206\u6210\u591a\u4e2a\u5c0f\u7684\u7269\u4ef6\u53d1\u9001\u51fa\u53bb\uff0c\u63a5\u6536\u540e\uff0c\u9700\u8981\u8fdb\u884c\u91cd\u65b0\u7ec4\u88c5\uff0c\u66f4\u7cdf\u7cd5\u7684\u662f\u4e07\u4e00\u67d0\u4e00\u4e2a\u7ec4\u4ef6\u665a\u5230\uff0c\u90a3\u4e48\u5176\u4ed6\u5230\u4e86\u7684\u7ec4\u4ef6\u5c31\u5f97\u7b49\u5f85\uff1b\u5728IP\u5206\u7247\u91cd\u7ec4\u4e2d\u4e5f\u662f\u8fd9\u6837\u7684\uff0c\u6240\u4ee5\u4f1a\u5bfc\u81f4\u5ef6\u8fdf\u52a0\u5927\u3002<\/span><\/li>\n
  • \u4e22\u5305\uff1a\u66f4\u4e25\u91cd\u7684\u662f\uff0c\u5728\u590d\u6742\u7684\u7f51\u7edc\u73af\u5883\u4e2d\uff0c\u4e07\u4e00\u67d0\u4e00\u4e2a\u5206\u7247\u4e22\u5931\u4e86\uff0c\u90a3\u5176\u4f59\u63a5\u6536\u5230\u7684\u6570\u636e\u5c31\u6ca1\u4efb\u4f55\u610f\u4e49\u4e86\uff0c\u7ec4\u4e0d\u6210\u4e00\u4e2a\u5b8c\u6574\u7684\u6570\u636e\u5305\uff0c\u4ece\u800c\u88ab\u4e22\u5f03\u3002<\/span><\/li>\n
  • \u67d0\u4e9b\u5e94\u7528\u8bbf\u95ee\u5931\u6548\uff1a\u6bd4\u5982\u4e0a\u9762\u7684\u7f51\u9875\u6253\u5f00\u5931\u8d25\u6216\u8005\u5f88\u6162\u5c31\u662f\u56e0\u4e3a\u5206\u7247\u9020\u6210\u7684\uff0c\u6709\u7684\u670d\u52a1\u5668\u6709\u4fdd\u62a4\u63aa\u65bd\uff0c\u62d2\u7edd\u63a5\u6536\u5206\u7247\u7684\u6570\u636e\u5305\u3002<\/span><\/li>\n<\/ul>\n

    \u00a0<\/span><\/p>\n

    \uff083\uff09\u4e3a\u4ec0\u4e48MTU\u662f1500\u5462\uff0c\u660e\u660eIP\u5b57\u6bb5\u7684\u603b\u957f\u5ea6\u662f65535\uff1f<\/span><\/strong><\/p>\n

    \u4e4b\u524d\u5b66\u8fc7IP\u5934\u90e8\u7684\u5185\u5bb9\uff0cIP\u5934\u90e8\u91cc\u9762\u6709\u4e00\u4e2a\u603b\u957f\u5ea6\uff0c\u6700\u5927\u503c\u662f65535\uff0c\u8868\u793aIP\u534f\u8bae\u662f\u80fd\u591f\u627f\u8f7d\u8fd9\u4e48\u5927\u6570\u636e\u5305\u7684\uff0c\u4f46\u662f\u7531\u4e8e\u4ee5\u592a\u7f51\u7684\u6570\u636e\u90e8\u5206\u6700\u5927\u4e3a1500\uff0c\u6240\u4ee5\u4f60\u5728\u5f88\u591a\u4e66\u7c4d\u6216\u8005\u79f0\u547c\u91cc\u9762\u4f1a\u770b\u5230IP\u7684\u6570\u636e\u5305\u6700\u5927\u662f1500\u4e2a\u5b57\u8282\uff0c\u591a\u4e86\u5c31\u4f1a\u88ab\u5206\u7247\uff0c\u90a3\u4e3a\u4ec0\u4e48\u4ee5\u592a\u7f51\u8981\u628a\u6570\u636e\u90e8\u5206\u5b9a\u57281500\uff0c\u4e0d\u80fd\u8ddfIP\u5934\u90e8\u4e00\u6837\u752865535\u5417\uff1f\u90a3\u6548\u7387\u4e0d\u662f\u9ad8\u5f88\u591a\u3002<\/span><\/p>\n

    \u00a0<\/span><\/p>\n

      \n
    • \u4ee5\u592a\u7f51\u6700\u5c0f\u5b57\u8282\u4e3a\u4ec0\u4e48\u8981\u6c42\u662f<\/span>64<\/span>\u5462\uff1f<\/span><\/span><\/li>\n<\/ul>\n

      \u6700\u65e9\u7684\u4ee5\u592a\u7f51\u662f\u5de5\u4f5c\u5728\u5171\u4eab\u7f51\u7edc\u4e0b\u7684\uff0c\u4efb\u4f55\u4e00\u4e2a\u7ec8\u7aef\u8282\u70b9\u53d1\u9001\u6570\u636e\u4e4b\u524d\uff0c\u90fd\u9700\u8981\u4fa6\u542c\u7ebf\u8def\u4e0a\u662f\u5426\u6709\u6570\u636e\u5728\u4f20\uff0c\u5982\u679c\u6709\uff0c\u9700\u8981\u7b49\u5f85\uff0c\u5982\u679c\u53d1\u73b0\u7ebf\u8def\u53ef\u7528\uff0c\u624d\u53ef\u4ee5\u53d1\u9001\u3002\u5047\u8bbeA\u4e0eB\u7ec8\u7aef\u540c\u65f6\u4f20\u8f931\u4e2abit\u7ed9\u5bf9\u65b9\u7684\u8bdd\uff0c\u4f1a\u4ea7\u751f\u51b2\u7a81\uff0c\u5176\u4e2d\u4e00\u4e2a\u5c31\u9700\u8981\u7b49\u5f85\u4e00\u7aef\u53d1\u9001\u5b8c\u6210\u540e\u5728\u8fc7\u4e00\u4e2a\u65f6\u95f4\u95f4\u9699\u624d\u80fd\u53d1\u9001\uff0c\u8fd9\u4e2a\u65f6\u95f4\u95f4\u9699\u662f57.6\u03bcs\u3002<\/span><\/p>\n

      \u00a0<\/span><\/p>\n

      \u572810Mbps\u7684\u4ee5\u592a\u7f51\u4e2d\uff0c\u572857.6\u03bcs\u65f6\u95f4\u5185\uff0c\u80fd\u591f\u4f20\u8f93576\u4e2abit\uff0c\u4ee5\u592a\u7f51\u4e2d\u8981\u6c42\u6570\u636e\u5e27\u6700\u5c0f\u957f\u5ea6\u4e3a576\u4e2abit\uff0c\u539f\u56e0\u662f\u8fd9\u4e2a\u957f\u5ea6\u6b63\u597d\u80fd\u591f\u8ba9\u6700\u6781\u7aef\u7684\u51b2\u7a81\u73af\u5883\u90fd\u80fd\u591f\u88ab\u68c0\u6d4b\u5230\uff08CSMA\/CD\uff09\uff0c\u800c576\u4e2abit\u6362\u7b97\u6210\u5b57\u8282\u662f72\uff0c\u53bb\u63898\u4e2a\u5b57\u8282\u7684\u524d\u5bfc\u7b26\uff0c\u6b63\u597d\u662f64\u4e2a\u5b57\u8282\uff0c\u8fd9\u4e5f\u662f\u4ee5\u592a\u7f51\u5e27\u6570\u636e\u90e8\u5206\u8981\u6c42\u7684\u6700\u5c0f\u957f<\/span>46<\/span>\u7684\u539f\u56e0\uff08<\/span>46+18<\/span>\uff09\uff0c\u4e0d\u591f<\/span>46<\/span>\u7684\u4f1a\u81ea\u52a8\u586b\u5145\u3002<\/span><\/span><\/p>\n

      \u00a0<\/span><\/p>\n

        \n
      • \u00a0MTU<\/span>\u503c\u4e3a\u4ec0\u4e48\u662f<\/span>1500<\/span><\/span><\/li>\n<\/ul>\n

        \u00a0\u00a0\u00a0\u00a0 \u8fd9\u4e2a\u662f\u4e86\u89e364\u5b57\u8282\u7684\u7531\u6765\uff0c\u662f\u56e0\u4e3a\u65e9\u671f\u5de5\u4f5c\u65b9\u5f0f\u7684\u539f\u56e0\uff08CSMA\/CD<\/span>\uff09\uff0c\u90a31500\u5b57\u8282<\/span>\u53c8\u662f\u4ec0\u4e48\u539f\u56e0\u5462\uff1f<\/span><\/p>\n

        \u00a0<\/span><\/p>\n

        \u5047\u8bbe\u4ee5\u592a\u7f51\u6ca1\u6709\u8fd9\u4e2a\u9650\u5236\uff0cIP\u534f\u8bae\u6700\u5927\u53ef\u4ee5\u627f\u8f7d65535\u5b57\u8282\uff0c\u52a0\u4e0a\u4ee5\u592a\u7f51\u5934\u90e8\u548c\u5c3e\u90e8\uff0c\u662f65535+14+4=65553\u5b57\u8282\uff0c\u5982\u679c\u65e9\u671f\u572810Mbps\u7684\u4ee5\u592a\u7f51\u4e0a\u4f20\u8f93\uff0c\u4f1a\u5360\u7528\u5171\u4eab\u94fe\u8def50ms,\u8fd9\u6837\u4e25\u91cd\u5f71\u54cd\u4e86\u5176\u4ed6\u4e3b\u673a\u7684\u901a\u4fe1\uff0c\u5982\u679c\u6709\u5ef6\u8fdf\u654f\u611f\u7684\u5e94\u7528\uff0c\u90a3\u80af\u5b9a\u662f\u65e0\u6cd5\u63a5\u6536\u7684\uff0c\u53e6\u5916\u5982\u679c\u7ebf\u8def\u7684\u8d28\u91cf\u5dee<\/span>\uff0c\u5927\u5305\u5f15\u8d77\u7684\u4e22\u5305\u51e0\u7387\u4e5f\u4f1a\u5927\u5f88\u591a\u3002\uff0850ms\u7684\u8ba1\u7b97\u65b9\u6cd5\uff1a\uff0865553*8\uff09\/\uff0810*1024*1024\uff09\u22480.05\uff08s\uff09\uff08\u5c0f\u77e5\u8bc6\u70b9\u79d1\u666e\uff1aMbps\u4e3a\u6bcf\u79d2\u4f20\u8f93\u767e\u4e07\u4f4d\u6bd4\u7279<\/span>\uff0c\u800c65535\u662f\u5b57\u8282\u5355\u4f4d\uff0c1\u5b57\u8282=8\u6bd4\u7279\uff0c\u6240\u4ee5\u9700\u8981*8\uff0c10Mbps\u6362\u7b97\u6210bps\u5c31\u662f10*1024*1024\uff09\uff09<\/span><\/p>\n

        \u00a0<\/span><\/p>\n

        \u7adf\u7136\u5927\u7684\u4e0d\u884c\uff0c\u6362\u6210\u5c0f\u7684\u5462\uff1f\uff0c\u6bd4\u5982<\/span>MTU<\/span>\u7b49\u4e8e100<\/span>\uff0c\u5c31\u62ff\u4e0a\u9762\u5b66\u8fc7\u7684ICMP<\/span>\u7684Ping\u6765\u8bf4\uff0c\u5982\u679c\u4ee5\u592a\u7f51\u957f\u5ea6\u4e3a100\uff0cICMP\u5b9e\u9645\u6570\u636e= 100-ICMP\u5934\u90e8\uff088\u4e2a\u5b57\u8282\uff09-IP\u5934\u90e8\uff0820\u4e2a\u5b57\u8282\uff09-\u4ee5\u592a\u7f51\u5934\u90e8\uff0818\u4e2a\u5b57\u8282\uff09=100-8-20-18=54\uff0c\u4f60\u4f1a\u53d1\u73b0\u6709\u6548\u7387\u5b9e\u5728\u592a\u4f4e\u4e86\uff0c\u6709\u6548\u7387<\/span>=54\/100=54%<\/span><\/p>\n

        \u00a0<\/span><\/cite><\/p>\n

        \u6700\u7ec8\u5f97\u5230\u4e00\u4e2a\u901a\u8fc7\u5c42\u5c42\u8ba1\u7b97\uff0c\u53d1\u73b0\u5982\u679c\u4ee5\u592a\u7f51\u957f\u5ea6\u4e3a<\/span>1518<\/span>\u7684\u65f6\u5019\uff0c\u6709\u6548\u4f20\u8f93\u6548\u7387=1472\/1518=96.9%\uff0c\u8fd9\u4e2a\u503c\u65e2\u80fd\u4fdd\u8bc1\u6709\u4e00\u4e2a\u8f83\u5927\u7684\u5e27\u957f\u5ea6\uff0c\u53c8\u4fdd\u8bc1\u4e86\u6709\u6548\u4f20\u6548\u7387\u3002\u66f4\u5927\u7684\u6216\u8005\u66f4\u5c0f\u7684\u5c31\u4f1a\u51fa\u73b0\u4e0a\u8ff0\u7684\u95ee\u9898\uff0c\u8fd9\u4e2a\u4e5f\u662f\u4e00\u4e2a\u6298\u4e2d\u7684\u957f\u5ea6\uff1a1518\u5b57\u8282\uff0c\u5bf9\u5e94\u4e0a\u5c42IP \u5c31\u662f1500\u5b57\u8282\uff081518-18\uff09\uff0c\u8fd9\u4e2a\u5c31\u662f\u6700\u5927\u4f20\u8f93\u5355\u5143MTU<\/span>\u7684\u7531\u6765\u3002<\/span><\/p>\n

        \u00a0<\/span><\/p>\n

          \n
        • \u4e3a\u4ec0\u4e48\u4e0d\u6539\u5584\u8fd9\u4e2a\u95ee\u9898\u5462\uff1f<\/span><\/li>\n<\/ul>\n

          \u51fa\u73b0\u8fd9\u4e2a\u95ee\u9898\u662f\u56e0\u4e3a\u65e9\u671f\u4ee5\u592a\u7f51\u901a\u8fc7H<\/span>ub\u8fd9\u4e9b\u8bbe\u5907\u5de5\u4f5c\uff0c\u5904\u4e8e\u5171\u4eab\u65b9\u5f0f\uff0c\u6548\u7387\u5f88\u4f4e\uff0c\u800c\u73b0\u5728\u7684\u7f51\u7edc\u65e9\u5df2\u4e0d\u662f10M\u7684\u7f51\u7edc\u4e86\uff0c\u4ea4\u6362\u673a\u5df2\u7ecf\u652f\u63011G\uff0c10G\u3001100G\uff0c\u800c\u4e14\u5e26\u5bbd\u72ec\u4eab\uff0c\u53ef\u4ee5\u540c\u65f6\u6536\u53d1\u7684\u7279\u6027\uff0c\u90a3\u6709\u6548\u4f20\u8f93\u6548\u7387\u8ddf\u8d28\u91cf\u63d0\u5347\u4e86\u975e\u5e38\u591a\uff0c\u4f46\u662f\u5982\u4eca\u7684\u7f51\u7edc\u4f60\u4f1a\u53d1\u73b0\u5e38\u89c1\u7684\u8fd8\u662f\u7528\u7684mtu 1500\u7684\u6807\u51c6\uff0c\u53ea\u6709\u6570\u636e\u4e2d\u5fc3\u6216\u8005\u67d0\u4e9b\u7279\u6b8a\u73af\u5883\u4f7f\u7528\u4e86\u4e00\u4e2a\u53eb\u505a\u5de8\u578b\u5e27 Jumbo Frame<\/span>\uff0c\u53ef\u4ee5\u652f\u6301\u5927\u4e8e9000\u5b57\u8282\u7684\u5927\u5c0f\uff0c\u5982\u679c\u5168\u7f51\u90fd\u4f7f\u7528\u8fd9\u79cd\uff0c\u90a3\u4f20\u8f93\u5927\u7684\u6587\u4ef6\u8fd9\u4e9b\u4e0d\u662f\u66f4\u5feb\u3001\u5ef6\u8fdf\u5f88\u5c0f\u5417\uff1f<\/span><\/p>\n

          \u00a0<\/span><\/p>\n

          \u4f46\u662f\u73b0\u5b9e\u73af\u5883\u6ca1\u8fd9\u4e48\u7b80\u5355\uff0c\u56e0\u4e3aMTU<\/span>\u5728\u6bcf\u4e2a\u8bbe\u5907\u7684\u6bcf\u4e00\u4e2a\u63a5\u53e3\uff08\u7f51\u5361\uff09\u4e0a\u9762\u90fd\u662f\u5b58\u5728\u7684<\/span><\/p>\n

           <\/p>\n

          \u5982\u679c\u8bbf\u95ee\u8005\u652f\u6301<\/span>MTU 9000<\/span>\uff0c\u53d1\u9001\u4e86\u4e00\u4e2a<\/span>9000<\/span>\u5927\u5c0f\u7684\u6570\u636e\u5305\u4ea4\u7ed9\u65e0\u7ebf\u8def\u7531\u5668\uff0c\u65e0\u7ebf\u8def\u7531\u6b63\u597d\u4e5f\u652f\u6301\u8fd9\u4e48\u5927\uff0c\u4ea4\u7ed9\u4e92\u8054\u7f51\u8bbe\u5907\uff0c\u4e92\u8054\u7f51\u4e2d\u8bbe\u5907\u975e\u5e38\u591a\uff0c\u5e76\u4e0d\u662f\u6240\u6709\u8bbe\u5907\u90fd\u80fd\u591f\u53bb\u652f\u6301\u5de8\u578b\u5e27\u7684\u7279\u6027\uff0c\u5f88\u591a\u5730\u65b9\u8fd8\u4f7f\u7528\u7684\u975e\u5e38\u8001\u7684\u8bbe\u5907\u5728\u8fd0\u884c\uff0c\u5982\u679c\u8981\u652f\u6301\u52bf\u5fc5\u662f\u5927\u9762\u79ef\u66f4\u6362\uff0c\u6210\u672c\u4f1a\u975e\u5e38\u5927\uff0c\u90a3\u5982\u679c\u4e00\u4e2a\u6570\u636e\u5305<\/span>9000<\/span>\u5927\u5c0f\u7ecf\u8fc7\u4e00\u4e2a<\/span>MTU<\/span>\u662f\u6807\u51c6<\/span>1500<\/span>\u7684\u8bbe\u5907\uff0c\u90a3\u52bf\u5fc5\u5c31\u4f1a\u9020\u6210\u5206\u7247\u4e86\uff0c\u8fd8\u6709\u8bb8\u591a\u6bd4\u5982\u8d85\u957f\u5e27\u4f1a\u9020\u6210\u5ef6\u65f6\u3001<\/span>CRC<\/span>\u9519\u8bef\u53d8\u591a\u7b49\u95ee\u9898\uff0c\u5bfc\u81f4\u81f3\u4eca\u65e0\u6cd5\u5927\u9762\u79ef\u666e\u53ca\u4f7f\u7528\u7684\u4e3b\u8981\u539f\u56e0\u3002<\/span><\/span><\/p>\n

          \u00a0<\/span><\/p>\n

          \uff08<\/span>4<\/span>\uff09<\/span>IP<\/span>\u5206\u7247\u540e\u4e3a\u4ec0\u4e48\u4f1a\u9020\u6210\u5ef6\u8fdf\u8ddf\u6548\u7387\u4f4e\u5462\uff1f<\/span><\/span><\/strong><\/p>\n

          \u00a0<\/span><\/p>\n

          <\/div><\/p>\n

          \u00a0<\/span><\/p>\n

          \u62d6\u4e24\u53f0\u7535\u8111\uff0c\u5206\u522b\u8bbe\u7f6e\u597d\u5730\u5740<\/span>\uff0c\u7136\u540e\u6293\u5305\u6765\u770b\u770b\u5206\u7247\u7684\u60c5\u51b5\u3002<\/span><\/p>\n

          \u00a0<\/span><\/p>\n

          <\/div><\/p>\n

          \u00a0<\/span><\/p>\n

          \u8bf4\u4e0b\u547d\u4ee4\uff0cPing 192.168.255.2\u8fd9\u4e2a\u90fd\u80fd\u591f\u77e5\u9053\u5565\u610f\u601d\uff0c-l\u8868\u793aICMP\u7684\u6570\u636e\u90e8\u5206\uff08\u4e0d\u542b\u5176\u5b83\u4efb\u4f55\u5934\u90e8\u4fe1\u606f\uff09\u4e3a1473\uff0c-c 1\u53ea\u53d1\u9001\u4e00\u6b21\u3002<\/span><\/p>\n

          \u00a0<\/span><\/p>\n

          \u00a0<\/span><\/p>\n

          <\/div><\/p>\n

          \u00a0<\/span><\/p>\n

          \u901a\u8fc7\u6293\u5305\uff0c\u53ef\u4ee5\u770b\u5230\u6709\u51e0\u4e2a\u4fe1\u606f\uff08wireshark<\/span>\u5347\u7ea7\u4e86\u4e0b\uff0c\u754c\u9762\u770b\u8d77\u6765\u66f4\u7f8e\u89c2\u4e86~\uff09<\/span><\/p>\n

            \n
          • ARP<\/span>\uff1a\u8fd9\u4e2a\u662f\u83b7\u53d6\u5bf9\u65b9IP<\/span>\u5bf9\u5e94\u7684MAC<\/span><\/span><\/li>\n
          • ICMP<\/span>\uff0c\u8fd9\u4e2a\u662f\u6b63\u5e38\u7684ICMP<\/span>\u534f\u8bae\u7684\u62a5\u6587<\/span><\/li>\n
          • IP Fragmented<\/span>\uff1aIP<\/span>\u5206\u7247\u5305<\/span><\/li>\n<\/ul>\n

            \u00a0<\/span><\/p>\n

            \u6709IP<\/span>\u5206\u7247\u5305\u51fa\u73b0\uff0c\u8bf4\u660e\u521a\u521a\u7684\u6570\u636e\u5305\u6574\u4f53\u8d85\u8fc71500<\/span>\u4e2a\u5b57\u8282\u4e86\u3002<\/span><\/p>\n

            \u00a0<\/span><\/p>\n

              \n
            • \u6570\u636e\u660e\u660e\u662f<\/span>1473<\/span>\u600e\u4e48\u5c31\u8d85\u8fc7<\/span>1500<\/span>\u5b57\u8282\u4e86\u5462\uff1f<\/span><\/span><\/li>\n<\/ul>\n

              \u8fd9\u91cc\u8981\u6ce8\u610f\uff0c1473<\/span>\u8868\u660e\u7684\u662fICMP<\/span>\u6570\u636e\u90e8\u5206\u7684\u5927\u5c0f\uff0c\u4e0d\u8ba1\u7b97\u5934\u90e8\u5728\u5185\uff0c\u90a3\u4e48\u52a0\u4e0a\u5934\u90e8\u540e\u5462\uff1f\u00a0 1473+8\uff08ICMP\u5934\u90e8\uff09+20\uff08IP\u5934\u90e8\uff09=1501\uff0c\u8fd9\u6837\u6b63\u597d\u8d85\u8fc7\u4e861500\u4e2a\u5b57\u8282\uff0c\u6240\u4ee5\u5bfc\u81f4\u5206\u7247\u4e86\u3002MTU\u662f\u4e8c\u5c42<\/span>\u6982\u5ff5\uff0c\u4e8c\u5c42\u4ee5\u4e0a\u7684\u5934\u90e8\u52a0\u6570\u636e\u4e0d\u80fd\u8d85\u8fc71500\uff0c\u5426\u5219\u4f1a\u8fdb\u884c\u5206\u7247\u3002<\/span><\/p>\n

              \u00a0<\/span><\/p>\n

                \n
              • \u4ece192.168.255.1\u5230192.168.255.2\u4e3a\u4ec0\u4e48\u53ea\u6709\u4e00\u4e2a\u5206\u7247\u5305<\/span><\/li>\n<\/ul>\n

                \u00a0<\/span><\/p>\n

                \u00a0<\/span><\/p>\n

                <\/div><\/p>\n

                \u00a0<\/span><\/p>\n

                \u8fd9\u91cc\u5bf9\u4e8e\u521a\u63a5\u89e6\u6293\u5305\u7684\u670b\u53cb\u6765\u8bf4\uff0c\u53ef\u80fd\u6709\u70b9\u770b\u4e0d\u61c2\uff0c\u6211\u4eec\u6765\u770b\u51e0\u4e2a\u53c2\u6570<\/span><\/p>\n

                  \n
                1. IP<\/span>\u5934\u90e8\u91cc\u9762\u6709\u4e00\u4e2aidentification \u8fd9\u4e2a\u662f\u6807\u8bc6\u7b26\uff0c\u5206\u7247\u7684\u5305\u4f1a\u6253\u4e0a\u76f8\u540c\u7684\u5305\uff0c\u65b9\u4fbf\u76ee\u7684\u7aef\u533a\u5206<\/span><\/span><\/li>\n
                2. Flags<\/span>\u91cc\u9762\u7684<\/span>MF<\/span>\u4f4d\u662f<\/span>1<\/span>\uff0c\u8868\u793a\u8fd9\u4e2a\u4e0d\u662f\u6700\u540e\u4e00\u4e2a\u5305\uff0c\u5982\u679c\u662f\u6700\u540e\u4e00\u4e2a\u5305\u4f1a\u4e3a<\/span>0<\/span><\/span><\/li>\n
                3. offset\uff1a\u504f\u79fb\u7b26\uff0c\u8868\u793a\u6570\u636e\u5305\u7684\u4f4d\u7f6e\uff0c\u8fd9\u4e2a\u4e3a0\uff0c\u8868\u793a\u662f\u7b2c\u4e00\u4e2a\u5206\u7247\u5305<\/span><\/li>\n
                4. Data\uff1a\u4f60\u8fd9\u91cc\u4f1a\u53d1\u73b0\u6570\u636e\u662f1480\uff0c\u5e76\u4e14\u662f\u6ca1\u6709ICMP\u5934\u90e8\u7684\uff08\u8fd9\u4e2a\u5185\u5bb9\u5176\u5b9e\u662f\u5305\u542b\u4e86\u5934\u90e8\u4fe1\u606f\u7684\uff0c1480-8\uff0c1472\uff0c<\/span>\u6ce8\u610f\uff1a\u53ea\u6709\u7b2c\u4e00\u4e2a\u5206\u7247\u4f1a\u643a\u5e26\u5934\u90e8\u4fe1\u606f\uff0c\u6293\u5305\u6ca1\u6709\u663e\u793a\u51fa\u6765<\/span>\uff09\u3002<\/span><\/span><\/li>\n<\/ol>\n

                  \u00a0<\/span><\/p>\n

                  \u90a3\u8fd8\u6709<\/span>1<\/span>\u4e2a\u5b57\u8282\u7684\u5305\u5728\u6293\u5305\u91cc\u9762\u6ca1\u6709\u663e\u793a\uff0c\u8fd9\u53ef\u80fd\u662f\u6293\u5305\u4e2d\u628a\u5c3e\u5305\u7701\u7565\u4e86\uff0c\u4f46\u662f\u53ef\u4ee5\u4ece\u53e6\u5916\u4e00\u4e2a\u5730\u65b9\u770b\u51fa\u6765\u3002<\/span><\/span><\/p>\n

                  \u00a0<\/span><\/p>\n

                  <\/div><\/p>\n

                  \u00a0<\/span><\/p>\n

                  \u5728\u770b\u4e00\u4e2a\u5b8c\u6574\u7684\u5305\u53ef\u4ee5\u4e0a\u9762\u7684\u7591\u60d1\u4e86<\/span><\/p>\n

                    \n
                  1. IP<\/span>\u5934\u90e8\u91cc\u9762\u6709\u4e00\u4e2aidentification \u8fd9\u4e2a\u662f\u6807\u8bc6\u7b26\uff0c\u5206\u7247\u7684\u5305\u4f1a\u6253\u4e0a\u76f8\u540c\u7684\u5305\uff0c\u65b9\u4fbf\u76ee\u7684\u7aef\u533a\u5206<\/span><\/span><\/li>\n
                  2. \u6293\u5305\u8f6f\u4ef6\u91cc\u9762\u6709\u4e00\u4e2a<\/span>IPV4 Fragments<\/span>\u7684\u7ec4\u5408\u89e3\u6790\uff0c\u53d1\u73b0\u6709\u4e24\u4e2a\u5206\u7247\uff0c<\/span>Frame<\/span>\uff1a<\/span>3<\/span>\uff0c\u6570\u636e\u8d1f\u8f7d\u662f<\/span>0<\/span>~1479\uff081480\u4e2a\u5b57\u8282\uff09\uff0cFrame\uff1a4\uff0c\u6570\u636e\u8d1f\u8f7d\u662f1480-1481\uff081\u4e2a\u5b57\u8282\uff09\uff0c\u603b\u5171\u5c31\u662f1481<\/span><\/span><\/li>\n
                  3. DATA\u90e8\u5206\u4e3a1473\uff0c\u662f\u56e0\u4e3a1481\u91cc\u9762\u67098\u4e2a\u5b57\u8282\u7684\u5934\u90e8\uff0c1481-8=1473\u4e2a\u5b57\u8282<\/span><\/li>\n<\/ol>\n

                    \u00a0<\/span><\/p>\n

                      \n
                    • \u4e3a\u4ec0\u4e48\u4f1a\u5f71\u54cd\u6548\u7387\u8ddf\u589e\u52a0\u5ef6\u8fdf\u5462\uff1f<\/span><\/li>\n<\/ul>\n

                      \n

                      <\/div><\/p>\n

                      \n

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                      \u00a0<\/span><\/p>\n

                      \uff085\uff09\u600e\u4e48\u8bbe\u7f6e\u5408\u9002\u7684MTU\u5462<\/span><\/strong><\/p>\n

                      \u00a0\u00a0\u00a0 \u7531\u4e8e\u73b0\u5728\u5f88\u591a\u534f\u8bae\u8fd8\u6ca1\u5b66\u4e60\uff0c\u4e0d\u540c\u7684\u5e94\u7528\u5bf9\u5e94\u7684\u5934\u90e8\u4e0d\u4e00\u6837\uff0c\u81ea\u7136\u5305\u542b\u7684\u5185\u5bb9\u4e5f\u4e0d\u4e00\u6837\uff0c\u8fd9\u4e2a\u4f1a\u968f\u7740\u540e\u9762\u5b66\u4e60\u7684\u6df1\u5165\uff0c\u6162\u6162\u7684\u4e86\u89e3\uff0c\u8bbe\u7f6e\u5408\u9002\u7684MTU\u53ef\u4ee5\u7528Windows\u81ea\u5e26\u7684\u547d\u4ee4\u53ef\u4ee5\u63a2\u6d4b\uff0c\u6bd4\u5982\u67d0\u4e2a\u5e94\u7528\u6709\u95ee\u9898\uff0c\u901a\u8fc7\u6293\u5305\u53d1\u73b0\u53d1\u9001\u7684\u6570\u636e\u8d85\u8fc7\u4e86MTU\u7684\u5927\u5c0f\uff0c\u5c31\u53ef\u4ee5\u9002\u5f53\u7684\u8c03\u6574\u3002<\/span><\/p>\n

                      \u00a0<\/span><\/p>\n

                      <\/div><\/p>\n

                      \u00a0<\/span><\/p>\n

                      ping\u547d\u4ee4\u91cc\u9762\u5e26\u6709\u4e00\u4e2a\u53c2\u6570-f \u5b83\u53ef\u4ee5\u628aIP\u5305\u7684DF\u4f4d\u7f6e1\uff0c\u8ba9\u5176\u4e0d\u5206\u7247\uff0c\u90a3\u4e48\u8d85\u8fc7MTU\u9700\u8981\u5206\u7247\u7684\u8bbe\u5907\u53d1\u73b0DF\u4f4d\u7f6e\u4e00\uff0c\u5219\u76f4\u63a5\u4e22\u5f03\uff0c\u8fd4\u56de\u4e00\u4e2aICMP\u7684\u5dee\u9519\u62a5\u6587\u7ed3\u679c\uff0c\u901a\u8fc7\u8fd9\u6837\u6765\u6d4b\u8bd5\u51fa\u4e00\u4e2a\u5408\u9002\u7684MTU\u503c\u3002<\/span><\/p>\n

                      \n

                      \u7559\u4e00\u4e2a\u5c0f\u7591\u95ee<\/span><\/p>\n

                      \u8fd9\u91cc\u4e3a\u4ec0\u4e48<\/span>1464<\/span>\u5c31\u53ef\u4ee5\uff0c<\/span>1465<\/span>\u4e0d\u53ef\u4ee5\u5462\uff08\u8be5\u73af\u5883\u5b58\u5728\u62e8\u53f7\uff09<\/span><\/span><\/p>\n

                      \u201c\u627f\u4e0a\u542f\u4e0b\u201d<\/span><\/p>\n

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