![\"\"](\"https:\/\/www.zhuyanbin.com\/wp-content\/uploads\/2015\/12\/1.png\")
<\/a><\/p>\n\u8fde\u63a5VPN\u540e\uff0cping http:\/\/<\/span>google.com<\/span><\/i><\/a> \u6b63\u5e38\uff0cnslookup \u4e5f\u6b63\u5e38\uff0c\u4e0d\u77e5\u9053\u6539\u600e\u4e48\u8c03\u8bd5\u4e86\uff0c\u6c42\u89e3.<\/p>\n <\/p>\n MTU\uff0c\u82f1\u6587\u5168\u79f0\u4e3aMaximum Transmission Unit\uff0c\u4e2d\u6587\u5373\u6700\u5927\u4f20\u8f93\u5355\u5143\u7684\u610f\u601d\uff0c\u662f\u4e00\u79cd\u901a\u4fe1\u534f\u8bae\u5c42\u4e0a\u6240\u80fd\u901a\u8fc7\u7684\u6700\u5927\u6570\u636e\u5305\u503c\u3002\u5982\u679cMTU\u8bbe\u7f6e<\/u><\/a>\u5f97\u5f53\uff0c\u53ef\u4ee5\u4f18\u5316\u7f51\u7edc\u6027\u80fd\u3002\u53cd\u4e4b\u8bbe\u7f6e<\/u><\/a>\u4e0d\u5f53\uff0c\u5219\u53ef\u80fd\u5f71\u54cd\u7f51\u7edc\u901f\u5ea6\u3001\u751a\u81f3\u5f71\u54cd\u90e8\u5206\u8f6f\u4ef6\u548c\u7f51\u7edc\u4f7f\u7528\u3002\u6bd4\u5982\u8fde\u63a5\u4e0aVPN\u4e0d\u80fd\u8bbf\u95ee\u7f51\u7ad9\uff0c\u6216\u4e0d\u80fd\u8fde\u63a5\u7b49\u95ee\u9898\u3002<\/p>\n \u7531\u4e8eVPN\u8fde\u63a5\u9700\u8981\u5bf9\u539f\u6709\u7684IP\u6216\u8005\u662fTCP\/UDP\u6570\u636e\u8fdb\u884c\u5c01\u88c5\uff0c\u56e0\u6b64\u589e\u52a0\u4e86\u6570\u636e\u7684\u957f\u5ea6\u3002\u5982\u679cVPN\u8fde\u63a5\u4e0a\u4e0d\u80fd\u4e0a\u7f51\uff0c\u53ef\u4ee5\u5c06MTU\u8bbe\u7f6e\u5c0f\u4e00\u4e9b\uff0c\u6bd4\u59821450\uff0c\u5177\u4f53\u8bbe\u7f6e\u65b9\u6cd5\u53ef\u4ee5\u53c2\u8003\u4e0b\u6587\u4ecb\u7ecd\u3002<\/p>\n \u9664\u4e86MTU\u7684\u8bbe\u7f6e\u53ef\u80fd\u5f71\u54cdVPN\u8fde\u63a5\u4f7f\u7528\u5916\uff0c\u5982\u679c\u8bbe\u7f6e\u4e0d\u5408\u7406\uff0c\u4e5f\u53ef\u80fd\u5f71\u54cd\u7f51\u7edc\u8fde\u63a5\u8d28\u91cf\u3002\u73b0\u5728\u5e38\u7528\u7684\u4ee5\u592a\u7f51\u7f51\u7edc\u4e0b\uff0cMTU\u503c\u9ed8\u8ba4\u662f1500\uff0c\u8d85\u8fc7\u6b64\u5927\u5c0f\u7684\u8bdd\uff0c\u6570\u636e\u5305\u5c06\u88ab\u5206\u6bb5\u4f20\u8f93\u3002\u5982\u679cMTU\u8fc7\u5c0f\u7684\u8bdd\uff0c\u4f1a\u589e\u52a0\u6570\u636e\u5305\u62c6\u5206\u4f20\u8f93\u6b21\u6570\uff0c\u800c\u4e14\u62c6\u5305\u7ec4\u5305\u7684\u8fc7\u7a0b\u4e5f\u6d6a\u8d39\u4e86\u65f6\u95f4\u3002<\/p>\n \u90a3\u4e48\u6309\u4e0a\u6240\u8bf4\uff0c\u662f\u4e0d\u662f\u8bbe\u7f6e\u6700\u5927\u503c\u6700\u597d\u5462\uff1f\u7b54\u6848\u662f\u5426\u5b9a\u7684\uff0c\u56e0\u4e3a\u5728\u4e0d\u540c\u4f7f\u7528\u7f51\u7edc\u73af\u5883\uff0c\u7f51\u7edcMTU\u6700\u5927\u503c\u4e5f\u53ef\u80fd\u4e0d\u4e00\u6837\u3002\u6bd4\u5982ADSL\u7f51\u7edcMTU\u503c\u662f1492\u5b57\u8282\uff0c\u5982\u679c\u5f3a\u884c\u8bbe\u7f6e\u4e3a1500\uff0c\u56e0\u4e3a\u7f51\u7edc\u672c\u8eab\u6700\u5927\u53ea\u80fd1492\uff0c\u8d85\u8fc7\u7684\u8bdd\uff0c\u4f20\u8f93\u524d\u5c31\u9700\u8981\u62c6\u5305\u5206\u6bb5\u4f20\u8f93\uff0c\u5728\u8fd9\u8fc7\u7a0b\u4e2d\u4e5f\u6d6a\u8d39\u4e86\u65f6\u95f4\uff0c\u5e76\u4e14\u4ea7\u751f\u989d\u5916\u7684\u6570\u636e\u5305\u3002<\/p>\n \u6240\u4ee5MTU\u8bbe\u7f6e\u9700\u8981\u6070\u5f53\uff0c\u4e0d\u80fd\u8fc7\u5927\u4e5f\u4e0d\u80fd\u8fc7\u5c0f\uff0c\u6839\u636e\u7f51\u7edc\u672c\u8eab\u6700\u5927MTU\u4f20\u8f93\u5b57\u8282\u8bbe\u7f6e\u5373\u53ef\u3002\u90a3\u4e48\u5982\u4f55\u67e5\u770b\u4f7f\u7528\u7f51\u7edc\u7684\u6700\u5927MTU\u503c\u5462\uff0c\u4e0b\u9762\u5c06\u4ecb\u7ecd\u4e00\u4e0b\u68c0\u67e5\u65b9\u6cd5\uff08Windows\u4e0b\u624b\u52a8\u67e5\u8be2\uff0c\u5982\u679c\u89c9\u5f97\u9ebb\u70e6\uff0c\u4e5f\u53ef\u4ee5\u4f7f\u7528Simple MTU Test\u8fd9\u4e2a\u8f6f\u4ef6\u67e5\u8be2\uff09\u3002<\/p>\n \u4e00\u3001\u7f51\u7edc\u6700\u5927MTU\u503c\u68c0\u6d4b\u65b9\u6cd5<\/strong><\/p>\n 1\u3001\u9996\u5148\u540c\u65f6\u6309\u4e0b\u952e\u76d8\u4e0a\u7684Win+R\u952e\uff0c\u5f39\u51fa\u201c\u8fd0\u884c\u201d\u7a97\u53e3\uff0c\u8f93\u5165\u201dcmd.exe\u201d\uff0c\u70b9\u51fb\u786e\u5b9a\u3002<\/p>\n 2\u3001\u5728\u547d\u4ee4\u884c\u7a97\u53e3\u4e2d\u8f93\u5165\u201dping -l 1472 -f www.baidu.com\u201d\u7136\u540e\u6309\u4e0b\u56de\u8f66\u952e\u3002\u89e3\u91ca\u4e00\u4e0b\u8fd9\u6bb5\u547d\u4ee4\u7684\u4f5c\u7528\uff1a<\/p>\n ping\uff1a\u53d1\u9001\u4e00\u4e2a\u6570\u636e\u5305\u68c0\u6d4b\uff1b 3\u3001\u6267\u884c\u4ee5\u4e0a\u547d\u4ee4\u540e\uff0c\u5982\u679c\u6210\u529f\u54cd\u5e94\u4e86\uff08\u5982\u4e0b\u56fe\uff09\uff0c\u5219\u8bf4\u660e\u4f60\u7684\u7f51\u7edcMTU\u6700\u5927\u4e3a1500\u5b57\u8282\uff0c\u8fd9\u65f6\u8bbe\u7f6eMTU\u4e3a1500\u5373\u53ef\u3002\uff08\u8fd9\u91cc\u6211\u4fee\u6539\u4e86\u68c0\u6d4b\u6570\u636e\u5305\u4e3a1450\uff0c\u65b9\u4fbf\u622a\u56fe\uff09<\/p>\n 4\u3001\u5982\u679c\u8fd4\u56de\u663e\u793a\u9700\u8981\u62c6\u5206\u6570\u636e\u5305\u4f46\u662f\u8bbe\u7f6e DF\u3002\u6216\u662fPacker needs to be fragmented but DF set.\u7684\u63d0\u793a\uff0c\u5219\u8bf4\u660e\u6570\u636e\u5305\u5927\u5c0f\u8d85\u8fc7\u4e86\u672c\u8eab\u7f51\u7edc\u6700\u5927MTU\u503c\u3002<\/p>\n 5\u3001\u8fd9\u65f6\u53ef\u4ee5\u51cf\u5c0f\u53d1\u9001\u6570\u636e\u5305\u5927\u5c0f\u518d\u5c1d\u8bd5\uff0c\u4f9d\u6b21\u51cf\u5c115\u5b57\u8282\uff0c\u76f4\u5230\u80fd\u6b63\u786e\u8fd4\u56de\u54cd\u5e94\u3002\u8fd4\u56de\u540e\u9010\u6e10\u52a01\u5b57\u8282\u518d\u6b21\u68c0\u6d4b\uff0c\u4ee5\u67e5\u8be2\u7f51\u7edc\u6700\u5927MTU\u503c\u3002\u6bd4\u5982\u67e5\u8be2\u7f51\u7edc\u6700\u5927MTU\u503c\u4e3a1452\uff0c\u90a3\u4e48\u8fd9\u4e2a\u5e76\u4e0d\u662f\u5b8c\u6574\u7684MTU\u503c\uff0c\u8fd8\u9700\u8981\u52a0\u4e0a28\u5b57\u8282\u7684\u6570\u636e\u5305\u62a5\u6587\uff08\u5305\u542bIP\u5934\u90e8\uff0c\u4f46\u4e0d\u5305\u542b\u534f\u8bae\u6808\u66f4\u4e0b\u5c42\u7684\u5934\u90e8\uff09\uff0c\u5b8c\u6574\u7684MTU\u5e94\u8be5\u662f1480\u5b57\u8282\u3002<\/p>\n 6\u3001\u67e5\u8be2\u5230\u7f51\u7edc\u6700\u5927MTU\u503c\u540e\uff0c\u8bbe\u7f6e\u5373\u53ef\u3002\u8def\u7531\u5668\u8bbe\u7f6e\u7684\u8bdd\uff0c\u4e0d\u540c\u8def\u7531\u5668\uff0c\u8bbe\u7f6e\u65b9\u6cd5\u4e5f\u53ef\u80fd\u4e0d\u4e00\u6837\uff0c\u5efa\u8bae\u67e5\u770b\u4f7f\u7528\u8bf4\u660e\u8bbe\u7f6e\u3002TP-LINK\u8def\u7531\u5668\u7684\u8bdd\uff0c\u4e00\u822c\u662f\u5728\u7ba1\u7406\u9875\u9762\u2014\u2014\u7f51\u7edc\u53c2\u6570\u2014\u2014WAN\u53e3\u8bbe\u7f6e\u2014\u2014\u7f16\u8f91\u6b63\u5728\u4f7f\u7528\u7684\u7f51\u7edc\u8fde\u63a5\u2014\u2014WAN\u53e3\u9ad8\u7ea7\u8bbe\u7f6e\u91cc\u3002<\/p>\n 7\u3001\u5f53\u7136\u9664\u4e86\u76f4\u63a5\u5728\u8def\u7531\u5668\u8bbe\u7f6e\u5916\uff0c\u8fd8\u53ef\u4ee5\u5728\u64cd\u4f5c\u7cfb\u7edf\u91cc\u4fee\u6539\uff0c\u4e0b\u9762\u5c06\u4ecb\u7ecd\u4e00\u4e0b\u5404\u7cfb\u7edf\u8bbe\u7f6e\u65b9\u6cd5\u3002<\/p>\n \u4e8c\u3001Windows\u7cfb\u7edf\u8bbe\u7f6eMTU\u65b9\u6cd5<\/strong><\/p>\n \u9664\u4e86\u4e0b\u9762\u4ecb\u7ecd\u7684\u624b\u52a8\u8bbe\u7f6e\u65b9\u6cd5\u5916\uff0c\u4e00\u4e9b\u8f6f\u4ef6\u4e5f\u6709\u8f85\u52a9\u4fee\u6539\u529f\u80fd\uff0c\u6bd4\u5982\u9b54\u65b9\u4f18\u5316\u5927\u5e08\u7b49\u3002<\/p>\n A\u3001Vista\u3001Win7\u3001Win8\u7cfb\u7edf\u8bbe\u7f6e\u65b9\u6cd5<\/strong><\/p>\n 1\u3001\u6253\u5f00\u7cfb\u7edf\u76d8\\Windows\\System32\\\u6587\u4ef6\u5939\u4e0b\u627e\u5230cmd.exe\uff0c\u53f3\u952e\u201c\u4ee5\u7ba1\u7406\u5458\u8eab\u4efd\u8fd0\u884c\u201d\uff1b<\/p>\n 2\u3001\u5728\u201c\u547d\u4ee4\u63d0\u793a\u7b26\u201d\u7a97\u53e3\u4e2d\u8f93\u5165\u201cnetsh interface ipv4 show subinterfaces\u201d\u5e76\u56de\u8f66\u67e5\u770b\u5f53\u524d\u7684MTU\u503c\uff1b<\/p>\n 3\u3001\u63a5\u4e0b\u6765\u8f93\u5165\u201cnetsh interface ipv4 set subinterface \u201c\u4fee\u6539\u7684\u7f51\u7edc\u8fde\u63a5\u540d\u201d mtu=\u67e5\u8be2\u7684\u7f51\u7edc\u6700\u5927MTU\u503c store=persistent\u201d\u5e76\u56de\u8f66\u5373\u53ef\uff1b<\/p>\n \u4f8b\u5982\uff1a\u201cnetsh interface ipv4 set subinterface \u201c\u672c\u5730\u8fde\u63a5\u201d mtu=1492 store=persistent\u201d\u3002<\/p>\n B\u3001Windows XP\u7cfb\u7edf\u8bbe\u7f6e\u65b9\u6cd5<\/strong><\/p>\n 1\u3001 \u6309\u4e0bWin+R\u7ec4\u5408\u952e\uff0c\u5f39\u51fa\u201c\u8fd0\u884c\u201d\u7a97\u53e3\uff0c\u8f93\u5165regedit\uff0c\u70b9\u51fb\u786e\u5b9a\uff1b<\/p>\n 2\u3001\u4f9d\u6b21\u627e\u5230\u4ee5\u4e0b\u6ce8\u518c\u8868\u9879\uff1a\u201cHKEY_Local_Machine\u2014\u2014SYSTEM\u2014\u2014CurrentControlSet\u2014\u2014Services\u2014\u2014Tcpip\u2014\u2014Parameters\u2014\u2014interface\u201d\uff1b<\/p>\n 3\u3001\u5728interface\u4e2d\u4e0b\u53ef\u80fd\u6709\u5f88\u591a\u9879\uff0c\u9700\u8981\u9010\u4e2a\u89c2\u5bdf\u952e\u503c\uff0c\u4f1a\u6709\u4e00\u4e2a\u9879\u4e0e\u4f60\u7684\u7f51\u5361IP\u4e00\u81f4\uff0c\u9009\u4e2d\u8be5\u9879\uff1b<\/p>\n 4\u3001\u7136\u540e\u5728\u8be5\u9879\u4e0a\u70b9\u51fb\u53f3\u952e\uff0c\u9009\u62e9\u201c\u7f16\u8f91\u2014\u2014\u65b0\u5efa\u2014\u2014DWORD\u503c\u201d\uff0c\u7136\u540e\u5728\u53f3\u4fa7\u5c06\u5176\u547d\u540d\u4e3a\u201cMTU\u201d\uff1b<\/p>\n 5\u3001\u53f3\u952e\u70b9\u51fbMTU\uff0c\u9009\u62e9\u201c\u4fee\u6539\u201d\uff0c\u5728\u5f39\u51fa\u7684\u7a97\u53e3\u4e2d\u9009\u62e9\u201c\u5341\u8fdb\u5236\u201d\uff0c\u8bbe\u7f6e\u4f60\u67e5\u8be2\u7f51\u7edcMTU\u503c\u5373\u53ef\u3002<\/p>\n 6\u3001\u8bbe\u7f6e\u540e\uff0c\u9700\u8981\u91cd\u542f\u7535\u8111\u5e94\u7528\u751f\u6548\u3002<\/p>\n \u4e09\u3001Mac OS X\u8bbe\u7f6eMTU\u65b9\u6cd5<\/strong><\/p>\n \u4f9d\u6b21\u6253\u5f00\uff1a\u7cfb\u7edf\u504f\u597d\u8bbe\u7f6e\u2014\u2014\u7f51\u7edc\u2014\u2014\u4ee5\u592a\u7f51\uff08\u5982\u679c\u4f7f\u7528\u7684\u662f\u65e0\u7ebf\u7f51\u7edc\u5c31\u4fee\u6539\u65e0\u7ebf\u7f51\u7edc\uff09\u2014\u2014\u9ad8\u7ea7\u8bbe\u7f6e\uff0c\u5728\u201c\u786c\u4ef6\u201d\u9009\u9879\u5361\u4e0b\u201c\u914d\u7f6e\u201d\u9009\u62e9\u624b\u52a8\uff0c\u7136\u540e\u5c31\u53ef\u4ee5\u8bbe\u7f6eMTU\u4e86\uff0c\u5982\u4e0b\u56fe\uff1a<\/p>\n \u5728Linode\u7684VPS\u4e0a\u914d\u7f6e\u4e86VPN\u670d\u52a1\u5668\uff08pptpd\uff09\uff0c\u8fde\u63a5\u6b63\u5e38\u3002\u5728\u6211\u81ea\u5df1\u7684Mac\u7535\u8111\u4e0a\u8fde\u63a5\u4ee5\u540e\u65e0\u6cd5\u8bbf\u95eeGo …<\/span> Read More →<\/span><\/a><\/span><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-156","post","type-post","status-publish","format-standard","hentry","category-mac"],"_links":{"self":[{"href":"https:\/\/www.yanbin888.com\/index.php?rest_route=\/wp\/v2\/posts\/156","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.yanbin888.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.yanbin888.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.yanbin888.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.yanbin888.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=156"}],"version-history":[{"count":4,"href":"https:\/\/www.yanbin888.com\/index.php?rest_route=\/wp\/v2\/posts\/156\/revisions"}],"predecessor-version":[{"id":266,"href":"https:\/\/www.yanbin888.com\/index.php?rest_route=\/wp\/v2\/posts\/156\/revisions\/266"}],"wp:attachment":[{"href":"https:\/\/www.yanbin888.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=156"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.yanbin888.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=156"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.yanbin888.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=156"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}<\/a><\/p>\n
\n-l\uff08L\u7684\u5c0f\u5199\uff09\uff1a\u6307\u5b9a\u6570\u636e\u5305\u5927\u5c0f\uff1b
\n1472\uff1a\u6570\u636e\u5305\u5927\u5c0f\u4e3a1472\u5b57\u8282\uff1b
\n-f\uff1a\u7981\u6b62\u8def\u7531\u5668\u62c6\u5206\u6570\u636e\u5305\uff1b
\nwww.baidu.com\uff1a\u4f7f\u7528\u767e\u5ea6\u4e3a\u68c0\u6d4b\u76ee\u6807\uff1b<\/p>\n<\/a><\/p>\n<\/a><\/p>\n<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"