trcertroute\u5efa\u7acb\u4e00\u4e2aUDP\u6570\u636e\u5305\uff0c\u4e0d\u65ad\u4fee\u6539TTL\u503c\u5e76\u53d1\u9001\u51fa\u53bb\uff0c\u5982\u679c\u6536\u5230\u201c\u8d85\u65f6\u9519\u201d\uff0c\u8868\u793a\u521a\u521a\u5230\u8fbe\u7684\u662f\u8def\u7531\u5668\uff0c\u800c\u5982\u679c\u6536\u5230\u7684\u662f\u201c\u7aef\u53e3\u4e0d\u53ef\u8fbe\u201d\u9519\u8bef\uff0c\u8868\u793a\u521a\u521a\u5230\u8fbe\u7684\u5c31\u662f\u76ee\u7684\u4e3b\u673a\u3002\u8fd9\u6837\u8def\u7531\u8ddf\u8e2a\u5b8c\u6210\uff0c\u7a0b\u5e8f\u7ed3\u675f\u3002
\n==========================================================================
\n Traceroute\u7a0b\u5e8f\u7684\u8bbe\u8ba1\u662f\u5229\u7528ICMP\u53caIP header\u7684TTL\uff08Time To Live\uff09\u680f\u4f4d\uff08field\uff09\u3002\u9996\u5148\uff0ctraceroute\u9001\u51fa\u4e00\u4e2aTTL\u662f1\u7684IP datagram\uff08\u5176\u5b9e\uff0c\u6bcf\u6b21\u9001\u51fa\u7684\u4e3a3\u4e2a40\u5b57\u8282\u7684\u5305\uff0c\u5305\u62ec\u6e90\u5730\u5740\uff0c\u76ee\u7684\u5730\u5740\u548c\u5305\u53d1\u51fa\u7684\u65f6\u95f4\u6807\u7b7e\uff09\u5230\u76ee\u7684\u5730\uff0c\u5f53\u8def\u5f84\u4e0a\u7684\u7b2c\u4e00\u4e2a\u8def\u7531\u5668\uff08router\uff09\u6536\u5230\u8fd9\u4e2adatagram\u65f6\uff0c\u5b83\u5c06TTL\u51cf1\u3002\u6b64\u65f6\uff0cTTL\u53d8\u4e3a0\u4e86\uff0c\u6240\u4ee5\u8be5\u8def\u7531\u5668\u4f1a\u5c06\u6b64datagram\u4e22\u6389\uff0c\u5e76\u9001\u56de\u4e00\u4e2a\u300cICMP time exceeded\u300d\u6d88\u606f\uff08\u5305\u62ec\u53d1IP\u5305\u7684\u6e90\u5730\u5740\uff0cIP\u5305\u7684\u6240\u6709\u5185\u5bb9\u53ca\u8def\u7531\u5668\u7684IP\u5730\u5740\uff09\uff0ctraceroute \u6536\u5230\u8fd9\u4e2a\u6d88\u606f\u540e\uff0c\u4fbf\u77e5\u9053\u8fd9\u4e2a\u8def\u7531\u5668\u5b58\u5728\u4e8e\u8fd9\u4e2a\u8def\u5f84\u4e0a\uff0c\u63a5\u7740traceroute \u518d\u9001\u51fa\u53e6\u4e00\u4e2aTTL\u662f2 \u7684datagram\uff0c\u53d1\u73b0\u7b2c2 \u4e2a\u8def\u7531\u5668…… traceroute \u6bcf\u6b21\u5c06\u9001\u51fa\u7684datagram\u7684TTL \u52a01\u6765\u53d1\u73b0\u53e6\u4e00\u4e2a\u8def\u7531\u5668\uff0c\u8fd9\u4e2a\u91cd\u590d\u7684\u52a8\u4f5c\u4e00\u76f4\u6301\u7eed\u5230\u67d0\u4e2adatagram \u62b5\u8fbe\u76ee\u7684\u5730\u3002\u5f53datagram\u5230\u8fbe\u76ee\u7684\u5730\u540e\uff0c\u8be5\u4e3b\u673a\u5e76\u4e0d\u4f1a\u9001\u56deICMP time exceeded\u6d88\u606f\uff0c\u56e0\u4e3a\u5b83\u5df2\u662f\u76ee\u7684\u5730\u4e86\uff0c\u90a3\u4e48traceroute\u5982\u4f55\u5f97\u77e5\u76ee\u7684\u5730\u5230\u8fbe\u4e86\u5462\uff1f<\/p>\n
Traceroute\u5728\u9001\u51faUDP datagrams\u5230\u76ee\u7684\u5730\u65f6\uff0c\u5b83\u6240\u9009\u62e9\u9001\u8fbe\u7684port number \u662f\u4e00\u4e2a\u4e00\u822c\u5e94\u7528\u7a0b\u5e8f\u90fd\u4e0d\u4f1a\u7528\u7684\u53f7\u7801\uff0830000 \u4ee5\u4e0a\uff09\uff0c\u6240\u4ee5\u5f53\u6b64UDP datagram \u5230\u8fbe\u76ee\u7684\u5730\u540e\u8be5\u4e3b\u673a\u4f1a\u9001\u56de\u4e00\u4e2a\u300cICMP port unreachable\u300d\u7684\u6d88\u606f\uff0c\u800c\u5f53traceroute \u6536\u5230\u8fd9\u4e2a\u6d88\u606f\u65f6\uff0c\u4fbf\u77e5\u9053\u76ee\u7684\u5730\u5df2\u7ecf\u5230\u8fbe\u4e86\u3002\u6240\u4ee5traceroute \u5728Server\u7aef\u4e5f\u662f\u6ca1\u6709\u6240\u8c13\u7684Daemon \u7a0b\u5f0f\u3002<\/p>\n
Traceroute\u63d0\u53d6\u53d1 ICMP TTL\u5230\u671f\u6d88\u606f\u8bbe\u5907\u7684IP\u5730\u5740\u5e76\u4f5c\u57df\u540d\u89e3\u6790\u3002\u6bcf\u6b21 \uff0cTraceroute\u90fd\u6253\u5370\u51fa\u4e00\u7cfb\u5217\u6570\u636e,\u5305\u62ec\u6240\u7ecf\u8fc7\u7684\u8def\u7531\u8bbe\u5907\u7684\u57df\u540d\u53ca IP\u5730\u5740,\u4e09\u4e2a\u5305\u6bcf\u6b21\u6765\u56de\u6240\u82b1\u65f6\u95f4\u3002<\/p>\n
Traceroute \u6709\u4e00\u4e2a\u56fa\u5b9a\u7684\u65f6\u95f4\u7b49\u5f85\u54cd\u5e94(ICMP TTL\u5230\u671f\u6d88\u606f)\u3002\u5982\u679c\u8fd9\u4e2a\u65f6\u95f4\u8fc7\u4e86\uff0c\u5b83\u5c06\u6253\u5370\u51fa\u4e00\u7cfb\u5217\u7684*\u53f7\u8868\u660e\uff1a\u5728\u8fd9\u4e2a\u8def\u5f84\u4e0a\uff0c\u8fd9\u4e2a\u8bbe\u5907\u4e0d\u80fd\u5728\u7ed9\u5b9a\u7684\u65f6\u95f4\u5185\u53d1\u51faICMP TTL\u5230\u671f\u6d88\u606f\u7684\u54cd\u5e94\u3002\u7136\u540e\uff0cTraceroute\u7ed9TTL\u8bb0\u6570\u5668\u52a01\uff0c\u7ee7\u7eed\u8fdb\u884c\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
trcertroute\u5efa\u7acb\u4e00\u4e2aUDP\u6570\u636e\u5305\uff0c\u4e0d\u65ad\u4fee\u6539TTL\u503c\u5e76\u53d1\u9001\u51fa\u53bb\uff0c\u5982\u679c\u6536\u5230\u201c\u8d85\u65f6\u9519\u201d\uff0c\u8868\u793a\u521a\u521a\u5230\u8fbe\u7684\u662f\u8def […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_crdt_document":"","footnotes":""},"categories":[],"tags":[],"class_list":["post-951","post","type-post","status-publish","format-standard","hentry"],"_links":{"self":[{"href":"https:\/\/www.mudone.com\/index.php?rest_route=\/wp\/v2\/posts\/951","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.mudone.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.mudone.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.mudone.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.mudone.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=951"}],"version-history":[{"count":1,"href":"https:\/\/www.mudone.com\/index.php?rest_route=\/wp\/v2\/posts\/951\/revisions"}],"predecessor-version":[{"id":1254,"href":"https:\/\/www.mudone.com\/index.php?rest_route=\/wp\/v2\/posts\/951\/revisions\/1254"}],"wp:attachment":[{"href":"https:\/\/www.mudone.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=951"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.mudone.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=951"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.mudone.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=951"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}