{"id":189,"date":"2016-07-04T15:21:33","date_gmt":"2016-07-04T15:21:33","guid":{"rendered":""},"modified":"2016-07-04T15:21:33","modified_gmt":"2016-07-04T15:21:33","slug":"","status":"publish","type":"post","link":"http:\/\/weizn.net\/?p=189","title":{"rendered":"wireshark\u6293\u53d6\u5230TCP\u5305\u540e\u4e00\u4e9bInfo\u4fe1\u606f\u8bf4\u660e"},"content":{"rendered":"<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_17 counter-hierarchy\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\">\u76ee\u5f55<\/p>\n<span class=\"ez-toc-title-toggle\"><a class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" style=\"display: none;\"><i class=\"ez-toc-glyphicon ez-toc-icon-toggle\"><\/i><\/a><\/span><\/div>\n<nav><ul class=\"ez-toc-list ez-toc-list-level-1\"><li class=\"ez-toc-page-1 ez-toc-heading-level-3\"><a class=\"ez-toc-link ez-toc-heading-1\" href=\"http:\/\/weizn.net\/?p=189\/#TCP%E7%89%87%E6%AE%B5%E4%B8%A2%E5%A4%B1\" title=\"\n\tTCP\u7247\u6bb5\u4e22\u5931 \n\">\n\tTCP\u7247\u6bb5\u4e22\u5931 \n<\/a><\/li><li class=\"ez-toc-page-1 ez-toc-heading-level-3\"><a class=\"ez-toc-link ez-toc-heading-2\" href=\"http:\/\/weizn.net\/?p=189\/#%E8%B6%85%E6%97%B6%E9%87%8D%E6%96%B0%E5%8F%91%E9%80%81\" title=\"\n\t\u8d85\u65f6\u91cd\u65b0\u53d1\u9001 \n\">\n\t\u8d85\u65f6\u91cd\u65b0\u53d1\u9001 \n<\/a><\/li><li class=\"ez-toc-page-1 ez-toc-heading-level-3\"><a class=\"ez-toc-link ez-toc-heading-3\" href=\"http:\/\/weizn.net\/?p=189\/#%E5%BF%AB%E9%80%9F%E9%87%8D%E6%96%B0%E5%8F%91%E9%80%81\" title=\"\n\t\u5feb\u901f\u91cd\u65b0\u53d1\u9001 \n\">\n\t\u5feb\u901f\u91cd\u65b0\u53d1\u9001 \n<\/a><\/li><li class=\"ez-toc-page-1 ez-toc-heading-level-3\"><a class=\"ez-toc-link ez-toc-heading-4\" href=\"http:\/\/weizn.net\/?p=189\/#%E6%80%BB%E7%BB%93\" title=\"\n\t\u603b\u7ed3 \n\">\n\t\u603b\u7ed3 \n<\/a><\/li><\/ul><\/nav><\/div>\n<p>\n\t<strong><span style=\"font-size:14px;\"><span style=\"font-size:14px;\">\u4e00\u3001<\/span><span style=\"font-size:14px;\">TCP Dup ACK<\/span><\/span><\/strong>\n<\/p>\n<p>\n\t<span style=\"font-size:14px;\">&nbsp;&nbsp;&nbsp;&nbsp;\u4e00\u822c\u6765\u8bf4\u662f\u7f51\u7edc\u62e5\u585e\u5bfc\u81f4\u4e22\u5305\uff0c\u6bd4\u5982\u53d1\u9001\u65b9\u7684\u62a5\u6587\u5230\u8fbe\u4e0d\u4e86\u63a5\u6536\u65b9\uff0c\u63a5\u53d7\u65b9\u6536\u4e0d\u5230\u9884\u671f\u5e8f\u5217\u53f7\u7684\u62a5\u6587\u5c31\u4f1a\u53d1\u9001dup ack\u7ed9\u53d1\u9001\u65b9\uff0c\u53d1\u9001\u65b9\u6536\u52303\u4e2adup ack\u5c31\u4f1a\u5feb\u901f\u91cd\u4f20\u800c\u4e0d\u5fc5\u7b49\u8d85\u65f6\u5b9a\u65f6\u5668\u3002<\/span>\n<\/p>\n<p>\n\t<span style=\"font-size:14px;\">&nbsp;&nbsp;&nbsp;&nbsp;https:\/\/ask.wireshark.org\/questions\/29216\/why-are-duplicate-tcp-acks-being-seen-in-wireshark-capture\/29225<\/span>\n<\/p>\n<p>\n\t\n<\/p>\n<p>\n\t<strong><span style=\"font-size:14px;\">\u4e8c\u3001TCP Retransmission<\/span><\/strong>\n<\/p>\n<h3 style=\"margin:1em 0px 0.5em;padding:0px;white-space:normal;widows:auto;position:relative;text-shadow:rgba(0, 0, 0, 0.4) 0px -1px 1px;line-height:40px;border-bottom-width:1px;border-bottom-style:solid;border-bottom-color:rgba(53, 86, 129, 0.298039);\"><span class=\"ez-toc-section\" id=\"TCP%E7%89%87%E6%AE%B5%E4%B8%A2%E5%A4%B1\"><\/span>\n\t<span style=\"font-size:14px;\">TCP\u7247\u6bb5\u4e22\u5931<\/span><br \/>\n<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p style=\"margin:10px auto;padding:0px;line-height:24px;white-space:normal;widows:auto;\">\n\t<span style=\"font-size:14px;\">&nbsp;<\/span><img decoding=\"async\" alt=\"\" src=\"http:\/\/www.weizn.net\/content\/uploadfile\/201607\/25ffd4cb28e4132a3c953154c812dbac20160704143858.png\" style=\"margin:0px auto;padding:0px;max-width:90%;height:auto;display:block;\" \/>\n<\/p>\n<p style=\"margin:10px auto;padding:0px;line-height:24px;white-space:normal;widows:auto;text-align:center;\">\n\t<span style=\"font-size:14px;\">TCP\u5934\u90e8\u7684checksum<\/span>\n<\/p>\n<p style=\"margin:10px auto;padding:0px;line-height:24px;white-space:normal;widows:auto;\">\n\t<span style=\"font-size:14px;\">&nbsp;&nbsp;&nbsp;&nbsp;<\/span><span style=\"font-size:14px;\">\u63a5\u6536\u65b9(receiver)\u53ef\u4ee5\u901a\u8fc7\u6821\u9a8cTCP\u7247\u6bb5\u5934\u90e8\u4e2dchecksum\u533a\u57df\u6765\u68c0\u9a8cTCP\u7247\u6bb5\u662f\u5426\u51fa\u9519\u3002IP\u534f\u8bae\u7684checksum\u53ea\u6821\u9a8c\u5934\u90e8\uff0cTCP\u7247\u6bb5\u5934\u90e8\u7684checksum\u4f1a\u6821\u9a8c\u5305\u62ecIP\u5934\u90e8\u3001TCP\u5934\u90e8\u548cTCP\u6570\u636e\u5728\u5185\u7684\u6574\u4e2a\u5e8f\u5217\uff0c\u786e\u4fddIP\u5730\u5740\u3001\u7aef\u53e3\u53f7\u548c\u5176\u4ed6\u76f8\u5173\u4fe1\u606f\u6b63\u786e\u3002\u5982\u679cTCP\u7247\u6bb5\u51fa\u9519\uff0c\u63a5\u6536\u65b9\u53ef\u4ee5\u7b80\u5355\u7684\u4e22\u5f03\u6539TCP\u7247\u6bb5\uff0c\u4e5f\u5c31\u76f8\u5f53\u4e8eTCP\u7247\u6bb5\u4e22\u5931\u3002<\/span>\n<\/p>\n<p style=\"margin:10px auto;padding:0px;line-height:24px;white-space:normal;widows:auto;\">\n\t<span style=\"font-size:14px;\">&nbsp;&nbsp;&nbsp;&nbsp;<\/span><span style=\"font-size:14px;\">TCP\u7247\u6bb5\u5305\u88f9\u5728\u4e00\u4e2aIP\u5305\u4e2d\u4f20\u8f93\u3002IP\u5305\u53ef\u80fd\u5728\u7f51\u7edc\u4e2d\u4e22\u5931\u3002\u5bfc\u81f4IP\u5305\u4e22\u5931\u7684\u539f\u56e0\u53ef\u80fd\u6709\u5f88\u591a\uff0c\u6bd4\u5982IP\u5305\u7ecf\u8fc7\u592a\u591a\u7684\u8def\u7531\u5668\u63a5\u529b\uff0c\u8fbe\u5230hop limit\uff1b\u6bd4\u5982\u8def\u7531\u5668\u592a\u8fc7\u62e5\u6324\uff0c\u5bfc\u81f4\u4e00\u4e9bIP\u5305\u88ab\u4e22\u5f03\uff1b\u518d\u6bd4\u5982\u8def\u7531\u8868(routing table)\u6ca1\u6709\u53ca\u65f6\u66f4\u65b0\uff0c\u5bfc\u81f4IP\u5305\u65e0\u6cd5\u9001\u8fbe\u76ee\u7684\u5730\u3002<\/span>\n<\/p>\n<p style=\"margin:10px auto;padding:0px;line-height:24px;white-space:normal;widows:auto;\">\n\t<span style=\"widows:auto;\"><span style=\"font-size:14px;\">&nbsp;&nbsp;&nbsp;&nbsp;<\/span><span style=\"font-size:14px;\">\u4e0b\u9762\u6211\u4eec\u8981\u4ecb\u7ecd\u4e24\u79cd\u91cd\u65b0\u53d1\u9001TCP\u7247\u6bb5\u7684\u673a\u5236\uff1a\u8d85\u65f6\u91cd\u65b0\u53d1\u9001\u548c\u5feb\u901f\u91cd\u65b0\u53d1\u9001\u3002&nbsp;<\/span><\/span>\n<\/p>\n<h3 style=\"margin:1em 0px 0.5em;padding:0px;white-space:normal;widows:auto;position:relative;text-shadow:rgba(0, 0, 0, 0.4) 0px -1px 1px;line-height:40px;border-bottom-width:1px;border-bottom-style:solid;border-bottom-color:rgba(53, 86, 129, 0.298039);\"><span class=\"ez-toc-section\" id=\"%E8%B6%85%E6%97%B6%E9%87%8D%E6%96%B0%E5%8F%91%E9%80%81\"><\/span>\n\t<span style=\"font-size:14px;\">\u8d85\u65f6\u91cd\u65b0\u53d1\u9001<\/span><br \/>\n<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p style=\"margin:10px auto;padding:0px;line-height:24px;white-space:normal;widows:auto;\">\n\t<span style=\"font-size:14px;\">&nbsp;&nbsp;&nbsp;&nbsp;<\/span><span style=\"font-size:14px;\">\u6211\u4eec\u4e4b\u524d\u5df2\u7ecf\u7b80\u5355\u4ecb\u7ecd\u8fc7\u91cd\u65b0\u53d1\u9001\u7684\u673a\u5236\uff1a\u5f53\u53d1\u9001\u65b9\u9001\u51fa\u4e00\u4e2aTCP\u7247\u6bb5\u540e\uff0c\u5c06\u5f00\u59cb\u8ba1\u65f6\uff0c\u7b49\u5f85\u8be5TCP\u7247\u6bb5\u7684ACK\u56de\u590d\u3002\u5982\u679c\u63a5\u6536\u65b9\u6b63\u786e\u63a5\u6536\u5230\u7b26\u5408\u6b21\u5e8f\u7684\u7247\u6bb5\uff0c\u63a5\u6536\u65b9\u4f1a\u5229\u7528ACK\u7247\u6bb5\u56de\u590d\u53d1\u9001\u65b9\u3002\u53d1\u9001\u65b9\u5f97\u5230ACK\u56de\u590d\u540e\uff0c\u7ee7\u7eed\u79fb\u52a8\u7a97\u53e3\uff0c\u53d1\u9001\u63a5\u4e0b\u6765\u7684TCP\u7247\u6bb5\u3002\u5982\u679c\u76f4\u5230\u8ba1\u65f6\u5b8c\u6210\uff0c\u53d1\u9001\u65b9\u8fd8\u662f\u6ca1\u6709\u6536\u5230ACK\u56de\u590d\uff0c\u90a3\u4e48\u53d1\u9001\u65b9\u63a8\u65ad\u4e4b\u524d\u53d1\u9001\u7684TCP\u7247\u6bb5\u4e22\u5931\uff0c\u56e0\u6b64\u91cd\u65b0\u53d1\u9001\u4e4b\u524d\u7684TCP\u7247\u6bb5\u3002\u8fd9\u4e2a\u8ba1\u65f6\u7b49\u5f85\u7684\u65f6\u95f4\u53eb\u505a\u91cd\u65b0\u53d1\u9001\u8d85\u65f6\u65f6\u95f4(RTO, retransmission timeout)\u3002<\/span>\n<\/p>\n<p style=\"margin:10px auto;padding:0px;line-height:24px;white-space:normal;widows:auto;\">\n\t<span style=\"font-size:14px;\">&nbsp;&nbsp;&nbsp;&nbsp;<\/span><span style=\"font-size:14px;\">\u53d1\u9001\u65b9\u5e94\u8be5\u5728\u7b49\u5f85\u591a\u957f\u65f6\u95f4\u4e4b\u540e\u91cd\u65b0\u53d1\u9001\u5462\uff1f\u8fd9\u662f\u91cd\u65b0\u53d1\u9001\u7684\u6838\u5fc3\u95ee\u9898\u3002\u4e0a\u8ff0\u8fc7\u7a0b\u5b9e\u9645\u4e0a\u6709\u5f80\u8fd4\u4e24\u4e2a\u65b9\u5411\uff1a1. \u53d1\u9001\u7247\u6bb5\u4ece\u53d1\u9001\u65b9\u5230\u63a5\u6536\u65b9\u7684\u4f20\u8f93\uff0c2. ACK\u7247\u6bb5\u4ece\u63a5\u6536\u65b9\u5230\u53d1\u9001\u65b9\u7684\u4f20\u8f93\u3002\u6574\u4e2a\u8fc7\u7a0b\u5b9e\u9645\u8017\u8d39\u7684\u65f6\u95f4\u79f0\u505a\u5f80\u8fd4\u65f6\u95f4(RTT, round trip time)\u3002\u5982\u679cRTT\u662f\u56fa\u5b9a\u7684\uff0c\u6bd4\u59821\u79d2\uff0c\u90a3\u4e48\u6211\u4eec\u53ef\u4ee5\u8ba9RTO\u7b49\u4e8eRTT\u3002\u4f46\u5b9e\u9645\u4e0a\uff0cRTT\u7684\u4e0a\u4e0b\u6d6e\u52a8\u5f88\u5927\u3002\u6bd4\u5982\u67d0\u4e2a\u65f6\u523b\uff0c\u7f51\u7edc\u4e2d\u6709\u8bb8\u591a\u4ea4\u901a\uff0c\u90a3\u4e48RTT\u5c31\u589e\u52a0\u3002\u5728RTT\u6d6e\u52a8\u7684\u60c5\u51b5\u4e0b\uff0c\u5982\u679c\u6211\u4eec\u8bbe\u7f6e\u4e86\u8fc7\u5c0f\u7684RTO\uff0c\u90a3\u4e48TCP\u4f1a\u7b49\u5f85\u5f88\u77ed\u7684\u65f6\u95f4\u4e4b\u540e\u91cd\u65b0\u53d1\u9001\uff0c\u800c\u5b9e\u9645\u4e0a\u4e4b\u524d\u53d1\u9001\u7684\u7247\u6bb5\u5e76\u6ca1\u6709\u4e22\u5931\uff0c\u53ea\u662f\u4f20\u8f93\u901f\u5ea6\u6bd4\u8f83\u6162\u800c\u5df2\uff0c\u8fd9\u6837\uff0c\u7f51\u7edc\u4e2d\u5c31\u88ab\u91cd\u590d\u6ce8\u5165TCP\u7247\u6bb5\uff0c\u4ece\u800c\u6d6a\u8d39\u7f51\u7edc\u4f20\u8f93\u8d44\u6e90\u3002\u53e6\u4e00\u65b9\u9762\uff0c\u5982\u679cRTO\u65f6\u95f4\u8fc7\u957f\uff0c\u90a3\u4e48\u5f53TCP\u7247\u6bb5\u5df2\u7ecf\u5b9e\u9645\u4e22\u5931\u7684\u60c5\u51b5\u4e0b\uff0c\u53d1\u9001\u65b9\u4e0d\u80fd\u53ca\u65f6\u91cd\u65b0\u53d1\u9001\uff0c\u4f1a\u9020\u6210\u7f51\u7edc\u8d44\u6e90\u7684\u95f2\u7f6e\u3002\u6240\u4ee5\uff0cRTO\u5fc5\u987b\u7b26\u5408\u5f53\u524d\u7f51\u7edc\u7684\u4f7f\u7528\u72b6\u51b5\u3002\u7f51\u7edc\u72b6\u51b5\u8d8a\u597d\uff0cRTO\u5e94\u8be5\u8d8a\u77ed\uff1b\u7f51\u7edc\u72b6\u51b5\u8d8a\u5dee\uff0cRTO\u5e94\u8be5\u8d8a\u957f\u3002<\/span>\n<\/p>\n<p style=\"margin:10px auto;padding:0px;line-height:24px;white-space:normal;widows:auto;\">\n\t<span style=\"font-size:14px;\">&nbsp;<\/span><img decoding=\"async\" alt=\"\" src=\"http:\/\/www.weizn.net\/content\/uploadfile\/201607\/fa8ca5e7b30357955ccb8bfd223eafb220160704143858.jpg\" style=\"margin:0px auto;padding:0px;max-width:90%;height:auto;display:block;\" \/>\n<\/p>\n<p style=\"margin:10px auto;padding:0px;line-height:24px;white-space:normal;widows:auto;text-align:center;\">\n\t<span style=\"font-size:14px;\">RTT: \u5f80\u8fd4\u65f6\u95f4<\/span>\n<\/p>\n<p style=\"margin:10px auto;padding:0px;line-height:24px;white-space:normal;widows:auto;\">\n\t<span style=\"font-size:14px;\">&nbsp;&nbsp;&nbsp;&nbsp;<\/span><span style=\"font-size:14px;\">TCP\u534f\u8bae\u901a\u8fc7\u7edf\u8ba1RTT\uff0c\u6765\u51b3\u5b9a\u5408\u7406\u7684RTO\u3002\u53d1\u9001\u65b9\u53ef\u4ee5\u6d4b\u91cf\u6bcf\u4e00\u6b21TCP\u4f20\u8f93\u7684RTT (\u4ece\u53d1\u9001\u51fa\u6570\u636e\u7247\u6bb5\u5f00\u59cb\uff0c\u5230\u63a5\u6536\u5230ACK\u7247\u6bb5\u4e3a\u6b62)\uff0c\u8fd9\u6837\u7684\u6bcf\u6b21\u6d4b\u91cf\u5f97\u5230\u7684\u5f80\u8fd4\u65f6\u95f4\uff0c\u53eb\u505a\u91c7\u6837RTT(srtt, sampling round trip time)\u3002\u5efa\u7acb\u8fde\u63a5\u4e4b\u540e\uff0c\u6bcf\u6b21\u7684srtt\u4f5c\u4e3a\u91c7\u6837\u6837\u672c\uff0c\u8ba1\u7b97\u5e73\u5747\u503c(mean)\u548c\u6807\u51c6\u5dee(standard deviation)\uff0c\u5e76\u8ba9RTO\u7b49\u4e8esrtt\u5e73\u5747\u503c\u52a0\u4e0a\u56db\u500d\u7684srtt\u6807\u51c6\u5dee\u3002<\/span>\n<\/p>\n<p style=\"margin:10px auto;padding:0px;line-height:24px;white-space:normal;widows:auto;text-align:center;\">\n\t<span style=\"font-size:14px;\">RTO = mean + 4 std<\/span>\n<\/p>\n<p style=\"margin:10px auto;padding:0px;line-height:24px;white-space:normal;widows:auto;\">\n\t<span style=\"font-size:14px;\">(\u4e0a\u8ff0\u7b97\u6cd5\u6709\u591a\u4e2a\u53d8\u79cd\uff0c\u6839\u636e\u5e73\u53f0\u4e0d\u540c\u6709\u6240\u53d8\u5316)<\/span>\n<\/p>\n<p style=\"margin:10px auto;padding:0px;line-height:24px;white-space:normal;widows:auto;\">\n\t<span style=\"font-size:14px;\">&nbsp;&nbsp;&nbsp;&nbsp;<\/span><span style=\"font-size:14px;\">\u5e73\u5747\u503c\u53cd\u6620\u4e86\u5e73\u5747\u610f\u4e49\u4e0a\u7684RTT\uff0c\u5e73\u5747\u5f80\u8fd4\u65f6\u95f4\u8d8a\u5927\uff0cRTO\u8d8a\u5927\u3002\u53e6\u4e00\u65b9\u9762\uff0c\u6807\u51c6\u5dee\u8d8a\u5927\u4e5f\u4f1a\u5f71\u54cdRTO\u3002\u6807\u51c6\u5dee\u4ee3\u8868\u4e86RTT\u6837\u672c\u7684\u79bb\u6563\u7a0b\u5ea6\u3002\u5982\u679cRTT\u4e0a\u4e0b\u5267\u70c8\u6d6e\u52a8\uff0c\u6807\u51c6\u5dee\u6bd4\u8f83\u5927\u3002RTT\u6d6e\u52a8\u5927\uff0c\u8bf4\u660e\u5f53\u524d\u7f51\u7edc\u72b6\u51b5\u76f8\u5bf9\u4e0d\u7a33\u5b9a\u3002\u56e0\u6b64\u8981\u8bbe\u7f6e\u66f4\u957f\u7684RTO\uff0c\u4ee5\u5e94\u5bf9\u4e0d\u7a33\u5b9a\u7684\u7f51\u7edc\u72b6\u51b5\u3002<\/span>\n<\/p>\n<h3 style=\"margin:1em 0px 0.5em;padding:0px;white-space:normal;widows:auto;position:relative;text-shadow:rgba(0, 0, 0, 0.4) 0px -1px 1px;line-height:40px;border-bottom-width:1px;border-bottom-style:solid;border-bottom-color:rgba(53, 86, 129, 0.298039);\"><span class=\"ez-toc-section\" id=\"%E5%BF%AB%E9%80%9F%E9%87%8D%E6%96%B0%E5%8F%91%E9%80%81\"><\/span>\n\t<span style=\"font-size:14px;\">\u5feb\u901f\u91cd\u65b0\u53d1\u9001<\/span><br \/>\n<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p style=\"margin:10px auto;padding:0px;line-height:24px;white-space:normal;widows:auto;\">\n\t<span style=\"font-size:14px;\">&nbsp;&nbsp;&nbsp;&nbsp;<\/span><span style=\"font-size:14px;\">\u6211\u4eec\u521a\u624d\u4ecb\u7ecd\u4e86\u8d85\u65f6\u91cd\u65b0\u53d1\u9001\u7684\u673a\u5236\uff1a\u53d1\u9001\u65b9\u9001\u51fa\u4e00\u4e2aTCP\u7247\u6bb5\uff0c\u7136\u540e\u5f00\u59cb\u7b49\u5f85\u5e76\u8ba1\u65f6\uff0c\u5982\u679cRTO\u65f6\u95f4\u4e4b\u540e\u8fd8\u6ca1\u6709\u6536\u5230ACK\u56de\u590d\uff0c\u53d1\u9001\u65b9\u5219\u91cd\u65b0\u53d1\u9001\u3002TCP\u534f\u8bae\u6709\u53ef\u80fd\u5728\u8ba1\u65f6\u5b8c\u6210\u4e4b\u524d\u542f\u52a8\u91cd\u65b0\u53d1\u9001\uff0c\u4e5f\u5c31\u662f\u5229\u7528\u5feb\u901f\u91cd\u65b0\u53d1\u9001(fast-retransmission)\u3002\u5feb\u901f\u53d1\u9001\u673a\u5236\u5982\u679c\u88ab\u542f\u52a8\uff0c\u5c06\u6253\u65ad\u8ba1\u65f6\u5668\u7684\u7b49\u5f85\uff0c\u76f4\u63a5\u91cd\u65b0\u53d1\u9001TCP\u7247\u6bb5\u3002<\/span>\n<\/p>\n<p style=\"margin:10px auto;padding:0px;line-height:24px;white-space:normal;widows:auto;\">\n\t<span style=\"font-size:14px;\">&nbsp;&nbsp;&nbsp;&nbsp;<\/span><span style=\"font-size:14px;\">\u7531\u4e8eIP\u5305\u7684\u4f20\u8f93\u662f\u65e0\u5e8f\u7684\uff0c\u6240\u4ee5\u63a5\u6536\u65b9\u6709\u53ef\u80fd\u5148\u6536\u5230\u540e\u53d1\u51fa\u7684\u7247\u6bb5\uff0c\u4e5f\u5c31\u662f\u4e71\u5e8f(out-of-order)\u7247\u6bb5\u3002\u4e71\u5e8f\u7247\u6bb5\u7684\u5e8f\u53f7\u5e76\u4e0d\u7b49\u4e8e\u6700\u8fd1\u53d1\u51fa\u7684ACK\u56de\u590d\u53f7\u3002\u5df2\u63a5\u6536\u7684\u6587\u672c\u6d41\u548c\u4e71\u5e8f\u7247\u6bb5\u4e4b\u95f4\u5c06\u51fa\u73b0\u7a7a\u6d1e(hole)\uff0c\u4e5f\u5c31\u662f\u7b49\u5f85\u63a5\u6536\u7684\u7a7a\u4f4d\u3002\u6bd4\u5982\u5df2\u7ecf\u63a5\u6536\u4e86\u6b63\u5e38\u7247\u6bb55,6,7\uff0c\u6b64\u65f6\u53c8\u63a5\u6536\u4e71\u5e8f\u7247\u6bb59\u3002\u8fd9\u65f6\u7247\u6bb58\u4f9d\u7136\u7a7a\u7f3a\uff0c\u7247\u6bb58\u7684\u4f4d\u7f6e\u5c31\u662f\u4e00\u4e2a\u7a7a\u6d1e\u3002<\/span>\n<\/p>\n<p style=\"margin:10px auto;padding:0px;line-height:24px;white-space:normal;widows:auto;\">\n\t<span style=\"widows:auto;\"><span style=\"font-size:14px;\">&nbsp;&nbsp;&nbsp;&nbsp;<\/span><span style=\"font-size:14px;\">TCP\u534f\u8bae\u89c4\u5b9a\uff0c\u5f53\u63a5\u6536\u65b9\u6536\u5230\u4e71\u5e8f\u7247\u6bb5\u7684\u65f6\u5019\uff0c\u9700\u8981\u91cd\u590d\u53d1\u9001ACK\u3002\u6bd4\u5982\u63a5\u6536\u5230\u4e71\u5e8f\u7247\u6bb59\u7684\u65f6\u5019\uff0c\u63a5\u6536\u65b9\u9700\u8981\u56de\u590dACK\u3002\u56de\u590d\u53f7\u4e3a8 (7+1)\u3002\u6b64\u540e\u63a5\u6536\u65b9\u5982\u679c\u7ee7\u7eed\u6536\u5230\u4e71\u5e8f\u7247\u6bb5(\u5e8f\u53f7\u4e0d\u662f8\u7684\u7247\u6bb5)\uff0c\u5c06\u518d\u6b21\u91cd\u590d\u53d1\u9001ACK=8\u3002\u5f53\u53d1\u9001\u65b9\u6536\u52303\u4e2aACK=8\u7684\u56de\u590d\u65f6\uff0c\u53d1\u9001\u65b9\u63a8\u65ad\u7247\u6bb58\u4e22\u5931\u3002\u5373\u4f7f\u6b64\u65f6\u7247\u6bb58\u7684\u8ba1\u65f6\u5668\u8fd8\u6ca1\u6709\u8d85\u65f6\uff0c\u53d1\u9001\u65b9\u4f1a\u6253\u65ad\u8ba1\u65f6\uff0c\u76f4\u63a5\u91cd\u65b0\u53d1\u9001\u7247\u6bb58\uff0c\u8fd9\u5c31\u662f\u5feb\u901f\u91cd\u65b0\u53d1\u9001\u673a\u5236(fast-retransmission)\u3002<\/span><\/span>\n<\/p>\n<p style=\"margin:10px auto;padding:0px;line-height:24px;white-space:normal;widows:auto;\">\n\t<span style=\"font-size:14px;\">&nbsp;&nbsp;&nbsp;&nbsp;<\/span><span style=\"font-size:14px;\">\u5feb\u901f\u91cd\u65b0\u53d1\u9001\u673a\u5236\u5229\u7528\u91cd\u590d\u7684ACK\u6765\u63d0\u793a\u7a7a\u6d1e\u7684\u5b58\u5728\u3002\u5f53\u91cd\u590d\u6b21\u6570\u8fbe\u5230\u9608\u503c\u65f6\uff0c\u8ba4\u4e3a\u7a7a\u6d1e\u5bf9\u5e94\u7684\u7247\u6bb5\u5728\u7f51\u7edc\u4e2d\u4e22\u5931\u3002\u5feb\u901f\u91cd\u65b0\u53d1\u9001\u673a\u5236\u63d0\u9ad8\u4e86\u68c0\u6d4b\u4e22\u5931\u7247\u6bb5\u7684\u6548\u7387\uff0c\u5f80\u5f80\u53ef\u4ee5\u5728\u8d85\u65f6\u4e4b\u524d\u63a2\u6d4b\u5230\u4e22\u5931\u7247\u6bb5\uff0c\u5e76\u91cd\u590d\u53d1\u9001\u4e22\u5931\u7684\u7247\u6bb5\u3002<\/span>\n<\/p>\n<h3 style=\"margin:1em 0px 0.5em;padding:0px;white-space:normal;widows:auto;position:relative;text-shadow:rgba(0, 0, 0, 0.4) 0px -1px 1px;line-height:40px;border-bottom-width:1px;border-bottom-style:solid;border-bottom-color:rgba(53, 86, 129, 0.298039);\"><span class=\"ez-toc-section\" id=\"%E6%80%BB%E7%BB%93\"><\/span>\n\t<span style=\"font-size:14px;\">\u603b\u7ed3<\/span><br \/>\n<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p style=\"margin:10px auto;padding:0px;line-height:24px;white-space:normal;widows:auto;\">\n\t<span style=\"font-size:14px;\">&nbsp;&nbsp;&nbsp;&nbsp;<\/span><span style=\"font-size:14px;\">TCP\u534f\u8bae\u5229\u7528\u91cd\u65b0\u53d1\u9001(retransmission)\u6765\u5b9e\u73b0TCP\u4f20\u8f93\u7684\u53ef\u9760\u6027\u3002\u91cd\u65b0\u53d1\u9001\u7684\u57fa\u672c\u5f62\u5f0f\u662f\u8d85\u65f6\u91cd\u65b0\u53d1\u9001\uff0c\u6839\u636e\u7edf\u8ba1\u7684\u5f80\u8fd4\u65f6\u95f4\u6765\u8bbe\u7f6e\u8d85\u65f6\u6807\u51c6\uff1b\u5982\u679c\u8d85\u65f6\uff0c\u5219\u91cd\u65b0\u53d1\u9001TCP\u7247\u6bb5\u3002\u53e6\u4e00\u65b9\u9762\uff0c\u5feb\u901f\u91cd\u65b0\u53d1\u9001\u5219\u901a\u8fc7\u4e71\u5e8f\u7247\u6bb5\u7684ACK\u6765\u66f4\u65e9\u7684\u63a8\u65ad\u51fa\u7247\u6bb5\u7684\u4e22\u5931\u3002<\/span>\n<\/p>\n<p style=\"margin:10px auto;padding:0px;line-height:24px;white-space:normal;widows:auto;\">\n\t\n<\/p>\n<p style=\"margin:10px auto;padding:0px;line-height:24px;white-space:normal;widows:auto;\">\n\t<strong><span style=\"font-size:14px;\">\u4e09\u3001<\/span><\/strong><strong><span style=\"font-size:14px;\">TCP segment of a reassembled PDU<\/span><\/strong>\n<\/p>\n<p style=\"margin:10px auto;padding:0px;line-height:24px;white-space:normal;widows:auto;\">\n\t<span style=\"font-size:14px;\">&nbsp;&nbsp;&nbsp;&nbsp;<\/span><span style=\"font-size:14px;\">\u5728WireShark\u4e2d\u7ecf\u5e38\u53ef\u4ee5\u770b\u5230\u6709TCP segment of a reassembled PDU\u51fa\u73b0\uff0cTCP segment of a reassembled PDU\u6307TCP\u5c42\u6536\u5230\u4e0a\u5c42\u5927\u5757\u62a5\u6587\u540e\u5206\u89e3\u6210\u6bb5\u540e\u53d1\u51fa\u53bb\u3002\u8fd9\u4e2a\u662f\u7531TCP\u7684MSS(Maximum Segment Size\uff0c\u6700\u5927\u62a5\u6587\u6bb5\u957f\u5ea6)\u51b3\u5b9a\u7684\uff0cTCP\u5728\u53d1\u8d77\u8fde\u63a5\u7684\u7b2c\u4e00\u4e2a\u62a5\u6587\u7684TCP\u5934\u91cc\u901a\u8fc7MSS\u8fd9\u4e2a\u53ef\u9009\u9879\u544a\u77e5\u5bf9\u65b9\u672c\u7aef\u80fd\u591f\u63a5\u6536\u7684\u6700\u5927\u62a5\u6587\uff08\u5f53\u7136\uff0c\u8fd9\u4e2a\u5927\u5c0f\u662fTCP\u51c0\u8377\u7684\u5927\u5c0f\uff09\uff0c\u4ee5\u592a\u7f51\u4e0a\u8fd9\u4e2a\u503c\u4e00\u822c\u8bbe\u7f6e\u62101460\uff0c\u56e0\u4e3a1460Byte\u51c0\u8377+20Byte TCP\u5934+20Byte IP\u5934 \uff1d 1500\u5b57\u8282\uff0c\u6b63\u597d\u7b26\u5408\u94fe\u8def\u5c42\u6700\u5927\u62a5\u6587\u7684\u8981\u6c42\u3002<\/span><br \/>\n<span style=\"font-size:14px;\">&nbsp;&nbsp;&nbsp;&nbsp;<\/span><span style=\"font-size:14px;\">\u5982\u4f55\u5224\u65ad\u6536\u5230\u7684\u62a5\u6587\u662f\u4e00\u4e2a&#8221;TCP segment&#8221;\uff1f\u5982\u679c\u6709\u51e0\u4e2a\u62a5\u6587\u7684ACK\u5e8f\u53f7\u90fd\u4e00\u6837\uff0c\u5e76\u4e14\u8fd9\u4e9b\u62a5\u6587\u7684Sequence Number\u90fd\u4e0d\u4e00\u6837\uff0c\u5e76\u4e14\u540e\u4e00\u4e2aSequence Number\u4e3a\u524d\u4e00\u4e2aSequence Number\u52a0\u4e0a\u524d\u4e00\u4e2a\u62a5\u6587\u5927\u5c0f\u518d\u52a0\u4e0a1\u7684\u8bdd\uff0c\u80af\u5b9a\u662fTCP segment\u4e86\uff0c\u5bf9\u4e8e\u6ca1\u6709ACK\u6807\u5fd7\u65f6\uff0c\u5219\u65e0\u6cd5\u5224\u65ad\u3002<\/span><br \/>\n<span style=\"font-size:14px;\"><\/span><\/p>\n","protected":false},"excerpt":{"rendered":"<p>\n\t<strong><span style=\"font-size:14px;\">\u4e00\u3001TCP Fast Retrasmission<\/span><\/strong>\n<\/p>\n<p>\n\t<span style=\"font-size:14px;\">&nbsp;&nbsp;&nbsp;&nbsp;\u4e00\u822c\u6765\u8bf4\u662f\u7f51\u7edc\u62e5\u585e\u5bfc\u81f4\u4e22\u5305\uff0c\u6bd4\u5982\u53d1\u9001\u65b9\u7684\u62a5\u6587\u5230\u8fbe\u4e0d\u4e86\u63a5\u6536\u65b9\uff0c\u63a5\u53d7\u65b9\u6536\u4e0d\u5230\u9884\u671f\u5e8f\u5217\u53f7\u7684\u62a5\u6587\u5c31\u4f1a\u53d1\u9001dup ack\u7ed9\u53d1\u9001\u65b9\uff0c\u53d1\u9001\u65b9\u6536\u52303\u4e2adup ack\u5c31\u4f1a\u5feb\u901f\u91cd\u4f20\u800c\u4e0d\u5fc5\u7b49\u8d85\u65f6\u5b9a\u65f6\u5668\u3002<\/span>\n<\/p>\n<p>\n\t<span style=\"font-size:14px;\">&nbsp;&nbsp;&nbsp;&nbsp;https:\/\/ask.wireshark.org\/questions\/29&#8230;<\/span><\/p>\n","protected":false},"author":1,"featured_media":582,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[333],"tags":[],"class_list":["post-189","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v16.9 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>wireshark\u6293\u53d6\u5230TCP\u5305\u540e\u4e00\u4e9bInfo\u4fe1\u606f\u8bf4\u660e - Wayne&#039;s Blog<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"http:\/\/weizn.net\/?p=189\" \/>\n<meta property=\"og:locale\" content=\"zh_CN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"wireshark\u6293\u53d6\u5230TCP\u5305\u540e\u4e00\u4e9bInfo\u4fe1\u606f\u8bf4\u660e - Wayne&#039;s Blog\" \/>\n<meta property=\"og:description\" content=\"\u4e00\u3001TCP Fast Retrasmission    &nbsp;&nbsp;&nbsp;&nbsp;\u4e00\u822c\u6765\u8bf4\u662f\u7f51\u7edc\u62e5\u585e\u5bfc\u81f4\u4e22\u5305\uff0c\u6bd4\u5982\u53d1\u9001\u65b9\u7684\u62a5\u6587\u5230\u8fbe\u4e0d\u4e86\u63a5\u6536\u65b9\uff0c\u63a5\u53d7\u65b9\u6536\u4e0d\u5230\u9884\u671f\u5e8f\u5217\u53f7\u7684\u62a5\u6587\u5c31\u4f1a\u53d1\u9001dup ack\u7ed9\u53d1\u9001\u65b9\uff0c\u53d1\u9001\u65b9\u6536\u52303\u4e2adup ack\u5c31\u4f1a\u5feb\u901f\u91cd\u4f20\u800c\u4e0d\u5fc5\u7b49\u8d85\u65f6\u5b9a\u65f6\u5668\u3002    &nbsp;&nbsp;&nbsp;&nbsp;https:\/\/ask.wireshark.org\/questions\/29...\" \/>\n<meta property=\"og:url\" content=\"http:\/\/weizn.net\/?p=189\" \/>\n<meta property=\"og:site_name\" content=\"Wayne&#039;s Blog\" \/>\n<meta property=\"article:published_time\" content=\"2016-07-04T15:21:33+00:00\" \/>\n<meta property=\"og:image\" content=\"http:\/\/www.weizn.net\/content\/uploadfile\/201607\/25ffd4cb28e4132a3c953154c812dbac20160704143858.png\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" 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