{"id":2405,"date":"2024-03-19T02:07:03","date_gmt":"2024-03-18T18:07:03","guid":{"rendered":"http:\/\/www.ccwifi.cc\/blogs\/?p=2405"},"modified":"2024-03-19T02:07:03","modified_gmt":"2024-03-18T18:07:03","slug":"%e6%8f%a1%e6%89%8b%e5%8c%85%e4%bb%80%e4%b9%88%e6%84%8f%e6%80%9dtcp%e8%bf%9e%e6%8e%a5%e5%bb%ba%e7%ab%8b%e7%9a%84%e4%b8%89%e6%ac%a1%e6%8f%a17746","status":"publish","type":"post","link":"https:\/\/www.ccwifi.cc\/blogs\/2024\/03\/19\/%e6%8f%a1%e6%89%8b%e5%8c%85%e4%bb%80%e4%b9%88%e6%84%8f%e6%80%9dtcp%e8%bf%9e%e6%8e%a5%e5%bb%ba%e7%ab%8b%e7%9a%84%e4%b8%89%e6%ac%a1%e6%8f%a17746\/","title":{"rendered":"\u63e1\u624b\u5305\u4ec0\u4e48\u610f\u601d TCP \u8fde\u63a5\u5efa\u7acb\u7684\u4e09\u6b21\u63e1\u624b\u8fc7\u7a0b\u53ef\u4ee5\u643a\u5e26\u6570\u636e\u5417\uff1f"},"content":{"rendered":"<div>\n<p>\u5728\u7ebfwifi\u8dd1\u5305 \u91d1\u521a\u5305\u8dd1\u5305 cap\u8dd1\u5305 hccapx ewsa\u5728\u7ebf \u5c31\u6765 <strong><a href=\"https:\/\/ccwifi.cc\" target=\"_blank\" rel=\"noopener\">\u63e1\u624b\u5305\u8dd1\u5305<\/a><\/strong><\/p>\n<p>\u5404\u4f4d\u597d \u53c8\u89c1\u9762\u4e86 \u6211\u662f\u66f9\u64cd \u4eca\u5929\u7ed9\u5927\u5bb6\u5e26\u6765\u4e00\u7bc7\u65b0\u7684\u6559\u7a0b<\/p>\n<p>\u5e0c\u671b\u5404\u4f4d\u7ec6\u5fc3\u5b66\u4e60 \u4f4e\u8c03\u7528\u7f51<\/p>\n<\/div>\n<p><img decoding=\"async\" src=\"http:\/\/www.ccwifi.cc\/blogs\/wp-content\/uploads\/2024\/03\/1710785221242_0.jpg\" alt=\"\u63e1\u624b\u5305\u4ec0\u4e48\u610f\u601d\"><\/p>\n<p>TCP\u8fde\u63a5\u5efa\u7acb\u7684\u4e09\u6b21\u63e1\u624b\u8fc7\u7a0b\u662f\u5426\u53ef\u4ee5\u4f20\u8f93\u6570\u636e\uff1f\u6700\u8fd1\u5728\u5b9e\u9a8c\u5ba4\u7684\u7fa4\u91cc\u6709\u4eba\u63d0\u51fa\u4e86\u8fd9\u4e2a\u95ee\u9898\u3002\u6211\u7a81\u7136\u53d1\u73b0\u81ea\u5df1\u5bf9\u8fd9\u4e2a\u95ee\u9898\u5e76\u4e0d\u6e05\u695a\u3002\u5e73\u65f6\u5728\u4f7f\u7528tcpdump\u6216Wireshark\u8fdb\u884c\u6293\u5305\u65f6\uff0c\u4ece\u6765\u6ca1\u6709\u6ce8\u610f\u8fc7\u7b2c\u4e09\u6b21\u63e1\u624b\u7684ACK\u5305\u662f\u5426\u643a\u5e26\u6570\u636e\u3002\u4e8e\u662f\u6211\u8d76\u7d27\u4f7f\u7528nc\u7ed3\u5408tcpdump\u8fdb\u884c\u4e86\u51e0\u6b21\u6293\u5305\u5b9e\u9a8c\u6765\u9a8c\u8bc1\u4e00\u4e0b\u3002\u4f46\u662f\u7ecf\u8fc7\u591a\u6b21\u5b9e\u9a8c\uff0c\u6211\u786e\u5b9e\u53d1\u73b0\u7b2c\u4e09\u6b21\u63e1\u624b\u7684\u5305\u6ca1\u6709\u5176\u4ed6\u6570\u636e\uff08\u540e\u6587\u4f1a\u89e3\u91ca\uff09\u3002\u5728\u540e\u7eed\u7684\u63a2\u7a76\u4e2d\uff0c\u6211\u53d1\u73b0\u4e86\u4e00\u4e9b\u95ee\u9898\uff0c\u4e8e\u662f\u6574\u7406\u4e86\u63a2\u7a76\u8fc7\u7a0b\u548c\u7ed3\u8bba\uff0c\u4f9b\u540e\u6765\u8005\u53c2\u8003\u3002<\/p>\n<p>\u9996\u5148\uff0c\u8ba9\u6211\u4eec\u770b\u4e00\u4e0b\u4e09\u6b21\u63e1\u624b\u7684\u56fe\u793a\uff08\u4e0b\u9762\u8fd9\u5f20\u56fe\u6765\u81ea\u7f51\u7edc\uff0c\u82e5\u4fb5\u72af\u4e86\u4f5c\u8005\u6743\u5229\uff0c\u8bf7\u8054\u7cfb\u6211\u5220\u9664\uff09\uff1a<\/p>\n<p><img decoding=\"async\" src=\"http:\/\/www.ccwifi.cc\/blogs\/wp-content\/uploads\/2024\/03\/1710785221242_1.jpg\" alt=\"\u63e1\u624b\u5305\u4ec0\u4e48\u610f\u601d\"><\/p>\n<p>\u6839\u636eRFC793\u6587\u6863\uff0c\u5e26\u6709SYN\u6807\u5fd7\u7684\u63e1\u624b\u5305\u662f\u4e0d\u5141\u8bb8\u643a\u5e26\u6570\u636e\u7684\uff0c\u4e5f\u5c31\u662f\u8bf4\u524d\u4e24\u6b21\u63e1\u624b\u662f\u4e0d\u5141\u8bb8\u643a\u5e26\u6570\u636e\u7684\uff08\u4ece\u903b\u8f91\u4e0a\u6765\u770b\uff0c\u8fde\u63a5\u8fd8\u6ca1\u6709\u5efa\u7acb\uff0c\u643a\u5e26\u6570\u636e\u4f3c\u4e4e\u4e5f\u8bf4\u4e0d\u8fc7\u53bb\uff09\u3002\u91cd\u70b9\u662f\u7b2c\u4e09\u6b21\u63e1\u624b\u662f\u5426\u5141\u8bb8\u643a\u5e26\u6570\u636e\u3002<\/p>\n<p>\u5148\u8bf4\u7ed3\u8bba\uff1aTCP\u534f\u8bae\u5efa\u7acb\u8fde\u63a5\u7684\u4e09\u6b21\u63e1\u624b\u8fc7\u7a0b\u4e2d\u7684\u7b2c\u4e09\u6b21\u63e1\u624b\u5141\u8bb8\u643a\u5e26\u6570\u636e\u3002<\/p>\n<p>\u5bf9\u7167\u4e0a\u9762\u7684TCP\u72b6\u6001\u53d8\u5316\u56fe\u4e2d\u7684\u8fde\u63a5\u5efa\u7acb\u90e8\u5206\uff0c\u6211\u4eec\u6765\u770b\u4e00\u4e0bRFC793\u6587\u6863\u7684\u8bf4\u6cd5\u3002RFC793\u6587\u6863\u4e2d\u7684\u63cf\u8ff0\u5982\u4e0b\uff08\u7701\u7565\u4e0d\u91cd\u8981\u7684\u90e8\u5206\uff09\uff1a<\/p>\n<p>\u91cd\u70b9\u662f\u8fd9\u53e5\u8bdd\u201cData or controls which were queued for transmission may be included\u201d\uff0c\u4e5f\u5c31\u662f\u8bf4\u6807\u51c6\u8868\u793a\u7b2c\u4e09\u6b21\u63e1\u624b\u7684ACK\u5305\u662f\u53ef\u4ee5\u643a\u5e26\u6570\u636e\u7684\u3002\u90a3\u4e48Linux\u5185\u6838\u7684\u534f\u8bae\u6808\u662f\u5982\u4f55\u5904\u7406\u7684\u5462\uff1f\u4faf\u6377\u5148\u751f\u66fe\u7ecf\u8bf4\u8fc7\uff0c\u201c\u6e90\u7801\u9762\u524d\uff0c\u4e86\u65e0\u79d8\u5bc6\u201d\u3002\u6700\u8fd1Kernel 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decoding=\"async\" src=\"http:\/\/www.ccwifi.cc\/blogs\/wp-content\/uploads\/2024\/03\/1710785221242_4.png\" alt=\"\u63e1\u624b\u5305\u4ec0\u4e48\u610f\u601d\"><\/p>\n<p>\u8fd9\u4e2a\u51fd\u6570\u5b9e\u9645\u4e0a\u662f\u4e00\u4e2aTCP\u72b6\u6001\u673a\uff0c\u7528\u4e8e\u5904\u7406TCP\u8fde\u63a5\u5904\u4e8e\u5404\u4e2a\u72b6\u6001\u65f6\u6536\u5230\u6570\u636e\u5305\u7684\u5904\u7406\u5de5\u4f5c\u3002\u8fd9\u91cc\u6709\u51e0\u4e2a\u5e76\u5217\u7684switch\u8bed\u53e5\uff0c\u56e0\u4e3a\u51fd\u6570\u5f88\u957f\uff0c\u6240\u4ee5\u5bb9\u6613\u770b\u9519\u5c42\u6b21\u5173\u7cfb\u3002\u4e0b\u56fe\u662f\u7cbe\u7b80\u4e86\u65e0\u9700\u5173\u6ce8\u7684\u4ee3\u7801\u4e4b\u540eSYN-RECV\u72b6\u6001\u7684\u5904\u7406\u8fc7\u7a0b\uff1a<\/p>\n<p><img decoding=\"async\" src=\"http:\/\/www.ccwifi.cc\/blogs\/wp-content\/uploads\/2024\/03\/1710785221242_6.png\" alt=\"\u63e1\u624b\u5305\u4ec0\u4e48\u610f\u601d\"><\/p>\n<p>\u8bf7\u6ce8\u610f\u8fd9\u4e24\u4e2aswitch\u8bed\u53e5\u662f\u5e76\u5217\u7684\u3002\u6240\u4ee5\u5f53TCP<em>SYN<\/em>RECV\u72b6\u6001\u6536\u5230\u5408\u6cd5\u89c4\u8303\u7684\u7b2c\u4e8c\u6b21\u63e1\u624b\u5305\u4e4b\u540e\uff0c\u5c31\u4f1a\u7acb\u5373\u5c06socket\u72b6\u6001\u8bbe\u7f6e\u4e3aTCP_ESTABLISHED\u72b6\u6001\uff0c\u5e76\u7ee7\u7eed\u5904\u7406\u5176\u4e2d\u5305\u542b\u7684\u6570\u636e\uff08\u5982\u679c\u6709\u7684\u8bdd\uff09\u3002<\/p>\n<p>\u4e0a\u9762\u7684\u4ee3\u7801\u8868\u660e\uff0c\u5f53\u5ba2\u6237\u7aef\u53d1\u9001\u7684\u7b2c\u4e09\u6b21\u63e1\u624b\u7684ACK\u5305\u542b\u6709\u6570\u636e\u65f6\uff0c\u670d\u52a1\u7aef\u662f\u53ef\u4ee5\u6b63\u5e38\u5904\u7406\u7684\u3002\u90a3\u4e48\u5ba2\u6237\u7aef\u5462\uff1f\u6211\u4eec\u6765\u770b\u770b\u5ba2\u6237\u7aef\u5728SYN-SEND\u72b6\u6001\u4e0b\u53d1\u9001\u7b2c\u4e09\u6b21ACK\u5305\u7684\u8fc7\u7a0b\u3002\u5982\u4e0b\u56fe\u6240\u793a\uff1a<\/p>\n<p>tcp<em>rcv<\/em>synsent<em>state<\/em>process\u51fd\u6570\u7684\u5b9e\u73b0\u6bd4\u8f83\u957f\uff0c\u8fd9\u91cc\u76f4\u63a5\u8d34\u51fa\u6700\u540e\u7684\u5173\u952e\u90e8\u5206\uff1a<\/p>\n<p><img decoding=\"async\" src=\"http:\/\/www.ccwifi.cc\/blogs\/wp-content\/uploads\/2024\/03\/1710785221242_7.png\" alt=\"\u63e1\u624b\u5305\u4ec0\u4e48\u610f\u601d\"><\/p>\n<p>\u4e00\u76ee\u4e86\u7136\u5427\uff1f\u5982\u679c\u6761\u4ef6\u4e0d\u6ee1\u8db3\uff0c\u76f4\u63a5\u56de\u590d\u72ec\u7acb\u7684ACK\u5305\uff1b\u5982\u679c\u4efb\u610f\u6761\u4ef6\u6ee1\u8db3\uff0c\u5219\u4f7f\u7528inet<em>csk<\/em>reset<em>xmit<\/em>timer\u51fd\u6570\u8bbe\u7f6e\u5b9a\u65f6\u5668\uff0c\u7b49\u5f85\u4e00\u5c0f\u6bb5\u65f6\u95f4\u3002\u5728\u8fd9\u6bb5\u65f6\u95f4\u5185\uff0c\u5982\u679c\u6709\u6570\u636e\uff0c\u5219\u968f\u6570\u636e\u4e00\u8d77\u53d1\u9001ACK\u5305\uff1b\u5982\u679c\u6ca1\u6709\u6570\u636e\uff0c\u5219\u53ea\u56de\u590dACK\u5305\u3002<\/p>\n<p>\u4e4b\u524d\u7684\u7591\u95ee\u5f97\u5230\u4e86\u89e3\u7b54\u3002<\/p>\n<p>\u4f46\u662f\uff0c\u8fd9\u4e09\u4e2a\u6761\u4ef6\u662f\u4ec0\u4e48\uff1f\u4ec0\u4e48\u60c5\u51b5\u4e0b\u4f1a\u5bfc\u81f4\u7b2c\u4e09\u6b21\u63e1\u624b\u5305\u53ef\u80fd\u643a\u5e26\u6570\u636e\u5462\uff1f\u6216\u8005\u8bf4\uff0c\u60f3\u8981\u6293\u5230\u4e00\u4e2a\u7b2c\u4e09\u6b21\u63e1\u624b\u5305\u643a\u5e26\u6570\u636e\u7684\u5305\uff0c\u9700\u8981\u600e\u4e48\u505a\uff1f\u522b\u6025\uff0c\u672c\u6587\u559c\u6b22\u6df1\u5165\u63a2\u7a76\uff0c\u4e0b\u9762\u4e00\u4e00\u89e3\u91ca\u3002<\/p>\n<p>\u6761\u4ef61\uff1ask-&gt;sk<em>write<\/em>pending != 0<\/p>\n<p>\u8fd9\u4e2a\u503c\u9ed8\u8ba4\u4e3a0\uff0c\u90a3\u4e48\u4ec0\u4e48\u60c5\u51b5\u4e0b\u4f1a\u5bfc\u81f4\u5b83\u4e0d\u4e3a0\u5462\uff1f\u7b54\u6848\u662f\u5f53\u534f\u8bae\u6808\u53d1\u9001\u6570\u636e\u7684\u51fd\u6570\u9047\u5230socket\u72b6\u6001\u4e0d\u662fESTABLISHED\u65f6\uff0c\u4f1a\u5bf9\u8fd9\u4e2a\u53d8\u91cf\u8fdb\u884c++\u64cd\u4f5c\uff0c\u5e76\u7b49\u5f85\u4e00\u5c0f\u6bb5\u65f6\u95f4\u5c1d\u8bd5\u53d1\u9001\u6570\u636e\u3002\u5982\u4e0b\u56fe\u6240\u793a\uff1a<\/p>\n<p><img decoding=\"async\" src=\"http:\/\/www.ccwifi.cc\/blogs\/wp-content\/uploads\/2024\/03\/1710785221242_8.png\" alt=\"\u63e1\u624b\u5305\u4ec0\u4e48\u610f\u601d\"><!-- \u6587\u7ae0\u6765\u6e90:http:\/\/mp.weixin.qq.com\/s?src=3&amp;timestamp=1710784652&amp;ver=1&amp;signature=xlZQWoYDkMnaWMwK-u92oYO1d87hs6ireNQL7rWXHybYqysaJsovEU5YTQaiv-leF-ZxwIVap*TTdrfAzrwJ1z5hg*WDiEuhrzpG3sgXQPim1j4C66kHcBH*mYo5RPTmVaKXoNjr5NU7pRQj3Fikw== --><\/p>\n<p>net\/core\/stream.c\u6587\u4ef6\u4e2d\u7684sk<em>stream<\/em>wait<em>connect\u51fd\u6570\u6267\u884c\u4e86\u4ee5\u4e0b\u64cd\u4f5c\uff1a\u9012\u589esk-&gt;sk<\/em>write_pending\uff0c\u5e76\u7b49\u5f85socket\u8fde\u63a5\u8fbe\u5230ESTABLISHED\u72b6\u6001\u540e\u53d1\u9001\u6570\u636e\u3002\u8fd9\u5c31\u89e3\u91ca\u6e05\u695a\u4e86\u3002<\/p>\n<p>Linux socket\u7684\u9ed8\u8ba4\u5de5\u4f5c\u65b9\u5f0f\u662f\u963b\u585e\u7684\uff0c\u4e5f\u5c31\u662f\u8bf4\uff0c\u9ed8\u8ba4\u60c5\u51b5\u4e0b\uff0c\u5ba2\u6237\u7aef\u7684connect\u8c03\u7528\u4f1a\u963b\u585e\uff0c\u76f4\u5230\u4e09\u6b21\u63e1\u624b\u8fc7\u7a0b\u7ed3\u675f\u6216\u9047\u5230\u9519\u8bef\u624d\u4f1a\u8fd4\u56de\u3002\u56e0\u6b64\uff0c\u50cfnc\u8fd9\u79cd\u5b8c\u5168\u4f7f\u7528\u963b\u585e\u5957\u63a5\u5b57\u5b9e\u73b0\u7684\u547d\u4ee4\u884c\u5c0f\u7a0b\u5e8f\uff0c\u4e14\u6ca1\u6709\u4fee\u6539\u9ed8\u8ba4\u7684socket\u53c2\u6570\uff0c\u4f1a\u4e56\u4e56\u5730\u7b49\u5f85connect\u8fd4\u56de\u6210\u529f\u6216\u5931\u8d25\u540e\u624d\u53d1\u9001\u6570\u636e\uff0c\u8fd9\u5c31\u662f\u6211\u4eec\u65e0\u6cd5\u6293\u5230\u7b2c\u4e09\u6b21\u63e1\u624b\u5305\u643a\u5e26\u6570\u636e\u7684\u539f\u56e0\u3002<\/p>\n<p>\u5982\u679c\u5c06\u5957\u63a5\u5b57\u8bbe\u7f6e\u4e3a\u975e\u963b\u585e\uff0c\u7136\u540e\u5728connect\u4e4b\u540e\u7acb\u5373\u53d1\u9001\u6570\u636e\uff0c\u5982\u679c\u8fde\u63a5\u8fc7\u7a0b\u4e0d\u662f\u7acb\u5373\u6210\u529f\u7684\u8bdd\uff0c\u4e5f\u8bb8\u5c31\u6709\u673a\u4f1a\u770b\u5230\u7b2c\u4e09\u6b21\u63e1\u624b\u5305\u643a\u5e26\u6570\u636e\u3002\u4f46\u662f\u5373\u4f7f\u662f\u975e\u963b\u585e\u5957\u63a5\u5b57\uff0c\u5f00\u6e90\u7684\u7f51\u7edc\u5e93\u4e5f\u4f1a\u76d1\u542c\u8be5\u5957\u63a5\u5b57\u7684\u53ef\u5199\u4e8b\u4ef6\uff0c\u53ea\u6709\u786e\u8ba4\u8fde\u63a5\u6210\u529f\u540e\u624d\u4f1a\u5199\u5165\u6570\u636e\u3002\u4e3a\u4e86\u8282\u7701\u51e0\u4e4e\u53ef\u4ee5\u5ffd\u7565\u4e0d\u8ba1\u7684\u6027\u80fd\uff0c\u5b89\u5168\u53ef\u9760\u7684\u4ee3\u7801\u66f4\u6709\u4ef7\u503c\u3002<\/p>\n<p>\u6761\u4ef62\uff1aicsk-&gt;icsk<em>accept<\/em>queue.rskq<em>defer<\/em>accept != 0<\/p>\n<p>\u8fd9\u4e2a\u6761\u4ef6\u5f88\u5947\u602a\uff0cdefer<em>accept\u662f\u4e00\u4e2a\u5957\u63a5\u5b57\u9009\u9879\uff0c\u7528\u4e8e\u63a8\u8fdfaccept\uff0c\u5b9e\u9645\u4e0a\u662f\u5728\u63a5\u6536\u5230\u7b2c\u4e00\u4e2a\u6570\u636e\u540e\u624d\u521b\u5efa\u8fde\u63a5\u3002tcp<\/em>defer<em>accept\u8fd9\u4e2a\u9009\u9879\u901a\u5e38\u5728\u670d\u52a1\u7aef\u4f7f\u7528\uff0c\u5b83\u4f1a\u5f71\u54cd\u5957\u63a5\u5b57\u7684SYN\u548cACCEPT\u961f\u5217\u3002\u9ed8\u8ba4\u60c5\u51b5\u4e0b\uff0c\u4e09\u6b21\u63e1\u624b\u5b8c\u6210\u540e\uff0c\u5957\u63a5\u5b57\u4f1a\u8fdb\u5165ACCEPT\u961f\u5217\uff0c\u5e94\u7528\u5c42\u4f1a\u611f\u77e5\u5e76ACCEPT\u76f8\u5173\u7684\u8fde\u63a5\u3002\u5f53\u8bbe\u7f6e\u4e86tcp<\/em>defer_accept\u540e\uff0c\u4e09\u6b21\u63e1\u624b\u5b8c\u6210\u540e\uff0c\u5957\u63a5\u5b57\u4e0d\u4f1a\u8fdb\u5165ACCEPT\u961f\u5217\uff0c\u800c\u662f\u7559\u5728SYN\u961f\u5217\uff08\u6709\u957f\u5ea6\u9650\u5236\uff0c\u8d85\u8fc7\u5185\u6838\u4f1a\u62d2\u7edd\u65b0\u8fde\u63a5\uff09\uff0c\u76f4\u5230\u771f\u6b63\u6536\u5230\u6570\u636e\u540e\u624d\u653e\u5165ACCEPT\u961f\u5217\u3002\u8bbe\u7f6e\u4e86\u8fd9\u4e2a\u9009\u9879\u7684\u670d\u52a1\u7aef\u53ef\u4ee5\u76f4\u63a5\u8fdb\u884caccept\u540e\u7684\u8bfb\u53d6\u64cd\u4f5c\uff0c\u80af\u5b9a\u4f1a\u6709\u6570\u636e\uff0c\u4e5f\u53ef\u4ee5\u8282\u7701\u4e00\u6b21\u7cfb\u7edf\u8c03\u7528\u3002<\/p>\n<p>\u6709\u8da3\u7684\u662f\uff0c\u5982\u679c\u5ba2\u6237\u7aef\u5148\u7ed1\u5b9a\u5230\u4e00\u4e2a\u7aef\u53e3\u548cIP\uff0c\u7136\u540e\u8bbe\u7f6esocket\u9009\u9879TCP<em>DEFER<\/em>ACCEPT\uff0c\u7136\u540e\u8fde\u63a5\u670d\u52a1\u5668\uff0c\u8fd9\u65f6\u5019\u5c31\u4f1a\u51fa\u73b0rskq<em>defer<\/em>accept=1\u7684\u60c5\u51b5\u3002\u8fd9\u65f6\u5019\u5185\u6838\u4f1a\u8bbe\u7f6e\u5b9a\u65f6\u5668\uff0c\u7b49\u5f85\u6570\u636e\u4e00\u8d77\u56de\u590dACK\u5305\u3002\u6211\u4e2a\u4eba\u4ece\u672a\u8fd9\u6837\u505a\u8fc7\uff0c\u96be\u9053\u53ea\u662f\u4e3a\u4e86\u51cf\u5c11\u4e00\u6b21\u7a7a\u7684ACK\u5305\u53d1\u9001\u6765\u63d0\u9ad8\u6027\u80fd\uff1f\u5982\u679c\u6709\u540c\u5b66\u77e5\u9053\uff0c\u8bf7\u544a\u77e5\uff0c\u8c22\u8c22\u3002<\/p>\n<p>\u6761\u4ef63\uff1aicsk-&gt;icsk_ack.pingpong != 0<\/p>\n<p>pingpong\u662f\u4e00\u4e2a\u5957\u63a5\u5b57\u9009\u9879\uff0c\u7528\u4e8e\u8868\u793a\u5f53\u524d\u8fde\u63a5\u662f\u5426\u4e3a\u4ea4\u4e92\u5f0f\u6570\u636e\u6d41\uff0c\u5982\u679c\u503c\u4e3a1\uff0c\u5219\u8868\u793a\u4e3a\u4ea4\u4e92\u5f0f\u6570\u636e\u6d41\uff0c\u4f1a\u4f7f\u7528\u5ef6\u8fdf\u786e\u8ba4\u673a\u5236\u3002<\/p>\n<p>\u597d\u4e86\uff0c\u672c\u6587\u5230\u6b64\u5c31\u5e94\u8be5\u7ed3\u675f\u4e86\u3002\u4e0a\u9762\u7684\u51fd\u6570\u51fa\u73b0\u6bd4\u8f83\u6742\u4e71\uff0c\u5177\u4f53\u7684\u8c03\u7528\u94fe\u53ef\u4ee5\u53c2\u8003\u8fd9\u7bc7\u6587\u7ae0\u300aTCP\u5185\u6838\u6e90\u7801\u5206\u6790\u7b14\u8bb0\u300b\uff0c\u4f46\u7531\u4e8e\u5185\u6838\u7248\u672c\u7684\u4e0d\u540c\uff0c\u53ef\u80fd\u4f1a\u6709\u4e9b\u8bb8\u5dee\u5f02\u3002\u6bd5\u7adf\u6211\u5bf9\u534f\u8bae\u6808\u7684\u7814\u7a76\u6709\u9650\uff0c\u5c31\u4e0d\u518d\u591a\u8bf4\u4e86\u3002<\/p>\n<p>sohu-dba<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u63e1\u624b\u5305\u4ec0\u4e48\u610f\u601d TCP \u8fde\u63a5\u5efa\u7acb\u7684\u4e09\u6b21\u63e1\u624b\u8fc7\u7a0b\u53ef\u4ee5\u643a\u5e26\u6570\u636e\u5417\uff1fTCP \u8fde\u63a5\u5efa\u7acb\u7684\u4e09\u6b21\u63e1\u624b\u8fc7\u7a0b\u53ef\u4ee5\u643a\u5e26\u6570\u636e\u5417\uff1f\u524d\u51e0\u5929\u5b9e\u9a8c\u5ba4\u7684\u7fa4\u91cc\u6254\u51fa\u4e86\u8fd9\u6837\u4e00\u4e2a\u95ee\u9898\uff1aTCP 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