“`” \u53c2\u8003\u56de\u7b54\uff1a<\/p>\n
TCP\u4fdd\u8bc1\u53ef\u9760\u6027\uff1a<\/p>\n
\uff081\uff09\u5e8f\u5217\u53f7\u3001\u786e\u8ba4\u5e94\u7b54\u3001\u8d85\u65f6\u91cd\u4f20<\/p>\n
\u6570\u636e\u5230\u8fbe\u63a5\u6536\u65b9\uff0c\u63a5\u6536\u65b9\u9700\u8981\u53d1\u51fa\u4e00\u4e2a\u786e\u8ba4\u5e94\u7b54\uff0c\u8868\u793a\u5df2\u7ecf\u6536\u5230\u8be5\u6570\u636e\u6bb5\uff0c\u5e76\u4e14\u786e\u8ba4\u5e8f\u53f7\u4f1a\u8bf4\u660e\u4e86\u5b83\u4e0b\u4e00\u6b21\u9700\u8981\u63a5\u6536\u7684\u6570\u636e\u5e8f\u5217\u53f7\u3002\u5982\u679c\u53d1\u9001\u53d1\u8fdf\u8fdf\u672a\u6536\u5230\u786e\u8ba4\u5e94\u7b54\uff0c\u90a3\u4e48\u53ef\u80fd\u662f\u53d1\u9001\u7684\u6570\u636e\u4e22\u5931\uff0c\u4e5f\u53ef\u80fd\u662f\u786e\u8ba4\u5e94\u7b54\u4e22\u5931\uff0c\u8fd9\u65f6\u53d1\u9001\u65b9\u5728\u7b49\u5f85\u4e00\u5b9a\u65f6\u95f4\u540e\u4f1a\u8fdb\u884c\u91cd\u4f20\u3002\u8fd9\u4e2a\u65f6\u95f4\u4e00\u822c\u662f2*RTT(\u62a5\u6587\u6bb5\u5f80\u8fd4\u65f6\u95f4\uff09+\u4e00\u4e2a\u504f\u5dee\u503c\u3002<\/p>\n
\uff082\uff09\u7a97\u53e3\u63a7\u5236\u4e0e\u9ad8\u901f\u91cd\u53d1\u63a7\u5236\/\u5feb\u901f\u91cd\u4f20\uff08\u91cd\u590d\u786e\u8ba4\u5e94\u7b54\uff09<\/p>\n
TCP\u4f1a\u5229\u7528\u7a97\u53e3\u63a7\u5236\u6765\u63d0\u9ad8\u4f20\u8f93\u901f\u5ea6\uff0c\u610f\u601d\u662f\u5728\u4e00\u4e2a\u7a97\u53e3\u5927\u5c0f\u5185\uff0c\u4e0d\u7528\u4e00\u5b9a\u8981\u7b49\u5230\u5e94\u7b54\u624d\u80fd\u53d1\u9001\u4e0b\u4e00\u6bb5\u6570\u636e\uff0c\u7a97\u53e3\u5927\u5c0f\u5c31\u662f\u65e0\u9700\u7b49\u5f85\u786e\u8ba4\u800c\u53ef\u4ee5\u7ee7\u7eed\u53d1\u9001\u6570\u636e\u7684\u6700\u5927\u503c\u3002\u5982\u679c\u4e0d\u4f7f\u7528\u7a97\u53e3\u63a7\u5236\uff0c\u6bcf\u4e00\u4e2a\u6ca1\u6536\u5230\u786e\u8ba4\u5e94\u7b54\u7684\u6570\u636e\u90fd\u8981\u91cd\u53d1\u3002<\/p>\n
\u4f7f\u7528\u7a97\u53e3\u63a7\u5236\uff0c\u5982\u679c\u6570\u636e\u6bb51001-2000\u4e22\u5931\uff0c\u540e\u9762\u6570\u636e\u6bcf\u6b21\u4f20\u8f93\uff0c\u786e\u8ba4\u5e94\u7b54\u90fd\u4f1a\u4e0d\u505c\u5730\u53d1\u9001\u5e8f\u53f7\u4e3a1001\u7684\u5e94\u7b54\uff0c\u8868\u793a\u6211\u8981\u63a5\u65361001\u5f00\u59cb\u7684\u6570\u636e\uff0c\u53d1\u9001\u7aef\u5982\u679c\u6536\u52303\u6b21\u76f8\u540c\u5e94\u7b54\uff0c\u5c31\u4f1a\u7acb\u523b\u8fdb\u884c\u91cd\u53d1\uff1b\u4f46\u8fd8\u6709\u79cd\u60c5\u51b5\u6709\u53ef\u80fd\u662f\u6570\u636e\u90fd\u6536\u5230\u4e86\uff0c\u4f46\u662f\u6709\u7684\u5e94\u7b54\u4e22\u5931\u4e86\uff0c\u8fd9\u79cd\u60c5\u51b5\u4e0d\u4f1a\u8fdb\u884c\u91cd\u53d1\uff0c\u56e0\u4e3a\u53d1\u9001\u7aef\u77e5\u9053\uff0c\u5982\u679c\u662f\u6570\u636e\u6bb5\u4e22\u5931\uff0c\u63a5\u6536\u7aef\u4e0d\u4f1a\u653e\u8fc7\u5b83\u7684\uff0c\u4f1a\u75af\u72c2\u5411\u5b83\u63d0\u9192……<\/p>\n
\uff083\uff09\u62e5\u585e\u63a7\u5236<\/p>\n
\u5982\u679c\u628a\u7a97\u53e3\u5b9a\u7684\u5f88\u5927\uff0c\u53d1\u9001\u7aef\u8fde\u7eed\u53d1\u9001\u5927\u91cf\u7684\u6570\u636e\uff0c\u53ef\u80fd\u4f1a\u9020\u6210\u7f51\u7edc\u7684\u62e5\u5835\uff08\u5927\u5bb6\u90fd\u5728\u7528\u7f51\uff0c\u4f60\u5728\u8fd9\u72c2\u53d1\uff0c\u541e\u5410\u91cf\u5c31\u90a3\u4e48\u5927\uff0c\u5f53\u7136\u4f1a\u5835\uff09\uff0c\u751a\u81f3\u9020\u6210\u7f51\u7edc\u7684\u762b\u75ea\u3002\u6240\u4ee5TCP\u5728\u4e3a\u4e86\u9632\u6b62\u8fd9\u79cd\u60c5\u51b5\u800c\u8fdb\u884c\u4e86\u62e5\u585e\u63a7\u5236\u3002<\/p>\n
\u6162\u542f\u52a8\uff1a\u5b9a\u4e49\u62e5\u585e\u7a97\u53e3\uff0c\u4e00\u5f00\u59cb\u5c06\u8be5\u7a97\u53e3\u5927\u5c0f\u8bbe\u4e3a1\uff0c\u4e4b\u540e\u6bcf\u6b21\u6536\u5230\u786e\u8ba4\u5e94\u7b54\uff08\u7ecf\u8fc7\u4e00\u4e2artt\uff09\uff0c\u5c06\u62e5\u585e\u7a97\u53e3\u5927\u5c0f*2\u3002<\/p>\n
\u62e5\u585e\u907f\u514d\uff1a\u8bbe\u7f6e\u6162\u542f\u52a8\u9608\u503c\uff0c\u4e00\u822c\u5f00\u59cb\u90fd\u8bbe\u4e3a65536\u3002\u62e5\u585e\u907f\u514d\u662f\u6307\u5f53\u62e5\u585e\u7a97\u53e3\u5927\u5c0f\u8fbe\u5230\u8fd9\u4e2a\u9608\u503c\uff0c\u62e5\u585e\u7a97\u53e3\u7684\u503c\u4e0d\u518d\u6307\u6570\u4e0a\u5347\uff0c\u800c\u662f\u52a0\u6cd5\u589e\u52a0\uff08\u6bcf\u6b21\u786e\u8ba4\u5e94\u7b54\/\u6bcf\u4e2artt\uff0c\u62e5\u585e\u7a97\u53e3\u5927\u5c0f+1\uff09\uff0c\u4ee5\u6b64\u6765\u907f\u514d\u62e5\u585e\u3002<\/p>\n
\u5c06\u62a5\u6587\u6bb5\u7684\u8d85\u65f6\u91cd\u4f20\u770b\u505a\u62e5\u585e\uff0c\u5219\u4e00\u65e6\u53d1\u751f\u8d85\u65f6\u91cd\u4f20\uff0c\u6211\u4eec\u9700\u8981\u5148\u5c06\u9608\u503c\u8bbe\u4e3a\u5f53\u524d\u7a97\u53e3\u5927\u5c0f\u7684\u4e00\u534a\uff0c\u5e76\u4e14\u5c06\u7a97\u53e3\u5927\u5c0f\u8bbe\u4e3a\u521d\u503c1\uff0c\u7136\u540e\u91cd\u65b0\u8fdb\u5165\u6162\u542f\u52a8\u8fc7\u7a0b\u3002<\/p>\n
\u5feb\u901f\u91cd\u4f20\uff1a\u5728\u9047\u52303\u6b21\u91cd\u590d\u786e\u8ba4\u5e94\u7b54\uff08\u9ad8\u901f\u91cd\u53d1\u63a7\u5236\uff09\u65f6\uff0c\u4ee3\u8868\u6536\u5230\u4e863\u4e2a\u62a5\u6587\u6bb5\uff0c\u4f46\u662f\u8fd9\u4e4b\u524d\u76841\u4e2a\u6bb5\u4e22\u5931\u4e86\uff0c\u4fbf\u5bf9\u5b83\u8fdb\u884c\u7acb\u5373\u91cd\u4f20\u3002<\/p>\n
\u7136\u540e\uff0c\u5148\u5c06\u9608\u503c\u8bbe\u4e3a\u5f53\u524d\u7a97\u53e3\u5927\u5c0f\u7684\u4e00\u534a\uff0c\u7136\u540e\u5c06\u62e5\u585e\u7a97\u53e3\u5927\u5c0f\u8bbe\u4e3a\u6162\u542f\u52a8\u9608\u503c+3\u7684\u5927\u5c0f\u3002<\/p>\n
\u8fd9\u6837\u53ef\u4ee5\u8fbe\u5230\uff1a\u5728TCP\u901a\u4fe1\u65f6\uff0c\u7f51\u7edc\u541e\u5410\u91cf\u5448\u73b0\u9010\u6e10\u7684\u4e0a\u5347\uff0c\u5e76\u4e14\u968f\u7740\u62e5\u5835\u6765\u964d\u4f4e\u541e\u5410\u91cf\uff0c\u518d\u8fdb\u5165\u6162\u6162\u4e0a\u5347\u7684\u8fc7\u7a0b\uff0c\u7f51\u7edc\u4e0d\u4f1a\u8f7b\u6613\u7684\u53d1\u751f\u762b\u75ea\u3002<\/p>\n
\u00a0<\/p>\n
TCP\u5efa\u7acb\u8fde\u63a5\u548c\u65ad\u5f00\u8fde\u63a5\u7684\u8fc7\u7a0b\uff1a<\/p>\n
<img alt=""img"" referrerpolicy=""no-referrer"" src=""https:\/\/uploadfiles.nowcoder.com\/images\/20190313\/311436_1552471554293_3A87D0457A6EE404083BBF3CB192C358""><\/p>\n
\u4e09\u6b21\u63e1\u624b\uff1a<\/p>\n
\\1. Client\u5c06\u6807\u5fd7\u4f4dSYN\u7f6e\u4e3a1\uff0c\u968f\u673a\u4ea7\u751f\u4e00\u4e2a\u503cseq=J\uff0c\u5e76\u5c06\u8be5\u6570\u636e\u5305\u53d1\u9001\u7ed9Server\uff0cClient\u8fdb\u5165SYN_SENT\u72b6\u6001\uff0c\u7b49\u5f85Server\u786e\u8ba4\u3002<\/p>\n
\\2. Server\u6536\u5230\u6570\u636e\u5305\u540e\u7531\u6807\u5fd7\u4f4dSYN=1\u77e5\u9053Client\u8bf7\u6c42\u5efa\u7acb\u8fde\u63a5\uff0cServer\u5c06\u6807\u5fd7\u4f4dSYN\u548cACK\u90fd\u7f6e\u4e3a1\uff0cack=J+1\uff0c\u968f\u673a\u4ea7\u751f\u4e00\u4e2a\u503cseq=K\uff0c\u5e76\u5c06\u8be5\u6570\u636e\u5305\u53d1\u9001\u7ed9Client\u4ee5\u786e\u8ba4\u8fde\u63a5\u8bf7\u6c42\uff0cServer\u8fdb\u5165SYN_RCVD\u72b6\u6001\u3002<\/p>\n
\\3. Client\u6536\u5230\u786e\u8ba4\u540e\uff0c\u68c0\u67e5ack\u662f\u5426\u4e3aJ+1\uff0cACK\u662f\u5426\u4e3a1\uff0c\u5982\u679c\u6b63\u786e\u5219\u5c06\u6807\u5fd7\u4f4dACK\u7f6e\u4e3a1\uff0cack=K+1\uff0c\u5e76\u5c06\u8be5\u6570\u636e\u5305\u53d1\u9001\u7ed9Server\uff0cServer\u68c0\u67e5ack\u662f\u5426\u4e3aK+1\uff0cACK\u662f\u5426\u4e3a1\uff0c\u5982\u679c\u6b63\u786e\u5219\u8fde\u63a5\u5efa\u7acb\u6210\u529f\uff0cClient\u548cServer\u8fdb\u5165ESTABLISHED\u72b6\u6001\uff0c\u5b8c\u6210\u4e09\u6b21\u63e1\u624b\uff0c\u968f\u540eClient\u4e0eServer\u4e4b\u95f4\u53ef\u4ee5\u5f00\u59cb\u4f20\u8f93\u6570\u636e\u4e86\u3002<\/p>\n
\u00a0<\/p>\n
\u56db\u6b21\u6325\u624b\uff1a<\/p>\n
\u7531\u4e8eTCP\u8fde\u63a5\u65f6\u5168\u53cc\u5de5\u7684\uff0c\u56e0\u6b64\uff0c\u6bcf\u4e2a\u65b9\u5411\u90fd\u5fc5\u987b\u8981\u5355\u72ec\u8fdb\u884c\u5173\u95ed\uff0c\u8fd9\u4e00\u539f\u5219\u662f\u5f53\u4e00\u65b9\u5b8c\u6210\u6570\u636e\u53d1\u9001\u4efb\u52a1\u540e\uff0c\u53d1\u9001\u4e00\u4e2aFIN\u6765\u7ec8\u6b62\u8fd9\u4e00\u65b9\u5411\u7684\u8fde\u63a5\uff0c\u6536\u5230\u4e00\u4e2aFIN\u53ea\u662f\u610f\u5473\u7740\u8fd9\u4e00\u65b9\u5411\u4e0a\u6ca1\u6709\u6570\u636e\u6d41\u52a8\u4e86\uff0c\u5373\u4e0d\u4f1a\u518d\u6536\u5230\u6570\u636e\u4e86\uff0c\u4f46\u662f\u5728\u8fd9\u4e2aTCP\u8fde\u63a5\u4e0a\u4ecd\u7136\u80fd\u591f\u53d1\u9001\u6570\u636e\uff0c\u76f4\u5230\u8fd9\u4e00\u65b9\u5411\u4e5f\u53d1\u9001\u4e86FIN\u3002\u9996\u5148\u8fdb\u884c\u5173\u95ed\u7684\u4e00\u65b9\u5c06\u6267\u884c\u4e3b\u52a8\u5173\u95ed\uff0c\u800c\u53e6\u4e00\u65b9\u5219\u6267\u884c\u88ab\u52a8\u5173\u95ed\u3002<\/p>\n
1.\u6570\u636e\u4f20\u8f93\u7ed3\u675f\u540e\uff0c\u5ba2\u6237\u7aef\u7684\u5e94\u7528\u8fdb\u7a0b\u53d1\u51fa\u8fde\u63a5\u91ca\u653e\u62a5\u6587\u6bb5\uff0c\u5e76\u505c\u6b62\u53d1\u9001\u6570\u636e\uff0c\u5ba2\u6237\u7aef\u8fdb\u5165FIN_WAIT_1\u72b6\u6001\uff0c\u6b64\u65f6\u5ba2\u6237\u7aef\u4f9d\u7136\u53ef\u4ee5\u63a5\u6536\u670d\u52a1\u5668\u53d1\u9001\u6765\u7684\u6570\u636e\u3002<\/p>\n
2.\u670d\u52a1\u5668\u63a5\u6536\u5230FIN\u540e\uff0c\u53d1\u9001\u4e00\u4e2aACK\u7ed9\u5ba2\u6237\u7aef\uff0c\u786e\u8ba4\u5e8f\u53f7\u4e3a\u6536\u5230\u7684\u5e8f\u53f7+1\uff0c\u670d\u52a1\u5668\u8fdb\u5165CLOSE_WAIT\u72b6\u6001\u3002\u5ba2\u6237\u7aef\u6536\u5230\u540e\u8fdb\u5165FIN_WAIT_2\u72b6\u6001\u3002<\/p>\n
3.\u5f53\u670d\u52a1\u5668\u6ca1\u6709\u6570\u636e\u8981\u53d1\u9001\u65f6\uff0c\u670d\u52a1\u5668\u53d1\u9001\u4e00\u4e2aFIN\u62a5\u6587\uff0c\u6b64\u65f6\u670d\u52a1\u5668\u8fdb\u5165LAST_ACK\u72b6\u6001\uff0c\u7b49\u5f85\u5ba2\u6237\u7aef\u7684\u786e\u8ba4<\/p>\n
4.\u5ba2\u6237\u7aef\u6536\u5230\u670d\u52a1\u5668\u7684FIN\u62a5\u6587\u540e\uff0c\u7ed9\u670d\u52a1\u5668\u53d1\u9001\u4e00\u4e2aACK\u62a5\u6587\uff0c\u786e\u8ba4\u5e8f\u5217\u53f7\u4e3a\u6536\u5230\u7684\u5e8f\u53f7+1\u3002\u6b64\u65f6\u5ba2\u6237\u7aef\u8fdb\u5165TIME_WAIT\u72b6\u6001\uff0c\u7b49\u5f852MSL\uff08MSL\uff1a\u62a5\u6587\u6bb5\u6700\u5927\u751f\u5b58\u65f6\u95f4\uff09\uff0c\u7136\u540e\u5173\u95ed\u8fde\u63a5\u3002<\/p>\n
<pre><code> "“`
\n<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"
“`” \u53c2\u8003\u56de\u7b54\uff1a TCP\u4fdd\u8bc1\u53ef\u9760\u6027\uff1a \uff081\uff09\u5e8f\u5217\u53f7\u3001\u786e\u8ba4\u5e94\u7b54\u3001\u8d85\u65f6\u91cd\u4f20 \u6570\u636e\u5230\u8fbe\u63a5\u6536 […]<\/p>\n","protected":false},"author":7,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[101],"tags":[],"class_list":["post-46208","post","type-post","status-publish","format-standard","hentry","category-c"],"_links":{"self":[{"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/posts\/46208","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/users\/7"}],"replies":[{"embeddable":true,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/comments?post=46208"}],"version-history":[{"count":1,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/posts\/46208\/revisions"}],"predecessor-version":[{"id":46209,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/posts\/46208\/revisions\/46209"}],"wp:attachment":[{"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/media?parent=46208"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/categories?post=46208"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/tags?post=46208"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}