{"id":356,"date":"2021-01-18T20:50:57","date_gmt":"2021-01-18T12:50:57","guid":{"rendered":"http:\/\/blog.cyasylum.top\/?p=356"},"modified":"2021-01-18T20:50:57","modified_gmt":"2021-01-18T12:50:57","slug":"%e8%ae%a1%e7%ae%97%e6%9c%ba%e7%bd%91%e7%bb%9c-%e4%bc%a0%e8%be%93%e5%b1%82","status":"publish","type":"post","link":"http:\/\/blog.cyasylum.top\/index.php\/2021\/01\/18\/%e8%ae%a1%e7%ae%97%e6%9c%ba%e7%bd%91%e7%bb%9c-%e4%bc%a0%e8%be%93%e5%b1%82\/","title":{"rendered":"\u8ba1\u7b97\u673a\u7f51\u7edc-\u4f20\u8f93\u5c42"},"content":{"rendered":"<div class=\"tc-tiddler-body tc-reveal\">\u4f20\u8f93\u5c42\u7684\u529f\u80fd\uff1a<\/p>\n<ul>\n<li>\u4f20\u8f93\u5c42\u63d0\u4f9b\u8fdb\u7a0b\u548c\u8fdb\u7a0b\u4e4b\u95f4\u7684\u903b\u8f91\u901a\u4fe1<\/li>\n<li>\u590d\u7528\u4e0e\u5206\u7528<\/li>\n<li>\u5bf9\u6536\u5230\u62a5\u6587\u8fdb\u884c\u5dee\u9519\u68c0\u6d4b<\/li>\n<\/ul>\n<p>TCP\uff1a\u9762\u5411\u8fde\u63a5\u7684\u4f20\u8f93\u63a7\u5236\u534f\u8baeTCP<\/p>\n<ul>\n<li>\u5728\u4f20\u9001\u6570\u636e\u4e4b\u524d\u5efa\u7acb\u8fde\u63a5\uff0c\u7ed3\u675f\u91ca\u653e\u8fde\u63a5\u3002<\/li>\n<li>\u4e0d\u63d0\u4f9b\u5e7f\u64ad\u548c\u591a\u64ad\u670d\u52a1<\/li>\n<li>\u589e\u52a0\u786e\u8ba4\u3001\u6d41\u91cf\u63a7\u5236\u3001\u8ba1\u65f6\u5668\u53ca\u8fde\u63a5\u7ba1\u7406\u5f00\u9500<\/li>\n<li>\u53ef\u9760\u3001\u9762\u5411\u8fde\u63a5\uff0c\u65f6\u5ef6\u5927\uff0c\u9002\u7528\u4e8e\u5927\u6587\u4ef6<\/li>\n<\/ul>\n<p>UDP\uff1a\u65e0\u8fde\u63a5\u7684\u7528\u6237\u6570\u636e\u62a5\u534f\u8baeUDP<\/p>\n<ul>\n<li>\u4f20\u8f93\u4e0d\u5efa\u7acb\u8fde\u63a5<\/li>\n<li>\u4f20\u8f93\u4e0d\u9700\u8981\u786e\u8ba4<\/li>\n<li>\u4e0d\u53ef\u9760\u3001\u65e0\u8fde\u63a5\u3001\u65f6\u5ef6\u5c0f\u3001\u9002\u7528\u4e8e\u5c0f\u6587\u4ef6<\/li>\n<\/ul>\n<p>\u4f20\u8f93\u5c42\u7684\u5bfb\u5740\u4e0e\u7aef\u53e3<\/p>\n<ul>\n<li>\u590d\u7528\uff1a\u5e94\u7528\u5c42\u7684\u6240\u6709\u8fdb\u7a0b\u90fd\u53ef\u4ee5\u901a\u8fc7\u4f20\u8f93\u5c42\u4f20\u5230\u7f51\u7edc\u5c42<\/li>\n<li>\u5206\u7528\uff1a\u4f20\u8f93\u5c42\u4ece\u7f51\u7edc\u5c42\u6536\u5230\u6570\u636e\u540e\u4ea4\u4ed8\u6307\u660e\u5e94\u7528\u8fdb\u7a0b<\/li>\n<li>\u903b\u8f91\u7aef\u53e3\u662f\u4f20\u8f93\u5c42\u7684SAP\uff0c\u6807\u8bc6\u4e3b\u673a\u4e2d\u7684\u5e94\u7528\u8fdb\u7a0b<\/li>\n<\/ul>\n<p>\u7aef\u53e3\u53f7\u53ea\u6709\u672c\u5730\u610f\u4e49\uff0c\u56e0\u7279\u7f51\u4e2d\u4e0d\u540c\u8ba1\u7b97\u673a\u76f8\u540c\u7aef\u53e3\u65e0\u8054\u7cfb<\/p>\n<p>\u7aef\u53e3\u53f7\u957f\u5ea6\u4e3a16bit\uff0c\u603b\u5171\u670965536\u4e2a\u4e0d\u540c\u7aef\u53e3<\/p>\n<ul>\n<li>\u7aef\u53e3\u53f7\uff08\u6309\u8303\u56f4\u5212\u5206\uff09\n<ul>\n<li>\u670d\u52a1\u7aef\u4f7f\u7528\u7684\u7aef\u53e3\u53f7\n<ul>\n<li>\u719f\u77e5\u7aef\u53e3\u53f7\uff080~1023\uff09\uff1a\u7ed9TCP\/IP\u91cd\u8981\u5e94\u7528\u7a0b\u5e8f\uff0c\u516c\u8ba4\u7aef\u53e3<\/li>\n<li>\u767b\u8bb0\u7aef\u53e3\u53f7\uff081024~49151\uff09\uff1a\u4e3a\u6ca1\u6709\u719f\u77e5\u7aef\u53e3\u53f7\u7684\u5e94\u7528\u7a0b\u5e8f\u4f7f\u7528<\/li>\n<\/ul>\n<\/li>\n<li>\u5ba2\u6237\u7aef\u4f7f\u7528\u7684\u7aef\u53e3\u53f7\uff0849152~65536\uff09\uff1a\u5728\u5ba2\u6237\u8fdb\u7a0b\u8fd0\u884c\u65f6\u52a8\u6001\u9009\u62e9<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p>\u4f7f\u7528\u5957\u63a5\u5b57\u63cf\u8ff0\u7f51\u7edc\u4e2d\u7684\u4e00\u4e2a\u4e3b\u673a\u548c\u5b83\u4e0a\u9762\u7684\u4e00\u4e2a\u8fdb\u7a0b<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/img-blog.csdnimg.cn\/20200630095258962.png\"><\/p>\n<h1 class=\"\">UDP\u534f\u8bae<\/h1>\n<p>UDP\u53ea\u5728IP\u6570\u636e\u62a5\u670d\u52a1\u4e0a\u589e\u52a0\u4e86\u5f88\u5c11\u529f\u80fd\uff0c\u5373\u590d\u7528\u5206\u7528\u548c\u5dee\u9519\u68c0\u6d4b\u529f\u80fd<\/p>\n<h2 class=\"\">UDP\u7684\u4e3b\u8981\u7279\u70b9<\/h2>\n<ul>\n<li>UDP\u662f\u65e0\u8fde\u63a5\u7684\uff0c\u51cf\u5c11\u5f00\u9500\u548c\u53d1\u9001\u6570\u636e\u4e4b\u524d\u7684\u65f6\u5ef6<\/li>\n<li>UDP\u4f7f\u7528\u6700\u5927\u52aa\u529b\u4ea4\u4ed8\uff0c\u5373\u4e0d\u4fdd\u8bc1\u53ef\u9760\u4ea4\u4ed8<\/li>\n<li>UDP\u662f\u9762\u5411\u62a5\u6587\u7684\uff0c\u9002\u5408\u4e00\u6b21\u6027\u4f20\u8f93\u5c11\u91cf\u6570\u636e\u7684\u7f51\u7edc\u5e94\u7528\uff08\u4e0d\u8fdb\u884c\u5207\u7247\uff09<\/li>\n<li>UDP\u65e0\u62e5\u585e\u63a7\u5236\uff0c\u9002\u5408\u5f88\u591a\u5b9e\u65f6\u5e94\u7528<\/li>\n<li>UDP\u9996\u90e8\u5f00\u9500\u5c0f\uff0c\u4e3a8\u5b57\u8282\uff08\u5bf9\u6bd4TCP20\u5b57\u8282\uff09<\/li>\n<\/ul>\n<h2 class=\"\">UDP\u6570\u636e\u62a5\u683c\u5f0f<\/h2>\n<table>\n<tbody>\n<tr class=\"evenRow\">\n<td align=\"center\">16\u4f4d\u6e90\u7aef\u53e3\u53f7 2B<\/td>\n<td align=\"center\">16\u4f4d\u76ee\u7684\u7aef\u53e3\u53f7 2B<\/td>\n<\/tr>\n<tr class=\"oddRow\">\n<td align=\"center\">16\u4f4dUDP\u957f\u5ea6 2B<\/td>\n<td align=\"center\">16\u4f4dUDP\u6821\u9a8c\u548c 2B<\/td>\n<\/tr>\n<tr class=\"evenRow\">\n<td align=\"center\" colspan=\"2\">\u6570\u636e<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h2 class=\"\">UDP\u6821\u9a8c\u8ba1\u7b97<\/h2>\n<ul>\n<li>\u53d1\u9001\u7aef\n<ol>\n<li>\u5c06\u6bcf\u4e00\u884c\uff084\u5b57\u8282\uff09\u62c6\u6210\u4e24\u90e8\u5206\uff0c\u5de6\u53f3\u5e73\u57472\u5b57\u8282\u5927\u5c0f\uff0c\u5c06\u8fd9\u4e24\u5b57\u8282\u6570\u636e\u5199\u6210\u4e8c\u8fdb\u5236\uff0c\u90a3\u4e482\u5b57\u8282\u4e00\u5171\u5c31\u9700\u89812*8=16\u4f4d\u3002\u6b64\u65f6\u68c0\u9a8c\u548c\u6ca1\u6709\u8ba1\u7b97\uff0c\u9ed8\u8ba4\u586b\u51450\uff0c\u540c\u65f6\u5982\u679c\u6570\u636e\u5b57\u6bb5\u4e0d\u6574\u9f50\uff0c\u5219\u75280\u8865\u9f50\uff0c\u8fd9\u6837\u5c31\u53ef\u4ee5\u5199\u51fa\u51e0\u5341\u884c\u4e8c\u8fdb\u5236\u6570\uff0c\u5982\u56fe\u4e2d\u6240\u793a<\/li>\n<li>\u8ba1\u7b97\u7740\u51e0\u5341\u884c\u4e8c\u8fdb\u5236\u6570\u6309\u4e8c\u8fdb\u5236\u53cd\u7801\u8fd0\u7b97\u6c42\u548c\uff0c\u5f97\u5230\u7684\u6700\u540e\u7b80\u4ecb\u518d\u53cd\u7801\uff0c\u4e4b\u540e\u5c06\u53cd\u7801\u4e4b\u540e\u7684\u653e\u5165\u539f\u6765\u7684\u68c0\u9a8c\u548c\u5b57\u6bb5<\/li>\n<\/ol>\n<\/li>\n<li>\u63a5\u6536\u7aef\n<ol>\n<li>\u6309\u7167\u53d1\u9001\u7aef\u7684\u6b65\u9aa4\u518d\u5c06\u6240\u6709\u6570\u636e\u5199\u6210\u4e8c\u8fdb\u5236\u8fdb\u884c\u4e8c\u8fdb\u5236\u53cd\u7801\u8fd0\u7b97\u6c42\u548c<\/li>\n<li>\u5982\u679c\u6700\u540e\u5f97\u5230\u7ed3\u679c\u51681\u5c31\u662f\u6ca1\u95ee\u9898\uff0c\u5426\u5219\u4e22\u5f03<\/li>\n<\/ol>\n<\/li>\n<\/ul>\n<p><img decoding=\"async\" src=\"https:\/\/img-blog.csdnimg.cn\/20200630105526400.png\"><\/p>\n<h1 class=\"\">TCP\u534f\u8bae<\/h1>\n<h2 class=\"\">TCP\u7684\u4e3b\u8981\u7279\u70b9<\/h2>\n<ul>\n<li>TCP\u662f\u9762\u5411\u8fde\u63a5\uff08\u865a\u8fde\u63a5\uff09\u7684\u4f20\u8f93\u5c42\u534f\u8bae<\/li>\n<li>\u6bcf\u4e00\u6761TCP\u8fde\u63a5\u53ea\u6709\u4e24\u4e2a\u7aef\u70b9\uff0c\u53ea\u80fd\u70b9\u5bf9\u70b9<\/li>\n<li>TCP\u63d0\u4f9b\u53ef\u9760\u7684\u4ea4\u4ed8\u670d\u52a1\uff0c\u65e0\u5dee\u9519\u3001\u4e0d\u4e22\u5931\u3001\u65e0\u91cd\u590d\u3001\u6309\u5e8f\u5230\u8fbe\u3002\u53ef\u9760\u6709\u5e8f\u3001\u4e0d\u4e22\u4e0d\u91cd<\/li>\n<li>TCP\u63d0\u4f9b\u5168\u53cc\u5de5\u901a\u4fe1\n<ul>\n<li>\u53d1\u9001\u7f13\u5b58\uff1a\u51c6\u5907\u53d1\u9001\u7684\u6570\u636e&amp;\u5df2\u53d1\u9001\u4f46\u662f\u5c1a\u672a\u6536\u5230\u786e\u8ba4\u7684\u6570\u636e<\/li>\n<li>\u6309\u5e8f\u5230\u8fbe\u4f46\u5c1a\u672a\u88ab\u63a5\u53d7\u5e94\u7528\u7a0b\u5e8f\u8bfb\u53d6\u7684\u6570\u636e&amp;\u4e0d\u6309\u5e8f\u5230\u8fbe\u7684\u6570\u636e<\/li>\n<\/ul>\n<\/li>\n<li>TCP\u9762\u5411\u5b57\u8282\u6d41\uff1aTCP\u628a\u5e94\u7528\u7a0b\u5e8f\u4ea4\u4e0b\u6765\u7684\u6570\u636e\u770b\u6210\u4ec5\u4ec5\u662f\u4e00\u8fde\u4e32\u65e0\u7ed3\u6784\u7684\u5b57\u8282\u6d41\n<ul>\n<li>\u5c06\u6570\u636e\u6d41\u5207\u5206\u7f16\u53f7\u53d1\u9001<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<h2 class=\"\">TCP\u62a5\u6587\u6bb5\u9996\u90e8\u683c\u5f0f<\/h2>\n<p><img decoding=\"async\" src=\"http:\/\/kodo.cyasylum.top\/2021\/01\/05\/17bae2edf0a30.png\"><\/p>\n<ul>\n<li>\u5e8f\u53f7\uff1a\u5728\u4e00\u4e2aTCP\u8fde\u63a5\u4e2d\u4f20\u9001\u7684\u5b57\u8282\u6d41\u4e2d\u7684\u6bcf\u4e00\u4e2a\u5b57\u8282\u90fd\u6309\u987a\u5e8f\u7f16\u53f7\uff0c\u672c\u5b57\u6bb5\u8868\u793a\u672c\u62a5\u6587\u6bb5\u6240\u53d1\u9001\u6570\u636e\u7684\u7b2c\u4e00\u4e2a\u5b57\u8282\u7684\u5e8f\u53f7<\/li>\n<li>\u786e\u8ba4\u53f7\uff1a\u671f\u671b\u6536\u5230\u5bf9\u65b9\u4e0b\u4e00\u4e2a\u62a5\u6587\u6bb5\u7684\u7b2c\u4e00\u4e2a\u6570\u636e\u5b57\u8282\u7684\u5e8f\u53f7\u3002\u82e5\u786e\u8ba4\u53f7\u4e3aN,\u5219\u8bc1\u660e\u5230\u5e8f\u53f7N-1\u4e3a\u6b62\u7684\u6240\u6709\u6570\u636e\u90fd\u5df1\u6b63\u786e\u6536\u5230\u3002<\/li>\n<li>\u6570\u636e\u504f\u79fb\uff08\u9996\u90e8\u957f\u5ea6\uff09\uff1aTCP\u62a5\u6587\u6bb5\u7684\u6570\u636e\u8d77\u59cb\u5904\u8ddd\u79bbTCP\u62a5\u6587\u6bb5\u7684\u8d77\u59cb\u5904\u6709\u591a\u8fdc\uff0c\u4ee54B\u4f4d\u5355\u4f4d\uff0c\u53731\u4e2a\u6570\u503c\u662f4B\u3002<\/li>\n<li>\u63a7\u5236\u4f4d\uff1a\n<ul>\n<li>\u7d27\u6025\u4f4dURG\uff1aURG=1\u65f6\uff0c\u6807\u660e\u6b64\u62a5\u6587\u6bb5\u4e2d\u6709\u7d27\u6025\u6570\u636e\uff0c\u662f\u9ad8\u4f18\u5148\u7ea7\u7684\u6570\u636e\uff0c\u5e94\u5c3d\u5feb\u4f20\u9001\uff0c\u4e0d\u7528\u5728\u7f13\u5b58\u91cc\u6392\u961f\uff0c\u914d\u5408\u7d27\u6025\u6307\u9488\u5b57\u6bb5\u4f7f\u7528\u3002<\/li>\n<li>\u786e\u8ba4\u4f4dACK\uff1aACK=1\u65f6\u786e\u8ba4\u53f7\u6709\u6548\uff0c\u5728\u8fde\u63a5\u5efa\u7acb\u540e\u6240\u6709\u4f20\u9001\u7684\u62a5\u6587\u6bb5\u90fd\u5fc5\u987b\u628aACK\u7f6e\u4e3a1.<\/li>\n<li>\u63a8\u9001\u4f4dPSH\uff1aPSH=1\u65f6\uff0c\u63a5\u6536\u65b9\u5c3d\u5feb\u4ea4\u4ed8\u63a5\u6536\u5e94\u7528\u8fdb\u7a0b\uff0c\u4e0d\u518d\u7b49\u5230\u7f13\u5b58\u586b\u6ee1\u518d\u5411\u4e0a\u4ea4\u4ed8\u3002<\/li>\n<li>\u590d\u4f4dRST\uff1aRST=1\u65f6\uff0c\u8868\u660eTCP\u8fde\u63a5\u4e2d\u51fa\u73b0\u4e25\u91cd\u5dee\u9519\uff0c\u5fc5\u987b\u91ca\u653e\u8fde\u63a5\uff0c\u7136\u540e\u518d\u91cd\u65b0\u5efa\u7acb\u4f20\u8f93\u94fe\u63a5\u3002<\/li>\n<li>\u540c\u6b65\u4f4dSYN\uff1aSYN=1\u65f6\uff0c\u8868\u660e\u662f\u4e00\u4e2a\u8fde\u63a5\u8bf7\u6c42\/\u8fde\u63a5\u63a5\u53d7\u62a5\u6587\u3002<\/li>\n<li>\u7ec8\u6b62\u4f4dFIN\uff1aFIN=1\u65f6\uff0c\u8868\u660e\u6b64\u62a5\u6587\u6bb5\u53d1\u9001\u65b9\u6570\u636e\u5df2\u53d1\u5b8c\uff0c\u8981\u6c42\u91ca\u653e\u8fde\u63a5\u3002<\/li>\n<\/ul>\n<\/li>\n<li>\u7a97\u53e3\uff1a\u6307\u53d1\u9001\u62a5\u6587\u6bb5\u4e00\u65b9\u7684\u63a5\u53d7\u7a97\u53e3\uff0c\u63a7\u5236\u53d1\u9001\u65b9\u53d1\u9001\u7f13\u5b58\u5927\u5c0f\u3002<\/li>\n<li>\u6821\u9a8c\u548c\uff1a\u68c0\u9a8c\u9996\u90e8\u52a0\u6570\u636e\u6821\u9a8c\uff0c\u52a0\u5165\u4f2a\u9996\u90e8\uff0c\u7b2c\u56db\u5b57\u6bb5\u4e3a6<\/li>\n<li>\u7d27\u6025\u6307\u9488\uff1aURG=1\u65f6\u6709\u610f\u4e49<\/li>\n<li>\u9009\u9879\uff1a\u6700\u5927\u62a5\u6587\u6bb5\u957f\u5ea6\u3001\u7a97\u53e3\u6269\u5927\u3001\u65f6\u95f4\u6233\u3001\u9009\u62e9\u786e\u8ba4\u00b7\u00b7\u00b7<\/li>\n<\/ul>\n<h2 class=\"\">TCP\u8fde\u63a5\u7ba1\u7406<\/h2>\n<ul>\n<li>\u8fde\u63a5\u5efa\u7acb<\/li>\n<li>\u6570\u636e\u4f20\u9001<\/li>\n<li>\u8fde\u63a5\u91ca\u653e<\/li>\n<\/ul>\n<p>\u5ba2\u6237&amp;\u670d\u52a1\u5668\u65b9\u5f0f\u3002\u4e3b\u52a8\u53d1\u8d77\u8fde\u63a5\u5efa\u7acb\u7684\u5e94\u7528\u8fdb\u7a0b\u53eb\u505a\u5ba2\u6237\uff0c\u800c\u88ab\u52a8\u7b49\u5f85\u8fde\u63a5\u5efa\u7acb\u7684\u5e94\u7528\u8fdb\u7a0b\u53eb\u670d\u52a1\u5668\u3002<\/p>\n<h3 class=\"\">TCP\u7684\u8fde\u63a5\u5efa\u7acb<\/h3>\n<p>\u4e09\u6b21\u63e1\u624b<\/p>\n<ul>\n<li>\u5ba2\u6237\u7aef\u53d1\u9001\u8fde\u63a5\u8bf7\u6c42\u62a5\u6587\u6bb5\uff0c\u65e0\u5e94\u7528\u5c42\u6570\u636e\n<ul>\n<li>SYN=1\uff0cseq=x(rand)<\/li>\n<\/ul>\n<\/li>\n<li>\u670d\u52a1\u5668\u53cd\u9988\u786e\u8ba4\u62a5\u6587\u6bb5\u5141\u8bb8\u8fde\u63a5\uff0c\u4e3aTCP\u8fde\u63a5\u5206\u914d\u7f13\u5b58\u548c\u53d8\u91cf\uff0c\u65e0\u5e94\u7528\u5c42\u6570\u636e\n<ul>\n<li>SYN=1\uff0cACK=1\uff0cseq=y(rand)\uff0cack=x+1<\/li>\n<\/ul>\n<\/li>\n<li>\u5ba2\u6237\u7aef\u8fd4\u56de\u786e\u8ba4\u7684\u786e\u8ba4\uff0c\u5206\u914d\u7f13\u5b58\u548c\u53d8\u91cf\uff0c\u53ef\u4ee5\u643a\u5e26\u6570\u636e\u3002\n<ul>\n<li>SYN=0\uff0cACK=1\uff0cseq=x+1\uff0cack=y+1<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<blockquote class=\"tc-quote\">\n<p>SYN\u6d2a\u8303\u653b\u51fb\uff1a<\/p>\n<p>\u53d1\u751f\u5728OSl\u7b2c\u56db\u5c42\uff0c\u8fd9\u79cd\u65b9\u5f0f\u5229\u7528TCP\u534f\u8bae\u7684\u7279\u6027\uff0c\u5c31\u662f\u4e09\u6b21\u63e1\u624b\u3002\u653b\u51fb\u8005\u53d1\u9001TCP SYN,SYN\u662fTCP\u4e09\u6b21\u63e1\u624b\u4e2d\u7684\u7b2c\u4e00\u4e2a\u6570\u636e\u5305\uff0c\u800c\u5f53\u670d\u52a1\u5668\u8fd4\u56deACK\u540e\uff0c\u8be5\u653b\u51fb\u8005\u5c31\u4e0d\u5bf9\u5176\u8fdb\u884c\u518d\u786e\u8ba4\uff0c\u90a3\u8fd9\u4e2aTCP\u8fde\u63a5\u5c31\u5904\u4e8e\u6302\u8d77\u72b6\u6001\uff0c\u4e5f\u5c31\u662f\u6240\u8c13\u7684\u534a\u8fde\u63a5\u72b6\u6001\uff0c\u670d\u52a1\u5668\u6536\u4e0d\u5230\u518d\u786e\u8ba4\u7684\u8bdd\uff0c\u8fd8\u4f1a\u91cd\u590d\u53d1\u9001ACK\u7ed9\u653b\u51fb\u8005\u3002\u8fd9\u6837\u66f4\u52a0\u4f1a\u6d6a\u8d39\u670d\u52a1\u5668\u7684\u8d44\u6e90\u3002\u653b\u51fb\u8005\u5c31\u5bf9\u670d\u52a1\u5668\u53d1\u9001\u975e\u5e38\u5927\u91cf\u7684\u8fd9\u79cdTcP\u8fde\u63a5\uff0c\u7531\u4e8e\u6bcf\u4e00\u4e2a\u90fd\u6ca1\u6cd5\u5b8c\u6210\u4e09\u6b21\u63e1\u624b\uff0c\u6240\u4ee5\u5728\u670d\u52a1\u5668\u4e0a\uff0c\u8fd9\u4e9bTCP\u8fde\u63a5\u4f1a\u56e0\u4e3a\u6302\u8d77\u72b6\u6001\u800c\u6d88\u8017CPU\u548c\u5185\u5b58\uff0c\u6700\u540e\u670d\u52a1\u5668\u53ef\u80fd\u6b7b\u673a\uff0c\u5c31\u65e0\u6cd5\u4e3a\u6b63\u5e38\u7528\u6237\u63d0\u4f9b\u670d\u52a1\u4e86\u3002\n<\/p>\n<\/blockquote>\n<h3 class=\"\">TCP\u7684\u8fde\u63a5\u91ca\u653e<\/h3>\n<p>\u56db\u6b21\u63e1\u624b<\/p>\n<ul>\n<li>\u5ba2\u6237\u7aef\u53d1\u9001\u8fde\u63a5\u91ca\u653e\u62a5\u6587\u6bb5\uff0c\u505c\u6b62\u53d1\u9001\u6570\u636e\uff0c\u4e3b\u52a8\u5173\u95edTCP\u8fde\u63a5\n<ul>\n<li>FIN=1\uff0cseq=u<\/li>\n<\/ul>\n<\/li>\n<li>\u670d\u52a1\u7aef\u8fd4\u56de\u786e\u8ba4\u62a5\u6587\u6bb5\uff0c\u5ba2\u6237\u5230\u670d\u52a1\u5668\u65b9\u5411\u8fde\u63a5\u91ca\u653e\u5b8c\u6210\n<ul>\n<li>ACK=1\uff0cseq=v\uff0cack=u+1<\/li>\n<\/ul>\n<\/li>\n<li>\u670d\u52a1\u5668\u53d1\u5b8c\u6570\u636e\uff0c\u53d1\u9001\u8fde\u63a5\u91ca\u653e\u62a5\u6587\u6bb5\uff0c\u4e3b\u52a8\u5173\u95edTCP\u8fde\u63a5\n<ul>\n<li>FIN=1\uff0cACK=1\uff0cseq=w\uff0cack=u+1<\/li>\n<\/ul>\n<\/li>\n<li>\u5ba2\u6237\u7aef\u56de\u9001\u4e00\u4e2a\u786e\u8ba4\u62a5\u6587\u6bb5\uff0c\u518d\u7b49\u5230\u8ba1\u65f6\u5668\u8bbe\u7f6e2MSL(\u6700\u957f\u62a5\u6587\u6bb5\u5bff\u547d)\u540e\u5f7b\u5e95\u5173\u95ed\u8fde\u63a5\n<ul>\n<li>ACK=1\uff0cseq=u+1\uff0cack=w+1<\/li>\n<li>\u786e\u5b9a\u670d\u52a1\u5668\u5df2\u6536\u5230\u786e\u8ba4\u62a5\u6587\u6bb5\uff0c\u6ca1\u6709\u518d\u6b21\u8bf7\u6c42<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<h2 class=\"\">TCP\u53ef\u9760\u4f20\u8f93<\/h2>\n<p>\u4fdd\u8bc1\u63a5\u6536\u65b9\u8fdb\u7a0b\u4ece\u7f13\u5b58\u533a\u8bfb\u53d6\u7684\u5b57\u8282\u6d41\u4e0e\u53d1\u9001\u65b9\u53d1\u51fa\u7684\u5b57\u8282\u6d41\u5b8c\u5168\u4e00\u6837<\/p>\n<ul>\n<li>\u6821\u9a8c\n<ul>\n<li>\u6dfb\u52a0\u4f2a\u9996\u90e8\u6821\u9a8c<\/li>\n<\/ul>\n<\/li>\n<li>\u5e8f\u53f7\n<ul>\n<li>\u4fdd\u8bc1\u987a\u5e8f\u63d0\u4ea4\u53d1\u9001<\/li>\n<\/ul>\n<\/li>\n<li>\u786e\u8ba4\u91cd\u4f20\n<ul>\n<li>\u672a\u786e\u8ba4\u81ea\u52a8\u91cd\u4f20<\/li>\n<li>\u4f7f\u7528\u52a8\u6001\u81ea\u9002\u5e94\u7b97\u6cd5\u6539\u53d8\u91cd\u4f20\u65f6\u95f4RTTs(\u52a0\u6743\u5e73\u5747\u5f80\u8fd4\u65f6\u95f4)<\/li>\n<li>\u5197\u4f59\u786e\u8ba4\uff0c\u5728\u6536\u5230\u6bd4\u671f\u671b\u5e8f\u53f7\u5927\u7684\u5931\u5e8f\u62a5\u6587\u6bb5\u5230\u8fbe\u65f6\uff0c\u53d1\u9001\u5197\u4f59ACK\u6807\u8bc6\u4e0b\u4e00\u4e2a\u671f\u5f85\u5b57\u8282\u6d41\u7684\u5e8f\u53f7\uff0c\u53d1\u9001\u65b9\u6536\u5230\u4e09\u4e2a\u5197\u4f59ACK\u5219\u786e\u8ba4\u62a5\u6587\u6bb5\u4e22\u5931\uff0c\u8fdb\u884c\u91cd\u4f20<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<h2 class=\"\">TCP\u6d41\u91cf\u63a7\u5236<\/h2>\n<p>TCP\u4f7f\u7528\u6ed1\u52a8\u7a97\u53e3\u673a\u5236\u5b9e\u73b0\u6d41\u91cf\u63a7\u5236<\/p>\n<p>\u901a\u4fe1\u8fc7\u7a0b\u4e2d\uff0c\u63a5\u6536\u65b9\u6839\u636e\u81ea\u5df1\u63a5\u6536\u7f13\u5b58\u7684\u5927\u5c0f\uff0c\u52a8\u6001\u8c03\u6574\u53d1\u9001\u65b9\u7684\u53d1\u9001\u7a97\u53e3\u5927\u5c0f\uff0c\u5373\u544a\u77e5\u63a5\u6536\u7a97\u53e3rwnd\uff08\u8bbe\u7f6e\u786e\u8ba4\u62a5\u6587\u6bb5\u4e2d\u7684\u7a97\u53e3\u5b57\u6bb5\u901a\u77e5\uff09\u3002\u53d1\u9001\u65b9\u53d1\u9001\u7a97\u53e3\u53d6\u63a5\u6536\u7a97\u53e3rwnd\u548c\u62e5\u585e\u7a97\u53e3cwnd\u7684\u6700\u5c0f\u503c\u3002<\/p>\n<p>\u63a5\u6536\u65b9\u53ef\u4ee5\u53d1\u90010\u7a97\u53e3rwnd\u8ba9\u53d1\u9001\u65b9\u6682\u505c\u53d1\u9001\u6570\u636e\uff0c\u53d1\u9001\u65b9\u6536\u5230\u8bbe\u7f6e\u8ba1\u65f6\u5668\uff0c\u82e5\u8bbe\u7f6e\u65f6\u95f4\u5230\u671f\u5219\u53d1\u9001\u96f6\u7a97\u53e3\u63a2\u6d4b\u62a5\u6587\u6bb5\uff0c\u63a5\u6536\u65b9\u6536\u5230\u63a2\u6d4b\u5219\u8fd4\u56de\u5f53\u524d\u63a5\u6536\u7a97\u53e3\u503c<\/p>\n<h2 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