{"id":9,"date":"2026-02-14T02:55:45","date_gmt":"2026-02-14T02:55:45","guid":{"rendered":"http:\/\/106.13.211.205\/?p=9"},"modified":"2026-03-26T06:47:13","modified_gmt":"2026-03-26T06:47:13","slug":"java","status":"publish","type":"post","link":"https:\/\/ccc333.cn\/index.php\/2026\/02\/14\/java\/","title":{"rendered":"TCP \u7684\u4e09\u6b21\u63e1\u624b\u56db\u6b21\u6325\u624b\u8fc7\u7a0b"},"content":{"rendered":"\n<h4 class=\"wp-block-heading\" id=\"a3ac3d2f\"><strong>\u7b2c\u4e00\u90e8\u5206\uff1a\u6838\u5fc3\u6982\u5ff5\u4e0e\u80cc\u666f<\/strong><\/h4>\n\n\n\n<p id=\"u7de389a4\">\u5728\u5f00\u59cb\u4e4b\u524d\uff0c\u5148\u660e\u786e\u51e0\u4e2a\u5173\u952e\u70b9\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>TCP \u662f\u4ec0\u4e48<\/strong>\uff1a\u4f20\u8f93\u63a7\u5236\u534f\u8bae\uff0c\u662f\u4e00\u79cd<strong>\u9762\u5411\u8fde\u63a5\u7684\u3001\u53ef\u9760\u7684\u3001\u57fa\u4e8e\u5b57\u8282\u6d41<\/strong>\u7684\u4f20\u8f93\u5c42\u901a\u4fe1\u534f\u8bae\u3002<\/li>\n\n\n\n<li><strong>\u201c\u8fde\u63a5\u201d\u662f\u4ec0\u4e48<\/strong>\uff1aTCP \u7684\u8fde\u63a5\u5e76\u975e\u7269\u7406\u4e0a\u7684\u7535\u8def\uff0c\u800c\u662f\u901a\u4fe1\u53cc\u65b9\u5728\u5185\u5b58\u4e2d\u7ef4\u62a4\u7684\u4e00\u79cd<strong>\u72b6\u6001\u4fe1\u606f<\/strong>\uff08\u5982\u5e8f\u5217\u53f7\u3001\u7a97\u53e3\u5927\u5c0f\u7b49\uff09\u3002\u5efa\u7acb\u8fde\u63a5\u5c31\u662f<strong>\u540c\u6b65\u53cc\u65b9\u7684\u521d\u59cb\u72b6\u6001<\/strong>\u3002<\/li>\n\n\n\n<li><strong>\u6807\u5fd7\u4f4d<\/strong>\uff1aTCP \u5934\u90e8\u4e2d\u6709\u51e0\u4e2a\u91cd\u8981\u7684\u63a7\u5236\u4f4d\uff0c\u5728\u63e1\u624b\u6325\u624b\u4e2d\u8d77\u5230\u5173\u952e\u4f5c\u7528\uff1a<\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\n<ul class=\"wp-block-list\">\n<li><strong>SYN<\/strong>\uff1a\u540c\u6b65\u5e8f\u5217\u53f7\uff0c\u7528\u4e8e<strong>\u5efa\u7acb\u8fde\u63a5<\/strong>\u3002<\/li>\n\n\n\n<li><strong>ACK<\/strong>\uff1a\u786e\u8ba4\uff0c\u8868\u793a\u786e\u8ba4\u53f7\u5b57\u6bb5\u6709\u6548\u3002<\/li>\n\n\n\n<li><strong>FIN<\/strong>\uff1a\u7ec8\u6b62\uff0c\u7528\u4e8e<strong>\u5173\u95ed\u8fde\u63a5<\/strong>\u3002<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>\u5e8f\u5217\u53f7\u4e0e\u786e\u8ba4\u53f7<\/strong>\uff1a<\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\n<ul class=\"wp-block-list\">\n<li><strong>\u5e8f\u5217\u53f7<\/strong>\uff1a\u6807\u8bc6\u53d1\u9001\u7684\u6570\u636e\u5b57\u8282\u6d41\u7684\u987a\u5e8f\u3002<\/li>\n\n\n\n<li><strong>\u786e\u8ba4\u53f7<\/strong>\uff1a\u671f\u671b\u6536\u5230\u5bf9\u65b9\u4e0b\u4e00\u4e2a\u62a5\u6587\u6bb5\u7684\u7b2c\u4e00\u4e2a\u6570\u636e\u5b57\u8282\u7684\u5e8f\u5217\u53f7\uff0c\u8868\u793a\u6b64\u5e8f\u53f7\u4e4b\u524d\u7684\u6570\u636e\u5df2\u6210\u529f\u63a5\u6536\u3002<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"2a3c9f1a\"><a><\/a><strong>\u7b2c\u4e8c\u90e8\u5206\uff1a\u4e09\u6b21\u63e1\u624b \u2014 \u5efa\u7acb\u8fde\u63a5<\/strong><\/h4>\n\n\n\n<p id=\"u66a27b52\"><a href=\"https:\/\/so.csdn.net\/so\/search?q=%E4%B8%89%E6%AC%A1%E6%8F%A1%E6%89%8B&amp;spm=1001.2101.3001.7020\" target=\"_blank\" rel=\"noreferrer noopener\">\u4e09\u6b21\u63e1\u624b<\/a>\u7684\u6839\u672c\u76ee\u7684\u662f\uff1a<strong>\u540c\u6b65\u53cc\u65b9\u7684\u521d\u59cb\u5e8f\u5217\u53f7\uff0c\u5e76\u4ea4\u6362\u5176\u4ed6\u53c2\u6570\uff0c\u4e3a\u53ef\u9760\u6570\u636e\u4f20\u8f93\u505a\u51c6\u5907<\/strong>\u3002\u540c\u65f6\uff0c\u5b83\u4e5f\u8bc1\u660e\u4e86\u53cc\u65b9\u90fd\u5177\u6709<strong>\u53d1\u9001\u548c\u63a5\u6536<\/strong>\u7684\u80fd\u529b\u3002<\/p>\n\n\n\n<p id=\"u2ae509f2\">\u5047\u8bbe\u5ba2\u6237\u7aef\uff08Client\uff09\u4e3b\u52a8\u53d1\u8d77\u8fde\u63a5\uff0c\u670d\u52a1\u5668\uff08Server\uff09\u7b49\u5f85\u8fde\u63a5\u3002<\/p>\n\n\n\n<p id=\"u73c5e45f\"><strong>\u7b2c\u4e00\u6b65\uff1a\u7b2c\u4e00\u6b21\u63e1\u624b\uff08Client -&gt; Server\uff09<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u5ba2\u6237\u7aef\u53d1\u9001\u4e00\u4e2a TCP \u62a5\u6587\u6bb5\u3002<\/li>\n\n\n\n<li>\u8bbe\u7f6e\u6807\u5fd7\u4f4d\u00a0<strong>SYN = 1<\/strong>\uff0c\u8868\u793a\u8fd9\u662f\u8fde\u63a5\u8bf7\u6c42\u3002<\/li>\n\n\n\n<li>\u540c\u65f6\uff0c\u5ba2\u6237\u7aef\u4f1a<strong>\u968f\u673a\u751f\u6210\u4e00\u4e2a\u521d\u59cb\u5e8f\u5217\u53f7<\/strong><strong>\u00a0<\/strong><code><strong>client_isn<\/strong><\/code>\uff0c\u653e\u5728\u5e8f\u5217\u53f7\u5b57\u6bb5\u4e2d\u3002<\/li>\n\n\n\n<li>\u6b64\u65f6\u4e0d\u643a\u5e26\u5e94\u7528\u5c42\u6570\u636e\u3002<\/li>\n\n\n\n<li><strong>\u5ba2\u6237\u7aef\u72b6\u6001<\/strong>\uff1a\u4ece\u00a0<code>CLOSED<\/code>\u00a0\u8fdb\u5165\u00a0<code>SYN-SENT<\/code>\uff08\u540c\u6b65\u5df2\u53d1\u9001\uff09\u3002<\/li>\n<\/ul>\n\n\n\n<p id=\"u265fa1aa\"><strong>\u7b2c\u4e8c\u6b65\uff1a\u7b2c\u4e8c\u6b21\u63e1\u624b\uff08Server -&gt; Client\uff09<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u670d\u52a1\u5668\u6536\u5230 SYN \u62a5\u6587\u540e\uff0c\u5982\u679c\u540c\u610f\u5efa\u7acb\u8fde\u63a5\uff0c\u5219\u4f1a\u56de\u590d\u4e00\u4e2a\u62a5\u6587\u6bb5\u3002<\/li>\n\n\n\n<li>\u8bbe\u7f6e\u6807\u5fd7\u4f4d\u00a0<strong>SYN = 1<\/strong>\u00a0\u548c\u00a0<strong>ACK = 1<\/strong>\u3002<\/li>\n\n\n\n<li>\u670d\u52a1\u5668\u4e5f\u4f1a<strong>\u968f\u673a\u751f\u6210\u81ea\u5df1\u7684\u521d\u59cb\u5e8f\u5217\u53f7<\/strong><strong>\u00a0<\/strong><code><strong>server_isn<\/strong><\/code>\uff0c\u653e\u5728\u5e8f\u5217\u53f7\u5b57\u6bb5\u4e2d\u3002<\/li>\n\n\n\n<li>\u786e\u8ba4\u53f7\u5b57\u6bb5\u8bbe\u7f6e\u4e3a\u00a0<code>client_isn + 1<\/code>\uff0c\u8868\u793a\u201c\u6211\u5df2\u6536\u5230\u4f60\u7684\u5e8f\u5217\u53f7\u4e3a\u00a0<code>client_isn<\/code>\u00a0\u7684 SYN \u5305\uff0c\u671f\u5f85\u4e0b\u4e00\u4e2a\u6570\u636e\u4ece\u00a0<code>client_isn + 1<\/code>\u00a0\u5f00\u59cb\u201d\u3002<\/li>\n\n\n\n<li>\u6b64\u65f6\u53ef\u4ee5\u643a\u5e26\u6216\u4e0d\u643a\u5e26\u5e94\u7528\u5c42\u6570\u636e\uff08\u4f46\u901a\u5e38\u4e0d\u643a\u5e26\uff09\u3002<\/li>\n\n\n\n<li><strong>\u670d\u52a1\u5668\u72b6\u6001<\/strong>\uff1a\u4ece\u00a0<code>LISTEN<\/code>\u00a0\u8fdb\u5165\u00a0<code>SYN-RCVD<\/code>\uff08\u540c\u6b65\u5df2\u6536\u5230\uff09\u3002<\/li>\n<\/ul>\n\n\n\n<p id=\"u8a4fce67\"><strong>\u7b2c\u4e09\u6b65\uff1a\u7b2c\u4e09\u6b21\u63e1\u624b\uff08Client -&gt; Server\uff09<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u5ba2\u6237\u7aef\u6536\u5230\u670d\u52a1\u5668\u7684 SYN-ACK \u62a5\u6587\u540e\uff0c\u4f1a\u518d\u53d1\u9001\u4e00\u4e2a\u786e\u8ba4\u62a5\u6587\u3002<\/li>\n\n\n\n<li>\u8bbe\u7f6e\u6807\u5fd7\u4f4d\u00a0<strong>ACK = 1<\/strong>\u3002<\/li>\n\n\n\n<li>\u5e8f\u5217\u53f7\u5b57\u6bb5\u8bbe\u7f6e\u4e3a\u00a0<code>client_isn + 1<\/code>\uff08\u56e0\u4e3a\u7b2c\u4e00\u6b21\u63e1\u624b\u6d88\u8017\u4e86\u4e00\u4e2a\u5e8f\u5217\u53f7\uff09\u3002<\/li>\n\n\n\n<li>\u786e\u8ba4\u53f7\u5b57\u6bb5\u8bbe\u7f6e\u4e3a\u00a0<code>server_isn + 1<\/code>\uff0c\u8868\u793a\u201c\u6211\u5df2\u6536\u5230\u4f60\u7684\u5e8f\u5217\u53f7\u4e3a\u00a0<code>server_isn<\/code>\u00a0\u7684 SYN \u5305\u201d\u3002<\/li>\n\n\n\n<li>\u6b64\u62a5\u6587<strong>\u53ef\u4ee5\u643a\u5e26\u5e94\u7528\u5c42\u6570\u636e<\/strong>\uff08\u8fde\u63a5\u5efa\u7acb\u540e\u5373\u53ef\u5f00\u59cb\u4f20\u8f93\uff09\u3002<\/li>\n\n\n\n<li><strong>\u5ba2\u6237\u7aef\u72b6\u6001<\/strong>\uff1a\u4ece\u00a0<code>SYN-SENT<\/code>\u00a0\u8fdb\u5165\u00a0<code>ESTABLISHED<\/code>\uff08\u5df2\u5efa\u7acb\u8fde\u63a5\uff09\u3002<\/li>\n\n\n\n<li>\u670d\u52a1\u5668\u6536\u5230\u8fd9\u4e2a ACK \u540e\uff0c\u72b6\u6001\u4e5f\u4ece\u00a0<code>SYN-RCVD<\/code>\u00a0\u8fdb\u5165\u00a0<code>ESTABLISHED<\/code>\u3002<\/li>\n<\/ul>\n\n\n\n<p id=\"u1c95b9db\"><strong>\u4e3a\u4ec0\u4e48\u662f\u4e09\u6b21\uff0c\u800c\u4e0d\u662f\u4e24\u6b21\uff1f<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>\u6839\u672c\u539f\u56e0<\/strong>\uff1a<strong>\u9632\u6b62\u5df2\u5931\u6548\u7684\u8fde\u63a5\u8bf7\u6c42\u62a5\u6587\u7a81\u7136\u5230\u8fbe\uff0c\u5bfc\u81f4\u8d44\u6e90\u6d6a\u8d39\u548c\u9519\u8bef\u3002<\/strong><\/li>\n\n\n\n<li><strong>\u7ecf\u5178\u573a\u666f<\/strong>\uff1a\u5ba2\u6237\u7aef\u53d1\u9001\u4e86\u4e00\u4e2a SYN \u62a5\u6587\uff0c\u4f46\u7531\u4e8e\u7f51\u7edc\u62e5\u5835\uff0c\u8fdf\u8fdf\u672a\u5230\u8fbe\u670d\u52a1\u5668\u3002\u5ba2\u6237\u7aef\u8d85\u65f6\u91cd\u4f20\u4e86\u4e00\u4e2a\u65b0\u7684 SYN \u5e76\u6210\u529f\u5efa\u7acb\u4e86\u8fde\u63a5\u3001\u4f20\u8f93\u6570\u636e\u3001\u5173\u95ed\u8fde\u63a5\u3002\u6b64\u65f6\uff0c\u90a3\u4e2a\u5931\u6548\u7684\u65e7 SYN \u62a5\u6587\u7ec8\u4e8e\u5230\u8fbe\u4e86\u670d\u52a1\u5668\u3002\u5982\u679c\u53ea\u7528\u4e24\u6b21\u63e1\u624b\uff0c\u670d\u52a1\u5668\u4f1a\u8ba4\u4e3a\u8fd9\u662f\u4e00\u4e2a\u65b0\u7684\u8fde\u63a5\u8bf7\u6c42\uff0c\u76f4\u63a5\u8fdb\u5165\u00a0<code>ESTABLISHED<\/code>\u00a0\u72b6\u6001\uff0c\u5e76\u5206\u914d\u8d44\u6e90\u7b49\u5f85\u5ba2\u6237\u7aef\u53d1\u9001\u6570\u636e\uff0c\u4f46\u5ba2\u6237\u7aef\u65e9\u5df2\u5173\u95ed\uff0c\u4e0d\u4f1a\u53d1\u9001\u4efb\u4f55\u6570\u636e\u3002\u8fd9\u5c31\u9020\u6210\u4e86<strong>\u670d\u52a1\u5668\u7684\u8d44\u6e90\u88ab\u767d\u767d\u5360\u7528<\/strong>\u3002<\/li>\n\n\n\n<li><strong>\u4e09\u6b21\u63e1\u624b\u7684\u4f5c\u7528<\/strong>\uff1a\u5728\u4e24\u6b21\u63e1\u624b\u7684\u60c5\u51b5\u4e0b\uff0c\u670d\u52a1\u5668\u4f1a\u76f4\u63a5\u5efa\u7acb\u8fde\u63a5\u3002\u800c\u91c7\u7528\u4e09\u6b21\u63e1\u624b\uff0c\u670d\u52a1\u5668\u5728\u6536\u5230\u5931\u6548\u7684 SYN \u540e\uff0c\u4f1a\u56de\u590d SYN-ACK\uff0c\u4f46\u5ba2\u6237\u7aef\uff08\u56e0\u4e3a\u5df2\u7ecf\u5173\u95ed\uff09\u4e0d\u4f1a\u56de\u590d\u6700\u7ec8\u7684 ACK\uff0c\u56e0\u6b64\u670d\u52a1\u5668\u5728\u00a0<code>SYN-RCVD<\/code>\u00a0\u72b6\u6001\u7b49\u5f85\u4e00\u6bb5\u65f6\u95f4\u540e\uff0c\u4f1a\u56e0\u6536\u4e0d\u5230 ACK \u800c\u5173\u95ed\u8fd9\u4e2a\u534a\u8fde\u63a5\uff0c\u4ece\u800c\u907f\u514d\u8d44\u6e90\u6d6a\u8d39\u3002<\/li>\n<\/ul>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"95680c42\"><a><\/a><strong>\u7b2c\u4e09\u90e8\u5206\uff1a\u56db\u6b21\u6325\u624b \u2014 \u5173\u95ed\u8fde\u63a5<\/strong><\/h4>\n\n\n\n<p id=\"uaff69ab7\"><a href=\"https:\/\/so.csdn.net\/so\/search?q=%E5%9B%9B%E6%AC%A1%E6%8C%A5%E6%89%8B&amp;spm=1001.2101.3001.7020\" target=\"_blank\" rel=\"noreferrer noopener\">\u56db\u6b21\u6325\u624b<\/a>\u7684\u76ee\u7684\u662f\uff1a<strong>\u53cc\u65b9\u90fd\u786e\u8ba4\u6ca1\u6709\u6570\u636e\u9700\u8981\u53d1\u9001\u4e86\uff0c\u7136\u540e\u5b89\u5168\u5730\u5173\u95ed\u8fde\u63a5<\/strong>\u3002\u7531\u4e8e TCP \u8fde\u63a5\u662f<strong>\u5168\u53cc\u5de5<\/strong>\u7684\uff08\u53ef\u4ee5\u540c\u65f6\u72ec\u7acb\u5730\u8fdb\u884c\u53cc\u5411\u6570\u636e\u4f20\u8f93\uff09\uff0c\u56e0\u6b64\u6bcf\u4e2a\u65b9\u5411\u90fd\u5fc5\u987b\u5355\u72ec\u5173\u95ed\u3002<\/p>\n\n\n\n<p id=\"ua7337306\">\u5047\u8bbe\u5ba2\u6237\u7aef\u4e3b\u52a8\u53d1\u8d77\u5173\u95ed\u3002<\/p>\n\n\n\n<p id=\"u1f5d66ef\"><strong>\u7b2c\u4e00\u6b65\uff1a\u7b2c\u4e00\u6b21\u6325\u624b\uff08Client -&gt; Server\uff09<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u5ba2\u6237\u7aef\u5e94\u7528\u7a0b\u5e8f\u8c03\u7528\u00a0<code>close()<\/code>\u00a0\u65b9\u6cd5\uff0c\u53d1\u9001\u4e00\u4e2a TCP \u62a5\u6587\u6bb5\u3002<\/li>\n\n\n\n<li>\u8bbe\u7f6e\u6807\u5fd7\u4f4d\u00a0<strong>FIN = 1<\/strong>\u3002<\/li>\n\n\n\n<li>\u643a\u5e26\u4e00\u4e2a\u5f53\u524d\u7684\u5e8f\u5217\u53f7\u00a0<code>seq = u<\/code>\u3002<\/li>\n\n\n\n<li><strong>\u5ba2\u6237\u7aef\u72b6\u6001<\/strong>\uff1a\u4ece\u00a0<code>ESTABLISHED<\/code>\u00a0\u8fdb\u5165\u00a0<code>FIN-WAIT-1<\/code>\uff08\u7ec8\u6b62\u7b49\u5f851\uff09\u3002<\/li>\n<\/ul>\n\n\n\n<p id=\"ufeedea26\"><strong>\u7b2c\u4e8c\u6b65\uff1a\u7b2c\u4e8c\u6b21\u6325\u624b\uff08Server -&gt; Client\uff09<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u670d\u52a1\u5668\u6536\u5230 FIN \u62a5\u6587\u540e\uff0c\u7acb\u5373\u56de\u590d\u4e00\u4e2a\u786e\u8ba4\u62a5\u6587\u3002<\/li>\n\n\n\n<li>\u8bbe\u7f6e\u6807\u5fd7\u4f4d\u00a0<strong>ACK = 1<\/strong>\u3002<\/li>\n\n\n\n<li>\u786e\u8ba4\u53f7\u8bbe\u7f6e\u4e3a\u00a0<code>u + 1<\/code>\u3002<\/li>\n\n\n\n<li>\u6b64\u65f6\uff0c<strong>\u4ece\u5ba2\u6237\u7aef\u5230\u670d\u52a1\u5668\u65b9\u5411\u7684\u8fde\u63a5\u5c31\u5173\u95ed\u4e86<\/strong>\u3002\u5ba2\u6237\u7aef\u4e0d\u4f1a\u518d\u5411\u670d\u52a1\u5668\u53d1\u9001\u6570\u636e\uff0c\u4f46<strong>\u670d\u52a1\u5668\u53ef\u80fd\u8fd8\u6709\u6570\u636e\u8981\u53d1\u9001\u7ed9\u5ba2\u6237\u7aef<\/strong>\uff0c\u8fde\u63a5\u5904\u4e8e<strong>\u534a\u5173\u95ed\u72b6\u6001<\/strong>\u3002<\/li>\n\n\n\n<li><strong>\u670d\u52a1\u5668\u72b6\u6001<\/strong>\uff1a\u4ece\u00a0<code>ESTABLISHED<\/code>\u00a0\u8fdb\u5165\u00a0<code>CLOSE-WAIT<\/code>\uff08\u5173\u95ed\u7b49\u5f85\uff09\u3002<\/li>\n\n\n\n<li><strong>\u5ba2\u6237\u7aef\u72b6\u6001<\/strong>\uff1a\u6536\u5230\u8fd9\u4e2a ACK \u540e\uff0c\u4ece\u00a0<code>FIN-WAIT-1<\/code>\u00a0\u8fdb\u5165\u00a0<code>FIN-WAIT-2<\/code>\uff08\u7ec8\u6b62\u7b49\u5f852\uff09\u3002<\/li>\n<\/ul>\n\n\n\n<p id=\"ufc980e7b\"><strong>\u7b2c\u4e09\u6b65\uff1a\u7b2c\u4e09\u6b21\u6325\u624b\uff08Server -&gt; Client\uff09<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u5f53\u670d\u52a1\u5668\u5c06\u5269\u4f59\u6570\u636e\u5168\u90e8\u53d1\u9001\u5b8c\u6bd5\u540e\uff0c\u5b83\u7684\u5e94\u7528\u7a0b\u5e8f\u4e5f\u4f1a\u8c03\u7528\u00a0<code>close()<\/code>\u00a0\u65b9\u6cd5\uff0c\u53d1\u9001\u4e00\u4e2a FIN \u62a5\u6587\u3002<\/li>\n\n\n\n<li>\u8bbe\u7f6e\u6807\u5fd7\u4f4d\u00a0<strong>FIN = 1<\/strong>\uff08\u901a\u5e38\u8fd8\u4f1a\u540c\u65f6\u8bbe\u7f6e ACK = 1\uff09\u3002<\/li>\n\n\n\n<li>\u643a\u5e26\u4e00\u4e2a\u5e8f\u5217\u53f7\u00a0<code>seq = w<\/code>\u3002<\/li>\n\n\n\n<li><strong>\u670d\u52a1\u5668\u72b6\u6001<\/strong>\uff1a\u4ece\u00a0<code>CLOSE-WAIT<\/code>\u00a0\u8fdb\u5165\u00a0<code>LAST-ACK<\/code>\uff08\u6700\u540e\u786e\u8ba4\uff09\u3002<\/li>\n<\/ul>\n\n\n\n<p id=\"u7522da53\"><strong>\u7b2c\u56db\u6b65\uff1a\u7b2c\u56db\u6b21\u6325\u624b\uff08Client -&gt; Server\uff09<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u5ba2\u6237\u7aef\u6536\u5230\u670d\u52a1\u5668\u7684 FIN \u62a5\u6587\u540e\uff0c\u5fc5\u987b\u53d1\u9001\u4e00\u4e2a\u786e\u8ba4\u62a5\u6587\u3002<\/li>\n\n\n\n<li>\u8bbe\u7f6e\u6807\u5fd7\u4f4d\u00a0<strong>ACK = 1<\/strong>\u3002<\/li>\n\n\n\n<li>\u786e\u8ba4\u53f7\u8bbe\u7f6e\u4e3a\u00a0<code>w + 1<\/code>\u3002<\/li>\n\n\n\n<li><strong>\u5ba2\u6237\u7aef\u72b6\u6001<\/strong>\uff1a\u4ece\u00a0<code>FIN-WAIT-2<\/code>\u00a0\u8fdb\u5165\u00a0<code>TIME-WAIT<\/code>\uff08\u65f6\u95f4\u7b49\u5f85\uff09\u3002\u6b64\u65f6\u5ba2\u6237\u7aef\u8fde\u63a5\u5c1a\u672a\u5b8c\u5168\u5173\u95ed\uff0c\u9700\u8981\u7b49\u5f85\u00a0<strong>2MSL<\/strong>\uff08\u4e24\u500d\u7684\u6700\u5927\u62a5\u6587\u6bb5\u751f\u5b58\u65f6\u95f4\uff09\u65f6\u957f\u3002<\/li>\n\n\n\n<li>\u670d\u52a1\u5668\u6536\u5230\u8fd9\u4e2a ACK \u540e\uff0c\u72b6\u6001\u4ece\u00a0<code>LAST-ACK<\/code>\u00a0\u8fdb\u5165\u00a0<code>CLOSED<\/code>\uff0c\u8fde\u63a5\u6b63\u5f0f\u5173\u95ed\u3002<\/li>\n<\/ul>\n\n\n\n<p id=\"uca4ec0e3\"><strong>\u4e3a\u4ec0\u4e48\u5ba2\u6237\u7aef\u9700\u8981 TIME-WAIT \u72b6\u6001\uff1f\u7b49\u5f85 2MSL \u7684\u76ee\u7684\u662f\u4ec0\u4e48\uff1f<\/strong><\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>\u53ef\u9760\u5730\u7ec8\u6b62\u8fde\u63a5<\/strong>\uff1a\u786e\u4fdd\u5ba2\u6237\u7aef\u53d1\u9001\u7684\u6700\u540e\u4e00\u4e2a ACK \u80fd\u5230\u8fbe\u670d\u52a1\u5668\u3002\u5982\u679c\u8fd9\u4e2a ACK \u4e22\u5931\uff0c\u670d\u52a1\u5668\u4f1a\u8d85\u65f6\u91cd\u4f20 FIN \u62a5\u6587\u3002\u5ba2\u6237\u7aef\u5728\u00a0<code>TIME-WAIT<\/code>\u00a0\u72b6\u6001\u4e0b\u53ef\u4ee5\u6536\u5230\u8fd9\u4e2a\u91cd\u4f20\u7684 FIN\uff0c\u5e76\u91cd\u53d1 ACK\u3002<\/li>\n\n\n\n<li><strong>\u8ba9\u65e7\u7684\u91cd\u590d\u62a5\u6587\u5728\u7f51\u7edc\u4e2d\u6d88\u901d<\/strong>\uff1a\u7b49\u5f85 2MSL \u65f6\u95f4\uff0c\u8db3\u4ee5\u8ba9\u672c\u6b21\u8fde\u63a5\u8fc7\u7a0b\u4e2d\u4ea7\u751f\u7684\u6240\u6709\u62a5\u6587\u90fd\u5728\u7f51\u7edc\u4e2d\u6d88\u5931\u3002\u8fd9\u6837\uff0c\u5c31\u4e0d\u4f1a\u5f71\u54cd\u540e\u7eed\u4f7f\u7528\u76f8\u540c\u56db\u5143\u7ec4\uff08\u6e90IP\u3001\u6e90\u7aef\u53e3\u3001\u76ee\u7684IP\u3001\u76ee\u7684\u7aef\u53e3\uff09\u7684\u65b0\u8fde\u63a5\u3002<\/li>\n<\/ol>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"f0b9c32c\"><a><\/a><strong>\u603b\u7ed3\u4e0e\u5bf9\u6bd4<\/strong><\/h4>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><tbody><tr><td class=\"has-text-align-left\" data-align=\"left\">\u9636\u6bb5<\/td><td class=\"has-text-align-left\" data-align=\"left\">\u76ee\u7684<\/td><td class=\"has-text-align-left\" data-align=\"left\">\u5173\u952e\u6807\u5fd7\u4f4d<\/td><td class=\"has-text-align-left\" data-align=\"left\">\u72b6\u6001\u53d8\u5316<\/td><\/tr><tr><td class=\"has-text-align-left\" data-align=\"left\"><strong>\u4e09\u6b21\u63e1\u624b<\/strong><\/td><td class=\"has-text-align-left\" data-align=\"left\"><strong>\u5efa\u7acb\u8fde\u63a5\uff0c\u540c\u6b65\u521d\u59cb\u5e8f\u5217\u53f7<\/strong><\/td><td class=\"has-text-align-left\" data-align=\"left\">SYN, ACK<\/td><td class=\"has-text-align-left\" data-align=\"left\">CLOSED -&gt; SYN-SENT -&gt; SYN-RCVD -&gt; ESTABLISHED<\/td><\/tr><tr><td class=\"has-text-align-left\" data-align=\"left\"><strong>\u7b2c\u4e00\u6b21\u6325\u624b<\/strong><\/td><td class=\"has-text-align-left\" data-align=\"left\"><strong>\u5ba2\u6237\u7aef\u53d1\u8d77\u5173\u95ed\uff08\u5173\u95ed\u5df1\u65b9\u53d1\u9001\u901a\u9053\uff09<\/strong><\/td><td class=\"has-text-align-left\" data-align=\"left\">FIN<\/td><td class=\"has-text-align-left\" data-align=\"left\">ESTABLISHED -&gt; FIN-WAIT-1<\/td><\/tr><tr><td class=\"has-text-align-left\" data-align=\"left\"><strong>\u7b2c\u4e8c\u6b21\u6325\u624b<\/strong><\/td><td class=\"has-text-align-left\" data-align=\"left\"><strong>\u670d\u52a1\u5668\u786e\u8ba4\u6536\u5230\u5173\u95ed\u8bf7\u6c42<\/strong><\/td><td class=\"has-text-align-left\" data-align=\"left\">ACK<\/td><td class=\"has-text-align-left\" data-align=\"left\">ESTABLISHED -&gt; CLOSE-WAIT \/ FIN-WAIT-1 -&gt; FIN-WAIT-2<\/td><\/tr><tr><td class=\"has-text-align-left\" data-align=\"left\"><strong>\u7b2c\u4e09\u6b21\u6325\u624b<\/strong><\/td><td class=\"has-text-align-left\" data-align=\"left\"><strong>\u670d\u52a1\u5668\u53d1\u8d77\u5173\u95ed\uff08\u5173\u95ed\u5df1\u65b9\u53d1\u9001\u901a\u9053\uff09<\/strong><\/td><td class=\"has-text-align-left\" data-align=\"left\">FIN, ACK<\/td><td class=\"has-text-align-left\" data-align=\"left\">CLOSE-WAIT -&gt; LAST-ACK<\/td><\/tr><tr><td class=\"has-text-align-left\" data-align=\"left\"><strong>\u7b2c\u56db\u6b21\u6325\u624b<\/strong><\/td><td class=\"has-text-align-left\" data-align=\"left\"><strong>\u5ba2\u6237\u7aef\u786e\u8ba4\u6536\u5230\u5173\u95ed\u8bf7\u6c42<\/strong><\/td><td class=\"has-text-align-left\" data-align=\"left\">ACK<\/td><td class=\"has-text-align-left\" data-align=\"left\">FIN-WAIT-2 -&gt; TIME-WAIT -&gt; CLOSED<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"FDVTV\"><a><\/a>\u9762\u8bd5\u56de\u7b54<\/h4>\n\n\n\n<p id=\"ud91637bb\"><strong>\u4e09\u6b21\u63e1\u624b\uff08\u5efa\u7acb\u8fde\u63a5\uff09<\/strong><\/p>\n\n\n\n<p id=\"u4dde25bf\">\u76ee\u7684\uff1a\u4e3a\u4e86\u786e\u8ba4<strong>\u53cc\u65b9\u7684\u53d1\u9001\u548c\u63a5\u6536\u80fd\u529b\u90fd\u6b63\u5e38<\/strong>\uff0c\u5e76\u540c\u6b65\u521d\u59cb\u5e8f\u5217\u53f7\uff08ISN\uff09\u3002<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>\u7b2c\u4e00\u6b21\u63e1\u624b\uff08SYN\uff09<\/strong>\uff1a\u5ba2\u6237\u7aef\u53d1\u9001\u4e00\u4e2a\u00a0<code>SYN<\/code>\u7684\u5305\uff0c\u5e76\u968f\u673a\u751f\u6210\u4e00\u4e2a\u521d\u59cb\u5e8f\u5217\u53f7\u00a0<code>X<\/code>\u00a0\u7ed9\u670d\u52a1\u5668\u3002\u610f\u601d\u662f\uff1a\u201c\u6211\u60f3\u5efa\u7acb\u8fde\u63a5\uff0c\u8fd9\u662f\u6211\u7684\u8d77\u59cb\u53f7\u3002\u201d<\/li>\n\n\n\n<li><strong>\u7b2c\u4e8c\u6b21\u63e1\u624b\uff08SYN+ACK\uff09<\/strong>\uff1a\u670d\u52a1\u5668\u6536\u5230\u540e\uff0c\u5982\u679c\u540c\u610f\u8fde\u63a5\uff0c\u4f1a\u56de\u590d\u4e00\u4e2a\u00a0<code>SYN<\/code>\u00a0\u548c\u00a0<code>ACK<\/code>\u7684\u5305\u3002\u5b83\u4f1a\u786e\u8ba4\u5ba2\u6237\u7aef\u7684\u5e8f\u5217\u53f7\uff0c\u540c\u65f6\u81ea\u5df1\u4e5f\u968f\u673a\u751f\u6210\u4e00\u4e2a\u521d\u59cb\u5e8f\u5217\u53f7\u00a0<code>Y<\/code>\u3002\u610f\u601d\u662f\uff1a\u201c\u6211\u6536\u5230\u4f60\u7684\u8bf7\u6c42\u4e86\uff0c\u6211\u540c\u610f\u8fde\u63a5\u3002\u8fd9\u662f\u6211\u7684\u8d77\u59cb\u53f7\u3002\u201d<\/li>\n\n\n\n<li><strong>\u7b2c\u4e09\u6b21\u63e1\u624b\uff08ACK\uff09<\/strong>\uff1a\u5ba2\u6237\u7aef\u6536\u5230\u56de\u590d\u540e\uff0c\u518d\u5411\u670d\u52a1\u5668\u53d1\u9001\u4e00\u4e2a\u00a0<code>ACK<\/code>\u00a0\u7684\u5305\uff0c\u786e\u8ba4\u670d\u52a1\u5668\u7684\u5e8f\u5217\u53f7\u3002\u610f\u601d\u662f\uff1a\u201c\u6536\u5230\u4f60\u7684\u540c\u610f\u4e86\uff0c\u8fde\u63a5\u5efa\u7acb\u6210\u529f\u3002\u201d<br><strong>\u81f3\u6b64\uff0c\u8fde\u63a5\u5efa\u7acb\uff0c\u53ef\u4ee5\u5f00\u59cb\u6570\u636e\u4f20\u8f93\u3002<\/strong><\/li>\n<\/ol>\n\n\n\n<p id=\"u2003e83f\"><strong>\u56db\u6b21\u6325\u624b\uff08\u65ad\u5f00\u8fde\u63a5\uff09<\/strong><\/p>\n\n\n\n<p id=\"u3d2dc7cc\">\u76ee\u7684\uff1a\u53cc\u65b9\u90fd\u786e\u8ba4\u6570\u636e\u5df2\u53d1\u9001\u5b8c\u6bd5\uff0c\u53ef\u4ee5\u5b89\u5168\u5173\u95ed\u8fde\u63a5\u3002\u4e4b\u6240\u4ee5\u662f\u56db\u6b21\uff0c\u56e0\u4e3aTCP\u8fde\u63a5\u662f<strong>\u5168\u53cc\u5de5<\/strong>\u7684\uff0c\u6bcf\u4e00\u65b9\u5411\u90fd\u9700\u8981\u72ec\u7acb\u5173\u95ed\u3002<\/p>\n\n\n\n<ol 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