{"id":479,"date":"2015-12-02T10:41:17","date_gmt":"2015-12-02T10:41:17","guid":{"rendered":"d18f655c3fce66ca401d5f38b48c89af"},"modified":"2015-12-02T10:41:17","modified_gmt":"2015-12-02T10:41:17","slug":"","status":"publish","type":"post","link":"https:\/\/www.xiaobo.li\/notes\/archives\/479","title":{"rendered":"LISTENING,ESTABLISHED,TIME_WAIT,CLOSE_WAIT"},"content":{"rendered":"

TCP\u534f\u8bae\u89c4\u5b9a\uff0c\u5bf9\u4e8e\u5df2\u7ecf\u5efa\u7acb\u7684\u8fde\u63a5\uff0c\u7f51\u7edc\u53cc\u65b9\u8981\u8fdb\u884c\u56db\u6b21\u63e1\u624b\u624d\u80fd\u6210\u529f\u65ad\u5f00\u8fde\u63a5\uff0c\u5982\u679c\u7f3a\u5c11\u4e86\u5176\u4e2d\u67d0\u4e2a\u6b65\u9aa4\uff0c\u5c06\u4f1a\u4f7f\u8fde\u63a5\u5904\u4e8e\u5047\u6b7b\u72b6\u6001\uff0c\u8fde\u63a5\u672c\u8eab\u5360\u7528\u7684\u8d44\u6e90\u4e0d
\n\u4f1a\u88ab\u91ca\u653e\u3002\u7f51\u7edc\u670d\u52a1\u5668\u7a0b\u5e8f\u8981\u540c\u65f6\u7ba1\u7406\u5927\u91cf\u8fde\u63a5\uff0c\u6240\u4ee5\u5f88\u6709\u5fc5\u8981\u4fdd\u8bc1\u65e0\u7528\u8fde\u63a5\u5b8c\u5168\u65ad\u5f00\uff0c\u5426\u5219\u5927\u91cf\u50f5\u6b7b\u7684\u8fde\u63a5\u4f1a\u6d6a\u8d39\u8bb8\u591a\u670d\u52a1\u5668\u8d44\u6e90\u3002\u5728\u4f17\u591aTCP\u72b6\u6001\u4e2d\uff0c\u6700\u503c\u5f97
\n\u6ce8\u610f\u7684\u72b6\u6001\u6709\u4e24\u4e2a\uff1aCLOSE_WAIT\u548cTIME_WAIT\u3002 
\n 
\n1\u3001LISTENING\u72b6\u6001
\n\u3000\u3000FTP\u670d\u52a1\u542f\u52a8\u540e\u9996\u5148\u5904\u4e8e\u4fa6\u542c\uff08LISTENING\uff09\u72b6\u6001\u3002<\/p>\n

2\u3001ESTABLISHED\u72b6\u6001
\n\u3000\u3000ESTABLISHED\u7684\u610f\u601d\u662f\u5efa\u7acb\u8fde\u63a5\u3002\u8868\u793a\u4e24\u53f0\u673a\u5668\u6b63\u5728\u901a\u4fe1\u3002<\/p>\n

3\u3001CLOSE_WAIT<\/span><\/p>\n

    \u5bf9\u65b9\u4e3b\u52a8\u5173\u95ed\u8fde\u63a5\u6216\u8005\u7f51\u7edc\u5f02\u5e38\u5bfc\u81f4\u8fde\u63a5\u4e2d\u65ad\uff0c\u8fd9\u65f6\u6211\u65b9\u7684\u72b6\u6001\u4f1a\u53d8\u6210CLOSE_WAIT \u6b64\u65f6\u6211\u65b9\u8981\u8c03\u7528close()\u6765\u4f7f\u5f97\u8fde\u63a5\u6b63\u786e\u5173\u95ed<\/p>\n

4\u3001TIME_WAIT<\/span><\/p>\n

   
\n\u6211\u65b9\u4e3b\u52a8\u8c03\u7528close()\u65ad\u5f00\u8fde\u63a5\uff0c\u6536\u5230\u5bf9\u65b9\u786e\u8ba4\u540e\u72b6\u6001\u53d8\u4e3aTIME_WAIT\u3002TCP\u534f\u8bae\u89c4\u5b9aTIME_WAIT\u72b6\u6001\u4f1a\u4e00\u76f4\u6301\u7eed2MSL(\u5373\u4e24\u500d\u7684\u5206
\n\u6bb5\u6700\u5927\u751f\u5b58\u671f)\uff0c\u4ee5\u6b64\u6765\u786e\u4fdd\u65e7\u7684\u8fde\u63a5\u72b6\u6001\u4e0d\u4f1a\u5bf9\u65b0\u8fde\u63a5\u4ea7\u751f\u5f71\u54cd\u3002\u5904\u4e8eTIME_WAIT\u72b6\u6001\u7684\u8fde\u63a5\u5360\u7528\u7684\u8d44\u6e90\u4e0d\u4f1a\u88ab\u5185\u6838\u91ca\u653e\uff0c\u6240\u4ee5\u4f5c\u4e3a\u670d\u52a1\u5668\uff0c\u5728\u53ef\u80fd\u7684\u60c5
\n\u51b5\u4e0b\uff0c\u5c3d\u91cf\u4e0d\u8981\u4e3b\u52a8\u65ad\u5f00\u8fde\u63a5\uff0c\u4ee5\u51cf\u5c11TIME_WAIT\u72b6\u6001\u9020\u6210\u7684\u8d44\u6e90\u6d6a\u8d39\u3002 <\/p>\n

    \u76ee\u524d\u6709\u4e00\u79cd\u907f\u514dTIME_WAIT\u8d44\u6e90\u6d6a\u8d39\u7684\u65b9\u6cd5\uff0c\u5c31\u662f\u5173\u95edsocket\u7684LINGER\u9009\u9879\u3002\u4f46\u8fd9\u79cd\u505a\u6cd5\u662fTCP\u534f\u8bae\u4e0d\u63a8\u8350\u4f7f\u7528\u7684\uff0c\u5728\u67d0\u4e9b\u60c5\u51b5\u4e0b\u8fd9\u4e2a\u64cd\u4f5c\u53ef\u80fd\u4f1a\u5e26\u6765\u9519\u8bef\u3002 <\/p>\n

 <\/p>\n

\u6765\u6e90\uff1ahttp:\/\/www.cppblog.com\/prayer\/archive\/2009\/04\/01\/78592.html<\/p>\n

 <\/p>\n

 <\/p>\n

\u5e38\u7528\u7684\u4e09\u4e2a\u72b6\u6001\u662f\uff1aESTABLISHED \u8868\u793a\u6b63\u5728\u901a\u4fe1\uff0cTIME_WAIT \u8868\u793a\u4e3b\u52a8\u5173\u95ed\uff0cCLOSE_WAIT \u8868\u793a\u88ab\u52a8\u5173\u95ed\u3002<\/p>\n

TCP\u534f\u8bae\u89c4\u5b9a\uff0c\u5bf9\u4e8e\u5df2\u7ecf\u5efa\u7acb\u7684\u8fde\u63a5\uff0c
\n\u7f51\u7edc\u53cc\u65b9\u8981\u8fdb\u884c\u56db\u6b21\u63e1\u624b\u624d\u80fd\u6210\u529f\u65ad\u5f00\u8fde\u63a5\uff0c\u5982\u679c\u7f3a\u5c11\u4e86\u5176\u4e2d\u67d0\u4e2a\u6b65\u9aa4\uff0c\u5c06\u4f1a\u4f7f\u8fde\u63a5\u5904\u4e8e\u5047\u6b7b\u72b6\u6001\uff0c\u8fde\u63a5\u672c\u8eab\u5360\u7528\u7684\u8d44\u6e90\u4e0d\u4f1a\u88ab\u91ca\u653e\u3002\u7f51\u7edc\u670d\u52a1\u5668\u7a0b\u5e8f\u8981\u540c\u65f6\u7ba1\u7406\u5927
\n\u91cf\u8fde\u63a5\uff0c\u6240\u4ee5\u5f88\u6709\u5fc5\u8981\u4fdd\u8bc1\u65e0\u7528\u8fde\u63a5\u5b8c\u5168\u65ad\u5f00\uff0c\u5426\u5219\u5927\u91cf\u50f5\u6b7b\u7684\u8fde\u63a5\u4f1a\u6d6a\u8d39\u8bb8\u591a\u670d\u52a1\u5668\u8d44\u6e90\u3002\u5728\u4f17\u591aTCP\u72b6\u6001\u4e2d\uff0c\u6700\u503c\u5f97\u6ce8\u610f\u7684\u72b6\u6001\u6709\u4e24
\n\u4e2a\uff1aCLOSE_WAIT\u548cTIME_WAIT\u3002  <\/span><\/p>\n

TIME_WAIT <\/strong><\/p>\n

TIME_WAIT \u662f\u4e3b\u52a8\u5173\u95ed\u94fe\u63a5\u65f6\u5f62\u6210\u7684\uff0c\u7b49\u5f852MSL\u65f6\u95f4\uff0c\u7ea64\u5206\u949f\u3002<\/span>\u4e3b\u8981\u662f\u9632\u6b62\u6700\u540e\u4e00\u4e2aACK\u4e22\u5931\u3002  \u7531\u4e8eTIME_WAIT \u7684\u65f6\u95f4\u4f1a\u975e\u5e38\u957f\uff0c\u56e0\u6b64server\u7aef\u5e94\u5c3d\u91cf\u51cf\u5c11\u4e3b\u52a8\u5173\u95ed\u8fde\u63a5<\/span><\/p>\n

CLOSE_WAIT<\/strong>
\nCLOSE_WAIT\u662f\u88ab\u52a8\u5173\u95ed\u8fde\u63a5\u662f\u5f62\u6210\u7684\u3002\u6839\u636eTCP\u72b6\u6001\u673a\uff0c\u670d\u52a1\u5668\u7aef\u6536\u5230\u5ba2\u6237\u7aef\u53d1\u9001\u7684FIN\uff0c\u5219\u6309\u7167TCP\u5b9e\u73b0\u53d1\u9001ACK\uff0c\u56e0\u6b64\u8fdb\u5165
\nCLOSE_WAIT\u72b6\u6001\u3002\u4f46\u5982\u679c\u670d\u52a1\u5668\u7aef\u4e0d\u6267\u884cclose()\uff0c\u5c31\u4e0d\u80fd\u7531CLOSE_WAIT\u8fc1\u79fb\u5230LAST_ACK\uff0c\u5219\u7cfb\u7edf\u4e2d\u4f1a\u5b58\u5728\u5f88\u591a
\nCLOSE_WAIT\u72b6\u6001\u7684\u8fde\u63a5\u3002\u6b64\u65f6\uff0c\u53ef\u80fd\u662f\u7cfb\u7edf\u5fd9\u4e8e\u5904\u7406\u8bfb\u3001\u5199\u64cd\u4f5c\uff0c\u800c\u672a\u5c06\u5df2\u6536\u5230FIN\u7684\u8fde\u63a5\uff0c\u8fdb\u884cclose\u3002\u6b64\u65f6\uff0crecv\/read\u5df2\u6536\u5230
\nFIN\u7684\u8fde\u63a5socket\uff0c\u4f1a\u8fd4\u56de0\u3002<\/p>\n

\u4e3a\u4ec0\u4e48\u9700\u8981 TIME_WAIT \u72b6\u6001\uff1f<\/strong>
\n\u5047\u8bbe\u6700\u7ec8\u7684ACK\u4e22\u5931\uff0cserver\u5c06\u91cd\u53d1FIN\uff0cclient\u5fc5\u987b\u7ef4\u62a4TCP\u72b6\u6001\u4fe1\u606f\u4ee5\u4fbf\u53ef\u4ee5\u91cd\u53d1\u6700\u7ec8\u7684ACK\uff0c\u5426\u5219\u4f1a\u53d1\u9001RST\uff0c\u7ed3\u679cserver\u8ba4
\n\u4e3a\u53d1\u751f\u9519\u8bef\u3002TCP\u5b9e\u73b0\u5fc5\u987b\u53ef\u9760\u5730\u7ec8\u6b62\u8fde\u63a5\u7684\u4e24\u4e2a\u65b9\u5411(\u5168\u53cc\u5de5\u5173\u95ed)\uff0cclient\u5fc5\u987b\u8fdb\u5165 TIME_WAIT
\n\u72b6\u6001\uff0c\u56e0\u4e3aclient\u53ef\u80fd\u9762 \u4e34\u91cd\u53d1\u6700\u7ec8ACK\u7684\u60c5\u5f62\u3002<\/p>\n

\u4e3a\u4ec0\u4e48 TIME_WAIT \u72b6\u6001\u9700\u8981\u4fdd\u6301 2MSL \u8fd9\u4e48\u957f\u7684\u65f6\u95f4\uff1f<\/strong>
\n\u5982\u679c TIME_WAIT
\n\u72b6\u6001\u4fdd\u6301\u65f6\u95f4\u4e0d\u8db3\u591f\u957f(\u6bd4\u5982\u5c0f\u4e8e2MSL)\uff0c\u7b2c\u4e00\u4e2a\u8fde\u63a5\u5c31\u6b63\u5e38\u7ec8\u6b62\u4e86\u3002\u7b2c\u4e8c\u4e2a\u62e5\u6709\u76f8\u540c\u76f8\u5173\u4e94\u5143\u7ec4\u7684\u8fde\u63a5\u51fa\u73b0\uff0c\u800c\u7b2c\u4e00\u4e2a\u8fde\u63a5\u7684\u91cd\u590d\u62a5\u6587\u5230\u8fbe\uff0c\u5e72\u6270\u4e86\u7b2c\u4e8c\u4e2a\u8fde
\n\u63a5\u3002TCP\u5b9e\u73b0\u5fc5\u987b\u9632\u6b62\u67d0\u4e2a\u8fde\u63a5\u7684\u91cd\u590d\u62a5\u6587\u5728\u8fde\u63a5\u7ec8\u6b62\u540e\u51fa\u73b0\uff0c\u6240\u4ee5\u8ba9TIME_WAIT\u72b6\u6001\u4fdd\u6301\u65f6\u95f4\u8db3\u591f\u957f(2MSL)\uff0c\u8fde\u63a5\u76f8\u5e94\u65b9\u5411\u4e0a\u7684TCP\u62a5\u6587\u8981\u4e48
\n\u5b8c\u5168\u54cd\u5e94\u5b8c\u6bd5\uff0c\u8981\u4e48\u88ab \u4e22\u5f03\u3002\u5efa\u7acb\u7b2c\u4e8c\u4e2a\u8fde\u63a5\u7684\u65f6\u5019\uff0c\u4e0d\u4f1a\u6df7\u6dc6\u3002<\/p>\n

 TIME_WAIT \u548cCLOSE_WAIT<\/strong>\u72b6\u6001socket\u8fc7\u591a<\/span><\/p>\n

\u5982\u679c\u670d\u52a1\u5668\u51fa\u4e86\u5f02\u5e38\uff0c\u767e\u5206\u4e4b\u516b\u4e5d\u5341\u90fd\u662f\u4e0b\u9762\u4e24\u79cd\u60c5\u51b5\uff1a<\/p>\n

1.\u670d\u52a1\u5668\u4fdd\u6301\u4e86\u5927\u91cfTIME_WAIT\u72b6\u6001<\/p>\n

2.\u670d\u52a1\u5668\u4fdd\u6301\u4e86\u5927\u91cfCLOSE_WAIT\u72b6\u6001\uff0c\u7b80\u5355\u6765\u8bf4CLOSE_WAIT\u6570\u76ee\u8fc7\u5927\u662f\u7531\u4e8e\u88ab\u52a8\u5173\u95ed\u8fde\u63a5\u5904\u7406\u4e0d\u5f53\u5bfc\u81f4\u7684\u3002<\/p>\n

\n\u56e0\u4e3alinux\u5206\u914d\u7ed9\u4e00\u4e2a\u7528\u6237\u7684\u6587\u4ef6\u53e5\u67c4\u662f\u6709\u9650\u7684\uff0c\u800cTIME_WAIT\u548cCLOSE_WAIT\u4e24\u79cd\u72b6\u6001\u5982\u679c\u4e00\u76f4\u88ab\u4fdd\u6301\uff0c\u90a3\u4e48\u610f\u5473\u7740\u5bf9\u5e94\u6570\u76ee\u7684\u901a\u9053\u5c31\u4e00\u76f4
\n\u88ab\u5360\u7740\uff0c\u800c\u4e14\u662f\u201c\u5360\u7740\u8305\u5751\u4e0d\u4f7f\u52b2\u201d\uff0c\u4e00\u65e6\u8fbe\u5230\u53e5\u67c4\u6570\u4e0a\u9650\uff0c\u65b0\u7684\u8bf7\u6c42\u5c31\u65e0\u6cd5\u88ab\u5904\u7406\u4e86\uff0c\u63a5\u7740\u5c31\u662f\u5927\u91cfToo Many Open Files\u5f02\u5e38<\/p>\n

 <\/p>\n

\u6765\u6e90\uff1ahttp:\/\/blog.csdn.net\/kobejayandy\/article\/details\/17655739<\/p>\n","protected":false},"excerpt":{"rendered":"

TCP\u534f\u8bae\u89c4\u5b9a\uff0c\u5bf9\u4e8e\u5df2\u7ecf\u5efa\u7acb\u7684\u8fde\u63a5\uff0c\u7f51\u7edc\u53cc\u65b9\u8981\u8fdb\u884c\u56db\u6b21\u63e1\u624b\u624d\u80fd\u6210\u529f\u65ad\u5f00\u8fde\u63a5\uff0c\u5982\u679c\u7f3a\u5c11\u4e86\u5176\u4e2d\u67d0\u4e2a\u6b65\u9aa4\uff0c\u5c06\u4f1a\u4f7f\u8fde\u63a5\u5904\u4e8e\u5047\u6b7b\u72b6\u6001\uff0c\u8fde\u63a5\u672c\u8eab\u5360\u7528\u7684\u8d44\u6e90\u4e0d
\n\u4f1a\u88ab\u91ca\u653e\u3002\u7f51\u7edc\u670d\u52a1\u5668\u7a0b\u5e8f\u8981\u540c\u65f6\u7ba1\u7406\u5927\u91cf\u8fde\u63a5\uff0c\u6240\u4ee5\u5f88\u6709\u5fc5\u8981\u4fdd\u8bc1\u65e0\u7528\u8fde\u63a5\u5b8c\u5168\u65ad\u5f00\uff0c\u5426\u5219\u5927\u91cf\u50f5\u6b7b\u7684\u8fde\u63a5\u4f1a\u6d6a\u8d39\u8bb8\u591a\u670d\u52a1\u5668\u8d44\u6e90\u3002\u5728\u4f17\u591aTCP\u72b6\u6001\u4e2d\uff0c\u6700\u503c\u5f97
\n\u6ce8\u610f\u7684\u72b6\u6001\u6709\u4e24\u4e2a\uff1aCLOSE_WAIT\u548cTIME_WAIT\u3002 
\n 
\n1\u3001LISTENING\u72b6\u6001
\n\u3000\u3000FTP\u670d\u52a1\u542f\u52a8\u540e\u9996\u5148\u5904\u4e8e\u4fa6\u542c\uff08LISTENING\uff09\u72b6\u6001\u3002<\/p>\n

2\u3001ESTABLISHED\u72b6\u6001
\n\u3000\u3000ESTABLISHED\u7684\u610f\u601d\u662f\u5efa\u7acb\u8fde\u63a5\u3002\u8868\u793a\u4e24\u53f0\u673a\u5668\u6b63\u5728\u901a\u4fe1\u3002<\/p>\n

3\u3001CLOSE_WA...<\/span><\/p>\n

\u7ee7\u7eed\u9605\u8bfb →<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[291],"tags":[],"class_list":["post-479","post","type-post","status-publish","format-standard","hentry","category-network"],"_links":{"self":[{"href":"https:\/\/www.xiaobo.li\/notes\/wp-json\/wp\/v2\/posts\/479","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.xiaobo.li\/notes\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.xiaobo.li\/notes\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.xiaobo.li\/notes\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.xiaobo.li\/notes\/wp-json\/wp\/v2\/comments?post=479"}],"version-history":[{"count":0,"href":"https:\/\/www.xiaobo.li\/notes\/wp-json\/wp\/v2\/posts\/479\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.xiaobo.li\/notes\/wp-json\/wp\/v2\/media?parent=479"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.xiaobo.li\/notes\/wp-json\/wp\/v2\/categories?post=479"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.xiaobo.li\/notes\/wp-json\/wp\/v2\/tags?post=479"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}