{"id":435791,"date":"2021-04-18T17:05:24","date_gmt":"2021-04-18T09:05:24","guid":{"rendered":"http:\/\/4563.org\/?p=435791"},"modified":"2021-04-18T17:05:24","modified_gmt":"2021-04-18T09:05:24","slug":"tcp-%e5%8d%8f%e8%ae%ae%e4%b8%ad%e7%9a%84-ack-%e5%ba%94%e8%af%a5%e6%80%8e%e4%b9%88%e7%90%86%e8%a7%a3%ef%bc%8c%e6%95%b0%e6%8d%ae%e5%8c%85%e5%a6%82%e6%9e%9c%e5%9c%a8%e4%bc%a0%e8%be%93%e8%bf%87%e7%a8%8b","status":"publish","type":"post","link":"http:\/\/4563.org\/?p=435791","title":{"rendered":"TCP \u534f\u8bae\u4e2d\u7684 ACK \u5e94\u8be5\u600e\u4e48\u7406\u89e3\uff0c\u6570\u636e\u5305\u5982\u679c\u5728\u4f20\u8f93\u8fc7\u7a0b\u4e2d\u4e22\u5931\uff0c\u53cc\u65b9\u90fd\u4f1a\u5f97\u5230\u54cd\u5e94\u5417\uff1f"},"content":{"rendered":"
\n
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\n

TCP \u534f\u8bae\u4e2d\u7684 ACK \u5e94\u8be5\u600e\u4e48\u7406\u89e3\uff0c\u6570\u636e\u5305\u5982\u679c\u5728\u4f20\u8f93\u8fc7\u7a0b\u4e2d\u4e22\u5931\uff0c\u53cc\u65b9\u90fd\u4f1a\u5f97\u5230\u54cd\u5e94\u5417\uff1f <\/h1>\n

<\/p>\n

\n
\u8cc7\u6df1\u5927\u4f6c : LeeReamond <\/span> <\/i> 6<\/span> <\/div>\n
<\/div>\n<\/p><\/div>\n<\/p><\/div>\n<\/p><\/div>\n
<\/p>\n

\u5982\u9898\uff0c\u7406\u8bba\u4e0a\u6765\u8bf4\u5728\u5efa\u7acb TCP \u8fde\u63a5\u4e4b\u540e\uff0c\u5982\u679c\u5ba2\u6237\u7aef\u6536\u5230\u4e1c\u897f\u5e94\u8be5\u6709 ACK \u56de\u6587\uff0c\u8fd9\u6837\u5ba2\u6237\u7aef\u5c31\u53ef\u4ee5\u5b89\u5168\u5730\u91ca\u653e\u8d44\u6e90\uff0c\u4e0d\u7528\u62c5\u5fc3\u91cd\u53d1\u95ee\u9898\u3002<\/p>\n

\u4eca\u5929\u8003\u8651\u5230\u4e00\u79cd\u60c5\u51b5\u662f\uff0c\u5047\u8bbe\u5efa\u7acb TCP \u8fde\u63a5\u540e\uff0c\u5ba2\u6237\u7aef\u53d1\u51fa\u6d88\u606f\uff0c\u4f46\u662f\u59cb\u7ec8\u7b49\u4e0d\u5230 ACK\uff0c\u8fd9\u79cd\u65f6\u5019\u5ba2\u6237\u7aef\u7684\u884c\u4e3a\u662f\u4ec0\u4e48\uff0c\u5982\u679c\u8d85\u65f6\u91cd\u4f20\u7684\u8bdd\uff0c\u6211\u770b\u7f51\u4e0a\u8d44\u6599\u8bf4\u8d85\u65f6\u65f6\u95f4\u901a\u5e38\u5728\u51e0\u767e\u6beb\u79d2\uff0c\u662f\u5426\u610f\u5473\u7740\u5ba2\u6237\u7aef\u53ef\u4ee5\u5728\u4e22\u5305\u7684\u51e0\u767e\u6beb\u79d2\u5185\u786e\u8ba4\u8fde\u63a5\u5df2\u7ecf\u4e2d\u65ad\uff1f\u4f46\u662f\u8fd9\u91cc\u6709\u4e00\u4e2a\u7591\u60d1\uff0c\u6bd5\u7adf\u7f51\u7edc\u73af\u5883\u5f88\u590d\u6742\uff0c\u4ee5\u524d\u7ecf\u5e38\u6709\u5355\u7a0b\u9700\u8981\u51e0\u5343\u6beb\u79d2\u7684\u901a\u4fe1\uff0c\u8fd9\u79cd\u60c5\u51b5\u4e0b\u5ba2\u6237\u7aef\u548c\u670d\u52a1\u5668\u53c8\u662f\u600e\u4e48\u77e5\u9053\u5bf9\u65b9\u7684\u60c5\u51b5\u7684\u5462\u3002<\/p>\n

\u5e94\u7528\u5c42\u4e0a\u7684\u9700\u6c42\u662f\uff0c\u6211\u60f3\u77e5\u9053\u5728\u5efa\u7acb\u4e09\u6b21\u8fde\u63a5\u540e\uff0c\u5982\u679c\u5e94\u7528\u5c42\u7684\u5ba2\u6237\u7aef\u548c\u670d\u52a1\u7aef\u60f3\u8981\u8fdb\u884c\u4e00\u6b21\u53ef\u9760\u7684\u4ea4\u6362\u6570\u636e\uff0c\u662f\u5426\u4ecd\u8981\u4ee5\u4e09\u6b21\u63e1\u624b\u7684\u65b9\u5f0f\u786e\u8ba4\uff0c\u624d\u80fd\u4fdd\u8bc1\u53ef\u9760\uff1f\u800c\u4e0d\u80fd\u505a\u4e00\u4e2a\u6bd4\u5982\u5ba2\u6237\u7aef\u53d1\u51fa 0.5 \u79d2\u5185\u65e0\u65ad\u8fde\u5219\u9ed8\u8ba4\u53d1\u9001\u5df2\u7ecf\u6210\u529f\u8fd9\u79cd\u7684\u903b\u8f91\uff1f<\/p>\n

====<\/p>\n

\u4e0a\u8ff0\u95ee\u9898\u5728 tls \u73af\u5883\u4e2d\u7ed3\u8bba\u6709\u6539\u53d8\u5417\uff1f<\/p>\n<\/p><\/div>\n

\u5927\u4f6c\u6709\u8a71\u8aaa<\/b> (9<\/span>) <\/div>\n
<\/div>\n<\/p><\/div>\n<\/p><\/div>\n
    \n
  • \n
    \n
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    \u8cc7\u6df1\u5927\u4f6c : toaruScar <\/span> <\/div>\n
    <\/i> <\/span> <\/div>\n<\/p><\/div>\n
    TCP \u7684 retransmission \u662f\u57fa\u4e8e RTO \uff08 retransmission timeout \uff09\u7684\uff0cRTO \u53c8\u662f\u7531 RTT \uff08 round trip time \uff09\u8ba1\u7b97\u51fa\u6765\u7684\uff0c\u6240\u4ee5\u5982\u679c\u6709\u201c\u5355\u7a0b\u9700\u8981\u51e0\u5343\u6beb\u79d2\u7684\u901a\u4fe1\u201d\uff0c\u90a3\u4e48 RTT \u5c31\u4f1a\u5f88\u9ad8\uff0c\u5bfc\u81f4 RTO \u4e5f\u4f1a\u5f88\u9ad8\uff0c\u4f7f\u5f97\u53d1\u9001\u65b9\u4e0d\u4f1a\u9a6c\u4e0a retransmission \u3002 <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
    \u4e3b<\/span> \u8cc7\u6df1\u5927\u4f6c : LeeReamond <\/span> <\/div>\n
    <\/i> <\/span> <\/div>\n<\/p><\/div>\n
    @toaruScar \u611f\u8c22\u56de\u590d\uff0c\u53e6\u5916\u60f3\u5230\u4e00\u4e2a\u95ee\u9898\u662f\uff0ctcp \u8981\u56db\u6b21\u5206\u624b\uff0c\u53ef\u9760\u5730\u6ce8\u9500\u6389\u53cc\u65b9\u673a\u5668\u4e0a\u5f00\u8f9f\u51fa\u7684\u8d44\u6e90\uff0c\u90a3\u5982\u679c\u4e00\u65b9\u5b8c\u5168\u6ca1\u6709\u56de\u590d\uff0c\u53d1\u51fa\u53bb\u7684\u5305\u5168\u90fd\u77f3\u6c89\u5927\u6d77\u4e86\uff0c\u4e5f\u5c31\u6ca1\u529e\u6cd5\u56db\u6b21\u5206\u624b\uff0c\u8fd9\u79cd\u60c5\u51b5\u4e0b\u53e6\u4e00\u65b9\u4f1a\u76f4\u63a5\u91ca\u653e\u8d44\u6e90\u5417\uff0c\u8fd9\u662f\u5426\u610f\u5473\u7740\u4e0d\u53ef\u9760 <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
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    \u8cc7\u6df1\u5927\u4f6c : delpo <\/span> <\/div>\n
    <\/i> <\/span> <\/div>\n<\/p><\/div>\n
    @LeeReamond linux \u4e0b\u6700\u540e\u4e00\u6b21\u5206\u624b\u5305\u53d1\u51fa\u540e\u4f1a\u8fdb\u5165 time_wait \u72b6\u6001,\u5c31\u662f\u4e3a\u4e86\u9632\u6b62\u6570\u636e\u5305\u4e22\u5931,\u6240\u4ee5\u8981\u7b49\u5f85\u4e00\u6bb5\u65f6\u95f4\u770b\u6709\u6ca1\u6709\u518d\u6536\u5230 retransmission \u7684\u5305 <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
    \u8cc7\u6df1\u5927\u4f6c : delpo <\/span> <\/div>\n
    <\/i> <\/span> <\/div>\n<\/p><\/div>\n
    @delpo \u5982\u679c\u4f60\u6307\u7684\u662f\u5efa\u7acb\u8fde\u63a5\u540e\u76f4\u63a5\u5c31\u6536\u4e0d\u5230\u6d88\u606f\u4e86,\u90a3\u53d1\u9001\u65b9\u4f1a\u6839\u636e\u4e8c\u8fdb\u5236\u6307\u6570\u9000\u907f\u7b97\u6cd5\u4e00\u76f4\u53d1\u9001 retransmission \u76f4\u5230\u8d85\u8fc7\u8bbe\u7f6e\u7684\u6b21\u6570,\u7136\u540e\u65ad\u5f00\u8fde\u63a5 <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
    \u4e3b<\/span> \u8cc7\u6df1\u5927\u4f6c : LeeReamond <\/span> <\/div>\n
    <\/i> <\/span> <\/div>\n<\/p><\/div>\n
    @delpo \u6240\u4ee5\u5982\u679c\u6211\u6ca1\u7406\u89e3\u9519\u7684\u8bdd\uff0c\u4f60\u7684\u610f\u601d\u662f\u65ad\u5f00\u8fde\u63a5\u540e\u7cfb\u7edf\u8d44\u6e90\u5e76\u4e0d\u7acb\u5373\u91ca\u653e\uff0c\u9ed8\u8ba4\u8bbe\u7f6e\u8981\u4e00\u5206\u949f\u4ee5\u540e\u624d\u80fd\u91ca\u653e\uff1f\u53e6\u5916 timewait \u7684\u72b6\u6001\u4e0b\u7aef\u53e3\u53ef\u4ee5\u7ed1\u5b9a\u65b0\u7684 socket\uff0c\u8fd9\u4e2a\u6211\u89c9\u5f97\u4e5f\u5f88\u77db\u76fe <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
    \u8cc7\u6df1\u5927\u4f6c : delpo <\/span> <\/div>\n
    <\/i> <\/span> <\/div>\n<\/p><\/div>\n
    @LeeReamond \u662f\u7684,\u6240\u4ee5\u8fd9\u4e5f\u662f\u9ad8\u8fde\u63a5\u6570\u5f62\u51b5\u4e0b\u4e3a\u4ec0\u4e48\u8981\u51cf\u5c11 time_wait \u72b6\u6001\u7684\u539f\u56e0,\u5426\u5219\u7cfb\u7edf\u8d44\u6e90\u5c31\u4f1a\u88ab\u8017\u5c3d.<\/p>\n

    \u4e8b\u5b9e\u4e0a\u4e0d\u8bba\u4ec0\u4e48\u72b6\u6001\u90fd\u53ef\u4ee5\u7ed1\u5b9a\u65b0 socket,\u7aef\u53e3\u590d\u7528\u7684\u5e94\u7528\u662f\u5f88\u5e38\u89c1\u7684 <\/p><\/div>\n<\/p><\/div>\n<\/li>\n

  • \n
    \n
    \n
    \u4e3b<\/span> \u8cc7\u6df1\u5927\u4f6c : LeeReamond <\/span> <\/div>\n
    <\/i> <\/span> <\/div>\n<\/p><\/div>\n
    @delpo \u611f\u8c22\uff0c\u9ed8\u8ba4 socket \u90fd\u63d0\u793a\u4e0d\u8ba9\u91cd\u590d\u7ed1\u5b9a\uff0c\u6ca1\u5199\u8fc7\u7c7b\u4f3c\u7684\u5e94\u7528\u3002\u5355\u8fdb\u7a0b\u5185 io \u590d\u7528\u6211\u89c9\u5f97\u633a\u597d\u7406\u89e3\u7684\uff0c\u591a\u8fdb\u7a0b\u95f4\u7ed1\u5b9a\u7684\u8bdd\u6d41\u4e0d\u5c31\u4e71\u4e86\u4e48\uff0c\u4e0d\u77e5\u9053\u6570\u636e\u7684\u54ea\u90e8\u5206\u53eb\u8c01\u53d6\u8d70\u4e86\u3002 <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
    \u8cc7\u6df1\u5927\u4f6c : delpo <\/span> <\/div>\n
    <\/i> <\/span> <\/div>\n<\/p><\/div>\n
    @LeeReamond \u53ea\u8981\u76ee\u7684\u5730\u4e8c\u5143\u7ec4\u4e0d\u540c\u5c31\u53ef\u4ee5\u5206\u8fa8\u6570\u636e\u6d41\u4f20\u8f93\u5230\u54ea\u4e2a socket <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
    \u4e3b<\/span> \u8cc7\u6df1\u5927\u4f6c : LeeReamond <\/span> <\/div>\n
    <\/i> <\/span> <\/div>\n<\/p><\/div>\n
    @delpo \u786e\u5b9e\uff0c\u5f88\u5408\u7406\uff0c\u6240\u4ee5\u610f\u601d\u662f\u9762\u5411\u8fde\u63a5\u8fd8\u662f\u72ec\u7acb\u7684\uff0c\u53ea\u4e0d\u8fc7\u591a\u8fdb\u7a0b\u516c\u7528\u4e00\u4e2a\u7aef\u53e3\u5730\u5740 <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n","protected":false},"excerpt":{"rendered":"

    TCP \u534f\u8bae\u4e2d\u7684 ACK \u5e94\u8be5\u600e\u4e48…<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[],"tags":[],"_links":{"self":[{"href":"http:\/\/4563.org\/index.php?rest_route=\/wp\/v2\/posts\/435791"}],"collection":[{"href":"http:\/\/4563.org\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/4563.org\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/4563.org\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/4563.org\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=435791"}],"version-history":[{"count":0,"href":"http:\/\/4563.org\/index.php?rest_route=\/wp\/v2\/posts\/435791\/revisions"}],"wp:attachment":[{"href":"http:\/\/4563.org\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=435791"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/4563.org\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=435791"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/4563.org\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=435791"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}