{"id":1528,"date":"2017-06-08T21:18:19","date_gmt":"2017-06-08T13:18:19","guid":{"rendered":"http:\/\/www.xttblog.com\/?p=1528"},"modified":"2017-06-08T21:18:19","modified_gmt":"2017-06-08T13:18:19","slug":"tcp-%e7%bd%91%e7%bb%9c%e5%8d%8f%e8%ae%ae%e7%ae%80%e4%bb%8b%e4%b8%89%e6%ac%a1%e6%8f%a1%e6%89%8b%e3%80%81%e5%9b%9b%e6%ac%a1%e6%96%ad%e5%bc%80","status":"publish","type":"post","link":"https:\/\/www.xttblog.com\/?p=1528","title":{"rendered":"TCP \u7f51\u7edc\u534f\u8bae\u7b80\u4ecb(\u4e09\u6b21\u63e1\u624b\u3001\u56db\u6b21\u65ad\u5f00)"},"content":{"rendered":"<p>\n\t\u4eca\u5929\u5728\u94f6\u884c\u91cc\u6392\u67e5\u4e00\u4e2a\u95ee\u9898\uff0c\u9047\u5230\u4e86ESB\u901a\u8baf\u95ee\u9898\u3002ESB \u67b6\u6784\u4e2d\u6574\u4f53\u91c7\u7528\u7684 Socket TCP \u901a\u8baf\u3002\u6709\u90e8\u5206\u540c\u4e8b\u5bf9\u7f51\u7edc\u534f\u8bae\u4e0d\u662f\u5f88\u7406\u89e3\u3002\u5c24\u5176\u662f TCP \u534f\u8bae\u3002\u6211\u8fd9\u91cc\u6574\u7406\u4e86\u4e00\u4e9b TCP \u534f\u8bae\u76f8\u5173\u7684\u77e5\u8bc6\u3002\u901a\u8fc7\u672c\u6587\u4ecb\u7ecd\u5b83\u7684\u4e00\u4e9b\u57fa\u7840\u77e5\u8bc6\u3002\n<\/p>\n<h2>\n\tTCP \u534f\u8bae\u7684\u4f5c\u7528<br \/>\n<\/h2>\n<p>\n\tTCP \u662f\u4e92\u8054\u7f51\u6838\u5fc3\u534f\u8bae\u4e4b\u4e00\u3002\u4e92\u8054\u7f51\u7531<a href=\"http:\/\/www.xttblog.com\/?p=1313\" name=\"\u4e92\u8054\u7f51\u534f\u8baeOSI\u4e03\u5c42\u53c2\u8003\u6a21\u578b\u8be6\u89e3(\u4e00)\" target=\"_blank\" title=\"\u4e92\u8054\u7f51\u534f\u8baeOSI\u4e03\u5c42\u53c2\u8003\u6a21\u578b\u8be6\u89e3(\u4e00)\">\u4e00\u6574\u5957\u534f\u8bae<\/a>\u6784\u6210\u3002TCP \u53ea\u662f\u5176\u4e2d\u7684\u4e00\u5c42\uff0c\u6709\u7740\u81ea\u5df1\u7684\u5206\u5de5\u3002\n<\/p>\n<p>\n\tTCP \u662f\u4ee5\u592a\u7f51\u534f\u8bae\u548c IP \u534f\u8bae\u7684\u4e0a\u5c42\u534f\u8bae\uff0c\u4e5f\u662f\u5e94\u7528\u5c42\u534f\u8bae\u7684\u4e0b\u5c42\u534f\u8bae\u3002\n<\/p>\n<p>\n\t\u6700\u5e95\u5c42\u7684\u4ee5\u592a\u7f51\u534f\u8bae\uff08Ethernet\uff09\u89c4\u5b9a\u4e86\u7535\u5b50\u4fe1\u53f7\u5982\u4f55\u7ec4\u6210\u6570\u636e\u5305\uff08packet\uff09\uff0c\u89e3\u51b3\u4e86\u5b50\u7f51\u5185\u90e8\u7684\u70b9\u5bf9\u70b9\u901a\u4fe1\u3002\n<\/p>\n<p>\n\t<img decoding=\"async\" alt=\"\u4ee5\u592a\u7f51\u534f\u8bae\u89e3\u51b3\u4e86\u5c40\u57df\u7f51\u7684\u70b9\u5bf9\u70b9\u901a\u4fe1\" src=\"http:\/\/img.bbs.csdn.net\/upload\/201706\/08\/1496926139_25054.jpg\" style=\"width: 638px;height: 479px\" \/>\n<\/p>\n<p>\n\t\u4f46\u662f\uff0c\u4ee5\u592a\u7f51\u534f\u8bae\u4e0d\u80fd\u89e3\u51b3\u591a\u4e2a\u5c40\u57df\u7f51\u5982\u4f55\u4e92\u901a\uff0c\u8fd9\u7531 IP \u534f\u8bae\u89e3\u51b3\u3002\n<\/p>\n<p>\n\t<img decoding=\"async\" alt=\"IP \u534f\u8bae\u53ef\u4ee5\u8fde\u63a5\u591a\u4e2a\u5c40\u57df\u7f51\" src=\"http:\/\/img.bbs.csdn.net\/upload\/201706\/08\/1496926212_833177.png\" style=\"width: 750px;height: 355px\" \/>\n<\/p>\n<p>\n\tIP \u534f\u8bae\u5b9a\u4e49\u4e86\u4e00\u5957\u81ea\u5df1\u7684\u5730\u5740\u89c4\u5219\uff0c\u79f0\u4e3a IP \u5730\u5740\u3002\u5b83\u5b9e\u73b0\u4e86\u8def\u7531\u529f\u80fd\uff0c\u5141\u8bb8\u67d0\u4e2a\u5c40\u57df\u7f51\u7684 A \u4e3b\u673a\uff0c\u5411\u53e6\u4e00\u4e2a\u5c40\u57df\u7f51\u7684 B \u4e3b\u673a\u53d1\u9001\u6d88\u606f\u3002\n<\/p>\n<p>\n\t\u8def\u7531\u5668\u5c31\u662f\u57fa\u4e8e IP \u534f\u8bae\u3002\u5c40\u57df\u7f51\u4e4b\u95f4\u8981\u9760\u8def\u7531\u5668\u8fde\u63a5\u3002\n<\/p>\n<p>\n\t\u8def\u7531\u7684\u539f\u7406\u5f88\u7b80\u5355\u3002\u5e02\u573a\u4e0a\u6240\u6709\u7684\u8def\u7531\u5668\uff0c\u80cc\u540e\u90fd\u6709\u5f88\u591a\u7f51\u53e3\uff0c\u8981\u63a5\u5165\u591a\u6839\u7f51\u7ebf\u3002\u8def\u7531\u5668\u5185\u90e8\u6709\u4e00\u5f20\u8def\u7531\u8868\uff0c\u89c4\u5b9a\u4e86 A \u6bb5 IP \u5730\u5740\u8d70\u51fa\u53e3\u4e00\uff0cB \u6bb5\u5730\u5740\u8d70\u51fa\u53e3\u4e8c\uff0c&#8230;&#8230;\u901a\u8fc7\u8fd9\u5957&quot;\u6307\u8def\u724c&quot;\uff0c\u5b9e\u73b0\u4e86\u6570\u636e\u5305\u7684\u8f6c\u53d1\u3002\n<\/p>\n<p>\n\t<img decoding=\"async\" alt=\"Local Route Table\" src=\"http:\/\/img.bbs.csdn.net\/upload\/201706\/08\/1496926432_199057.jpg\" style=\"width: 522px;height: 313px\" \/>\n<\/p>\n<p>\n\t\u672c\u673a\u7684\u8def\u7531\u8868\u6ce8\u660e\u4e86\u4e0d\u540c IP \u76ee\u7684\u5730\u7684\u6570\u636e\u5305\uff0c\u8981\u53d1\u9001\u5230\u54ea\u4e00\u4e2a\u7f51\u53e3\uff08interface\uff09\n<\/p>\n<p>\n\tIP \u534f\u8bae\u53ea\u662f\u4e00\u4e2a\u5730\u5740\u534f\u8bae\uff0c\u5e76\u4e0d\u4fdd\u8bc1\u6570\u636e\u5305\u7684\u5b8c\u6574\u3002\u5982\u679c\u8def\u7531\u5668\u4e22\u5305\uff08\u6bd4\u5982\u7f13\u5b58\u6ee1\u4e86\uff0c\u65b0\u8fdb\u6765\u7684\u6570\u636e\u5305\u5c31\u4f1a\u4e22\u5931\uff09\uff0c\u5c31\u9700\u8981\u53d1\u73b0\u4e22\u4e86\u54ea\u4e00\u4e2a\u5305\uff0c\u4ee5\u53ca\u5982\u4f55\u91cd\u65b0\u53d1\u9001\u8fd9\u4e2a\u5305\u3002\u8fd9\u5c31\u8981\u4f9d\u9760 TCP \u534f\u8bae\u3002<br \/>\n\t\u7b80\u5355\u8bf4\uff0cTCP \u534f\u8bae\u7684\u4f5c\u7528\u662f\uff0c\u4fdd\u8bc1\u6570\u636e\u901a\u4fe1\u7684\u5b8c\u6574\u6027\u548c\u53ef\u9760\u6027\uff0c\u9632\u6b62\u4e22\u5305\u3002\n<\/p>\n<h2>\n\tTCP \u6570\u636e\u5305\u7684\u5927\u5c0f<br \/>\n<\/h2>\n<p>\n\t\u4ee5\u592a\u7f51\u6570\u636e\u5305\uff08packet\uff09\u7684\u5927\u5c0f\u662f\u56fa\u5b9a\u7684\uff0c\u6700\u521d\u662f1518\u5b57\u8282\uff0c\u540e\u6765\u589e\u52a0\u52301522\u5b57\u8282\uff0815KB \uff09\u3002\u5176\u4e2d\uff0c 1500 \u5b57\u8282\u662f\u8d1f\u8f7d\uff08payload\uff09\uff0c22\u5b57\u8282\u662f\u5934\u4fe1\u606f\uff08head\uff09\u3002<br \/>\n\tIP \u6570\u636e\u5305\u5728\u4ee5\u592a\u7f51\u6570\u636e\u5305\u7684\u8d1f\u8f7d\u91cc\u9762\uff0c\u5b83\u4e5f\u6709\u81ea\u5df1\u7684\u5934\u4fe1\u606f\uff0c\u6700\u5c11\u9700\u898120\u5b57\u8282\uff0c\u6240\u4ee5 IP \u6570\u636e\u5305\u7684\u8d1f\u8f7d\u6700\u591a\u4e3a1480\u5b57\u8282\u3002\n<\/p>\n<p>\n\t<img decoding=\"async\" alt=\"TCP\/IP \u6570\u636e\u5305\" src=\"http:\/\/image.beekka.com\/blog\/201205\/bg2012052913.png\" style=\"width: 745px;height: 254px\" \/>\n<\/p>\n<p>\n\tIP \u6570\u636e\u5305\u5728\u4ee5\u592a\u7f51\u6570\u636e\u5305\u91cc\u9762\uff0cTCP \u6570\u636e\u5305\u5728 IP \u6570\u636e\u5305\u91cc\u9762\u3002\n<\/p>\n<p>\n\tTCP \u6570\u636e\u5305\u5728 IP \u6570\u636e\u5305\u7684\u8d1f\u8f7d\u91cc\u9762\u3002\u5b83\u7684\u5934\u4fe1\u606f\u6700\u5c11\u4e5f\u9700\u898120\u5b57\u8282\uff0c\u56e0\u6b64 TCP \u6570\u636e\u5305\u7684\u6700\u5927\u8d1f\u8f7d\u662f 1480 &#8211; 20 = 1460 \u5b57\u8282\u3002\u7531\u4e8e IP \u548c TCP \u534f\u8bae\u5f80\u5f80\u6709\u989d\u5916\u7684\u5934\u4fe1\u606f\uff0c\u6240\u4ee5 TCP \u8d1f\u8f7d\u5b9e\u9645\u4e3a1400\u5b57\u8282\u5de6\u53f3\u3002<br \/>\n\t\u56e0\u6b64\uff0c\u4e00\u67611500\u5b57\u8282\u7684\u4fe1\u606f\u9700\u8981\u4e24\u4e2a TCP \u6570\u636e\u5305\u3002HTTP\/2 \u534f\u8bae\u7684\u4e00\u5927\u6539\u8fdb\uff0c \u5c31\u662f\u538b\u7f29 HTTP \u534f\u8bae\u7684\u5934\u4fe1\u606f\uff0c\u4f7f\u5f97\u4e00\u4e2a HTTP \u8bf7\u6c42\u53ef\u4ee5\u653e\u5728\u4e00\u4e2a TCP \u6570\u636e\u5305\u91cc\u9762\uff0c\u800c\u4e0d\u662f\u5206\u6210\u591a\u4e2a\uff0c\u8fd9\u6837\u5c31\u63d0\u9ad8\u4e86\u901f\u5ea6\u3002\n<\/p>\n<p>\n\t<img decoding=\"async\" alt=\"TCP \u6570\u636e\u5305\u7684\u8d1f\u8f7d\" src=\"http:\/\/img.bbs.csdn.net\/upload\/201706\/08\/1496926717_866160.png\" style=\"width: 681px;height: 307px\" \/>\n<\/p>\n<p>\n\t\u4ee5\u592a\u7f51\u6570\u636e\u5305\u7684\u8d1f\u8f7d\u662f1500\u5b57\u8282\uff0cTCP \u6570\u636e\u5305\u7684\u8d1f\u8f7d\u57281400\u5b57\u8282\u5de6\u53f3\u3002\n<\/p>\n<p>\n\t\u4f60\u53ef\u80fd\u4f1a\u95ee\uff0c\u4e3a\u4ec0\u4e48\u4e00\u4e2a\u4ee5\u592a\u7f51\u6570\u636e\u5305\u53ea\u80fd\u67091500\u5b57\u8282\u8d1f\u8f7d\uff0c\u4e0d\u80fd\u8bbe\u8ba1\u5f97\u66f4\u5927\u4e00\u4e9b\u5417\uff1f<br \/>\n\t\u8fd9\u662f\u56e0\u4e3a\u8fd9\u4e9b\u534f\u8bae\u662f\u4e0a\u4e2a\u4e16\u7eaa\u8bbe\u8ba1\u7684\uff0c\u5fc5\u987b\u8003\u8651\u5230\u90a3\u65f6\u7684\u786c\u4ef6\u72b6\u51b5\u3002\u5982\u679c\u6570\u636e\u5305\u592a\u5927\uff0c\u5c31\u4f1a\u5360\u7528\u66f4\u591a\u7684\u7f13\u5b58\u3002\u5982\u679c\u7f13\u5b58\u6ea2\u51fa\uff0c\u5c31\u4f1a\u5927\u91cf\u4e22\u5305\uff0c\u964d\u4f4e\u6574\u4e2a\u7f51\u7edc\u7684\u901a\u4fe1\u6548\u7387\u3002\n<\/p>\n<h2>\n\tTCP \u6570\u636e\u5305\u7684\u7f16\u53f7\uff08SEQ\uff09<br \/>\n<\/h2>\n<p>\n\t\u4e00\u4e2a\u53051400\u5b57\u8282\uff0c\u90a3\u4e48\u4e00\u6b21\u6027\u53d1\u9001\u5927\u91cf\u6570\u636e\uff0c\u5c31\u5fc5\u987b\u5206\u6210\u591a\u4e2a\u5305\u3002\u6bd4\u5982\uff0c\u4e00\u4e2a 10MB \u7684\u6587\u4ef6\uff0c\u9700\u8981\u53d1\u90017100\u591a\u4e2a\u5305\u3002<br \/>\n\t\u53d1\u9001\u7684\u65f6\u5019\uff0cTCP \u534f\u8bae\u4e3a\u6bcf\u4e2a\u5305\u7f16\u53f7\uff08sequence number\uff0c\u7b80\u79f0 SEQ\uff09\uff0c\u4ee5\u4fbf\u63a5\u6536\u7684\u4e00\u65b9\u6309\u7167\u987a\u5e8f\u8fd8\u539f\u3002\u4e07\u4e00\u53d1\u751f\u4e22\u5305\uff0c\u4e5f\u53ef\u4ee5\u77e5\u9053\u4e22\u5931\u7684\u662f\u54ea\u4e00\u4e2a\u5305\u3002<br \/>\n\t\u7b2c\u4e00\u4e2a\u5305\u7684\u7f16\u53f7\u662f\u4e00\u4e2a\u968f\u673a\u6570\u3002\u4e3a\u4e86\u4fbf\u4e8e\u7406\u89e3\uff0c\u8fd9\u91cc\u5c31\u628a\u5b83\u79f0\u4e3a1\u53f7\u5305\u3002\u5047\u5b9a\u8fd9\u4e2a\u5305\u7684\u8d1f\u8f7d\u957f\u5ea6\u662f100\u5b57\u8282\uff0c\u90a3\u4e48\u53ef\u4ee5\u63a8\u7b97\u51fa\u4e0b\u4e00\u4e2a\u5305\u7684\u7f16\u53f7\u5e94\u8be5\u662f101\u3002\u8fd9\u5c31\u662f\u8bf4\uff0c\u6bcf\u4e2a\u6570\u636e\u5305\u90fd\u53ef\u4ee5\u5f97\u5230\u4e24\u4e2a\u7f16\u53f7\uff1a\u81ea\u8eab\u7684\u7f16\u53f7\uff0c\u4ee5\u53ca\u4e0b\u4e00\u4e2a\u5305\u7684\u7f16\u53f7\u3002\u63a5\u6536\u65b9\u7531\u6b64\u77e5\u9053\uff0c\u5e94\u8be5\u6309\u7167\u4ec0\u4e48\u987a\u5e8f\u5c06\u5b83\u4eec\u8fd8\u539f\u6210\u539f\u59cb\u6587\u4ef6\u3002\n<\/p>\n<p>\n\t<img decoding=\"async\" alt=\"TCP\/IP \u6293\u5305\u5206\u6790\" src=\"http:\/\/img.bbs.csdn.net\/upload\/201706\/08\/1496926941_230168.png\" style=\"width: 517px;height: 247px\" \/>\n<\/p>\n<p>\n\t\u5f53\u524d\u5305\u7684\u7f16\u53f7\u662f45943\uff0c\u4e0b\u4e00\u4e2a\u6570\u636e\u5305\u7684\u7f16\u53f7\u662f46183\uff0c\u7531\u6b64\u53ef\u77e5\uff0c\u8fd9\u4e2a\u5305\u7684\u8d1f\u8f7d\u662f240\u5b57\u8282\u3002\n<\/p>\n<h2>\n\tTCP \u6570\u636e\u5305\u7684\u7ec4\u88c5<br \/>\n<\/h2>\n<p>\n\t\u6536\u5230 TCP \u6570\u636e\u5305\u4ee5\u540e\uff0c\u7ec4\u88c5\u8fd8\u539f\u662f\u64cd\u4f5c\u7cfb\u7edf\u5b8c\u6210\u7684\u3002\u5e94\u7528\u7a0b\u5e8f\u4e0d\u4f1a\u76f4\u63a5\u5904\u7406 TCP \u6570\u636e\u5305\u3002<br \/>\n\t\u5bf9\u4e8e\u5e94\u7528\u7a0b\u5e8f\u6765\u8bf4\uff0c\u4e0d\u7528\u5173\u5fc3\u6570\u636e\u901a\u4fe1\u7684\u7ec6\u8282\u3002\u9664\u975e\u7ebf\u8def\u5f02\u5e38\uff0c\u6536\u5230\u7684\u603b\u662f\u5b8c\u6574\u7684\u6570\u636e\u3002\u5e94\u7528\u7a0b\u5e8f\u9700\u8981\u7684\u6570\u636e\u653e\u5728 TCP \u6570\u636e\u5305\u91cc\u9762\uff0c\u6709\u81ea\u5df1\u7684\u683c\u5f0f\uff08\u6bd4\u5982 HTTP \u534f\u8bae\uff09\u3002<br \/>\n\tTCP \u5e76\u6ca1\u6709\u63d0\u4f9b\u4efb\u4f55\u673a\u5236\uff0c\u8868\u793a\u539f\u59cb\u6587\u4ef6\u7684\u5927\u5c0f\uff0c\u8fd9\u7531\u5e94\u7528\u5c42\u7684\u534f\u8bae\u6765\u89c4\u5b9a\u3002\u6bd4\u5982\uff0cHTTP \u534f\u8bae\u5c31\u6709\u4e00\u4e2a\u5934\u4fe1\u606fContent-Length\uff0c\u8868\u793a\u4fe1\u606f\u4f53\u7684\u5927\u5c0f\u3002\u5bf9\u4e8e\u64cd\u4f5c\u7cfb\u7edf\u6765\u8bf4\uff0c\u5c31\u662f\u6301\u7eed\u5730\u63a5\u6536 TCP \u6570\u636e\u5305\uff0c\u5c06\u5b83\u4eec\u6309\u7167\u987a\u5e8f\u7ec4\u88c5\u597d\uff0c\u4e00\u4e2a\u5305\u90fd\u4e0d\u5c11\u3002<br \/>\n\t\u64cd\u4f5c\u7cfb\u7edf\u4e0d\u4f1a\u53bb\u5904\u7406 TCP \u6570\u636e\u5305\u91cc\u9762\u7684\u6570\u636e\u3002\u4e00\u65e6\u7ec4\u88c5\u597d TCP \u6570\u636e\u5305\uff0c\u5c31\u628a\u5b83\u4eec\u8f6c\u4ea4\u7ed9\u5e94\u7528\u7a0b\u5e8f\u3002TCP \u6570\u636e\u5305\u91cc\u9762\u6709\u4e00\u4e2a\u7aef\u53e3\uff08port\uff09\u53c2\u6570\uff0c\u5c31\u662f\u7528\u6765\u6307\u5b9a\u8f6c\u4ea4\u7ed9\u76d1\u542c\u8be5\u7aef\u53e3\u7684\u5e94\u7528\u7a0b\u5e8f\u3002\n<\/p>\n<p>\n\t<img decoding=\"async\" alt=\"Mib Table[tcpConnEntry]\" src=\"http:\/\/img.bbs.csdn.net\/upload\/201706\/08\/1496927144_17829.jpg\" style=\"width: 610px;height: 293px\" \/>\n<\/p>\n<p>\n\t\u7cfb\u7edf\u6839\u636e TCP \u6570\u636e\u5305\u91cc\u9762\u7684\u7aef\u53e3\uff0c\u5c06\u7ec4\u88c5\u597d\u7684\u6570\u636e\u8f6c\u4ea4\u7ed9\u76f8\u5e94\u7684\u5e94\u7528\u7a0b\u5e8f\u3002\u4e0a\u56fe\u4e2d\uff0c21\u7aef\u53e3\u662f FTP \u670d\u52a1\u5668\uff0c25\u7aef\u53e3\u662f SMTP \u670d\u52a1\uff0c80\u7aef\u53e3\u662f Web \u670d\u52a1\u5668\u3002\n<\/p>\n<p>\n\t\u5e94\u7528\u7a0b\u5e8f\u6536\u5230\u7ec4\u88c5\u597d\u7684\u539f\u59cb\u6570\u636e\uff0c\u4ee5\u6d4f\u89c8\u5668\u4e3a\u4f8b\uff0c\u5c31\u4f1a\u6839\u636e HTTP \u534f\u8bae\u7684Content-Length\u5b57\u6bb5\u6b63\u786e\u8bfb\u51fa\u4e00\u6bb5\u6bb5\u7684\u6570\u636e\u3002\u8fd9\u4e5f\u610f\u5473\u7740\uff0c\u4e00\u6b21 TCP \u901a\u4fe1\u53ef\u4ee5\u5305\u62ec\u591a\u4e2a HTTP \u901a\u4fe1\u3002\n<\/p>\n<h2>\n\t\u6162\u542f\u52a8\u548c ACK<br \/>\n<\/h2>\n<p>\n\t\u670d\u52a1\u5668\u53d1\u9001\u6570\u636e\u5305\uff0c\u5f53\u7136\u8d8a\u5feb\u8d8a\u597d\uff0c\u6700\u597d\u4e00\u6b21\u6027\u5168\u53d1\u51fa\u53bb\u3002\u4f46\u662f\uff0c\u53d1\u5f97\u592a\u5feb\uff0c\u5c31\u6709\u53ef\u80fd\u4e22\u5305\u3002\u5e26\u5bbd\u5c0f\u3001\u8def\u7531\u5668\u8fc7\u70ed\u3001\u7f13\u5b58\u6ea2\u51fa\u7b49\u8bb8\u591a\u56e0\u7d20\u90fd\u4f1a\u5bfc\u81f4\u4e22\u5305\u3002\u7ebf\u8def\u4e0d\u597d\u7684\u8bdd\uff0c\u53d1\u5f97\u8d8a\u5feb\uff0c\u4e22\u5f97\u8d8a\u591a\u3002<br \/>\n\t\u6700\u7406\u60f3\u7684\u72b6\u6001\u662f\uff0c\u5728\u7ebf\u8def\u5141\u8bb8\u7684\u60c5\u51b5\u4e0b\uff0c\u8fbe\u5230\u6700\u9ad8\u901f\u7387\u3002\u4f46\u662f\u6211\u4eec\u600e\u4e48\u77e5\u9053\uff0c\u5bf9\u65b9\u7ebf\u8def\u7684\u7406\u60f3\u901f\u7387\u662f\u591a\u5c11\u5462\uff1f\u7b54\u6848\u5c31\u662f\u6162\u6162\u8bd5\u3002<br \/>\n\tTCP \u534f\u8bae\u4e3a\u4e86\u505a\u5230\u6548\u7387\u4e0e\u53ef\u9760\u6027\u7684\u7edf\u4e00\uff0c\u8bbe\u8ba1\u4e86\u4e00\u4e2a\u6162\u542f\u52a8\uff08slow start\uff09\u673a\u5236\u3002\u5f00\u59cb\u7684\u65f6\u5019\uff0c\u53d1\u9001\u5f97\u8f83\u6162\uff0c\u7136\u540e\u6839\u636e\u4e22\u5305\u7684\u60c5\u51b5\uff0c\u8c03\u6574\u901f\u7387\uff1a\u5982\u679c\u4e0d\u4e22\u5305\uff0c\u5c31\u52a0\u5feb\u53d1\u9001\u901f\u5ea6\uff1b\u5982\u679c\u4e22\u5305\uff0c\u5c31\u964d\u4f4e\u53d1\u9001\u901f\u5ea6\u3002<br \/>\n\tLinux \u5185\u6838\u91cc\u9762\u8bbe\u5b9a\u4e86\uff08\u5e38\u91cfTCP_INIT_CWND\uff09\uff0c\u521a\u5f00\u59cb\u901a\u4fe1\u7684\u65f6\u5019\uff0c\u53d1\u9001\u65b9\u4e00\u6b21\u6027\u53d1\u900110\u4e2a\u6570\u636e\u5305\uff0c\u5373&quot;\u53d1\u9001\u7a97\u53e3&quot;\u7684\u5927\u5c0f\u4e3a10\u3002\u7136\u540e\u505c\u4e0b\u6765\uff0c\u7b49\u5f85\u63a5\u6536\u65b9\u7684\u786e\u8ba4\uff0c\u518d\u7ee7\u7eed\u53d1\u9001\u3002<br \/>\n\t\u9ed8\u8ba4\u60c5\u51b5\u4e0b\uff0c\u63a5\u6536\u65b9\u6bcf\u6536\u5230\u4e24\u4e2a TCP \u6570\u636e\u5305\uff0c\u5c31\u8981\u53d1\u9001\u4e00\u4e2a\u786e\u8ba4\u6d88\u606f\u3002&quot;\u786e\u8ba4&quot;\u7684\u82f1\u8bed\u662f acknowledgement\uff0c\u6240\u4ee5\u8fd9\u4e2a\u786e\u8ba4\u6d88\u606f\u5c31\u7b80\u79f0 ACK\u3002<br \/>\n\tACK \u643a\u5e26\u4e24\u4e2a\u4fe1\u606f\u3002\n<\/p>\n<ul>\n<li>\n\t\t\u671f\u5f85\u8981\u6536\u5230\u4e0b\u4e00\u4e2a\u6570\u636e\u5305\u7684\u7f16\u53f7\n\t<\/li>\n<li>\n\t\t\u63a5\u6536\u65b9\u7684\u63a5\u6536\u7a97\u53e3\u7684\u5269\u4f59\u5bb9\u91cf\n\t<\/li>\n<\/ul>\n<p>\n\t\u53d1\u9001\u65b9\u6709\u4e86\u8fd9\u4e24\u4e2a\u4fe1\u606f\uff0c\u518d\u52a0\u4e0a\u81ea\u5df1\u5df2\u7ecf\u53d1\u51fa\u7684\u6570\u636e\u5305\u7684\u6700\u65b0\u7f16\u53f7\uff0c\u5c31\u4f1a\u63a8\u6d4b\u51fa\u63a5\u6536\u65b9\u5927\u6982\u7684\u63a5\u6536\u901f\u5ea6\uff0c\u4ece\u800c\u964d\u4f4e\u6216\u589e\u52a0\u53d1\u9001\u901f\u7387\u3002\u8fd9\u88ab\u79f0\u4e3a&quot;\u53d1\u9001\u7a97\u53e3&quot;\uff0c\u8fd9\u4e2a\u7a97\u53e3\u7684\u5927\u5c0f\u662f\u53ef\u53d8\u7684\u3002\n<\/p>\n<p>\n\t<img decoding=\"async\" alt=\"TCP \u53d1\u9001\u7a97\u53e3\" src=\"http:\/\/img.bbs.csdn.net\/upload\/201706\/08\/1496927450_380837.png\" style=\"width: 666px;height: 586px\" \/>\n<\/p>\n<p>\n\t\u6bcf\u4e2a ACK \u90fd\u5e26\u6709\u4e0b\u4e00\u4e2a\u6570\u636e\u5305\u7684\u7f16\u53f7\uff0c\u4ee5\u53ca\u63a5\u6536\u7a97\u53e3\u7684\u5269\u4f59\u5bb9\u91cf\u3002\u53cc\u65b9\u90fd\u4f1a\u53d1\u9001 ACK\u3002\n<\/p>\n<p>\n\t\u6ce8\u610f\uff0c\u7531\u4e8e TCP \u901a\u4fe1\u662f\u53cc\u5411\u7684\uff0c\u6240\u4ee5\u53cc\u65b9\u90fd\u9700\u8981\u53d1\u9001 ACK\u3002\u4e24\u65b9\u7684\u7a97\u53e3\u5927\u5c0f\uff0c\u5f88\u53ef\u80fd\u662f\u4e0d\u4e00\u6837\u7684\u3002\u800c\u4e14 ACK \u53ea\u662f\u5f88\u7b80\u5355\u7684\u51e0\u4e2a\u5b57\u6bb5\uff0c\u901a\u5e38\u4e0e\u6570\u636e\u5408\u5e76\u5728\u4e00\u4e2a\u6570\u636e\u5305\u91cc\u9762\u53d1\u9001\u3002\n<\/p>\n<p>\n\t<img decoding=\"async\" alt=\"TCP \u4e09\u6b21\u63e1\u624b\" src=\"http:\/\/img.bbs.csdn.net\/upload\/201706\/08\/1496927526_8262.jpg\" style=\"width: 600px;height: 238px\" \/>\n<\/p>\n<p>\n\t\u4e0a\u56fe\u4e00\u51714\u6b21\u901a\u4fe1\u3002\u7b2c\u4e00\u6b21\u901a\u4fe1\uff0cA \u4e3b\u673a\u53d1\u7ed9B \u4e3b\u673a\u7684\u6570\u636e\u5305\u7f16\u53f7\u662f1\uff0c\u957f\u5ea6\u662f100\u5b57\u8282\uff0c\u56e0\u6b64\u7b2c\u4e8c\u6b21\u901a\u4fe1 B \u4e3b\u673a\u7684 ACK \u7f16\u53f7\u662f 1 + 100 = 101\uff0c\u7b2c\u4e09\u6b21\u901a\u4fe1 A \u4e3b\u673a\u7684\u6570\u636e\u5305\u7f16\u53f7\u4e5f\u662f 101\u3002\u540c\u7406\uff0c\u7b2c\u4e8c\u6b21\u901a\u4fe1 B \u4e3b\u673a\u53d1\u7ed9 A \u4e3b\u673a\u7684\u6570\u636e\u5305\u7f16\u53f7\u662f1\uff0c\u957f\u5ea6\u662f200\u5b57\u8282\uff0c\u56e0\u6b64\u7b2c\u4e09\u6b21\u901a\u4fe1 A \u4e3b\u673a\u7684 ACK \u662f201\uff0c\u7b2c\u56db\u6b21\u901a\u4fe1 B \u4e3b\u673a\u7684\u6570\u636e\u5305\u7f16\u53f7\u4e5f\u662f201\u3002\n<\/p>\n<p>\n\t\u5373\u4f7f\u5bf9\u4e8e\u5e26\u5bbd\u5f88\u5927\u3001\u7ebf\u8def\u5f88\u597d\u7684\u8fde\u63a5\uff0cTCP \u4e5f\u603b\u662f\u4ece10\u4e2a\u6570\u636e\u5305\u5f00\u59cb\u6162\u6162\u8bd5\uff0c\u8fc7\u4e86\u4e00\u6bb5\u65f6\u95f4\u4ee5\u540e\uff0c\u624d\u8fbe\u5230\u6700\u9ad8\u7684\u4f20\u8f93\u901f\u7387\u3002\u8fd9\u5c31\u662f TCP \u7684\u6162\u542f\u52a8\u3002\n<\/p>\n<h2>\n\t\u6570\u636e\u5305\u7684\u9057\u5931\u5904\u7406<br \/>\n<\/h2>\n<p>\n\tTCP \u534f\u8bae\u53ef\u4ee5\u4fdd\u8bc1\u6570\u636e\u901a\u4fe1\u7684\u5b8c\u6574\u6027\uff0c\u8fd9\u662f\u600e\u4e48\u505a\u5230\u7684\uff1f<br \/>\n\t\u524d\u9762\u8bf4\u8fc7\uff0c\u6bcf\u4e00\u4e2a\u6570\u636e\u5305\u90fd\u5e26\u6709\u4e0b\u4e00\u4e2a\u6570\u636e\u5305\u7684\u7f16\u53f7\u3002\u5982\u679c\u4e0b\u4e00\u4e2a\u6570\u636e\u5305\u6ca1\u6709\u6536\u5230\uff0c\u90a3\u4e48 ACK \u7684\u7f16\u53f7\u5c31\u4e0d\u4f1a\u53d1\u751f\u53d8\u5316\u3002<br \/>\n\t\u4e3e\u4f8b\u6765\u8bf4\uff0c\u73b0\u5728\u6536\u5230\u4e864\u53f7\u5305\uff0c\u4f46\u662f\u6ca1\u6709\u6536\u52305\u53f7\u5305\u3002ACK \u5c31\u4f1a\u8bb0\u5f55\uff0c\u671f\u5f85\u6536\u52305\u53f7\u5305\u3002\u8fc7\u4e86\u4e00\u6bb5\u65f6\u95f4\uff0c5\u53f7\u5305\u6536\u5230\u4e86\uff0c\u90a3\u4e48\u4e0b\u4e00\u8f6e ACK \u4f1a\u66f4\u65b0\u7f16\u53f7\u3002\u5982\u679c5\u53f7\u5305\u8fd8\u662f\u6ca1\u6536\u5230\uff0c\u4f46\u662f\u6536\u5230\u4e866\u53f7\u5305\u62167\u53f7\u5305\uff0c\u90a3\u4e48 ACK \u91cc\u9762\u7684\u7f16\u53f7\u4e0d\u4f1a\u53d8\u5316\uff0c\u603b\u662f\u663e\u793a5\u53f7\u5305\u3002\u8fd9\u4f1a\u5bfc\u81f4\u5927\u91cf\u91cd\u590d\u5185\u5bb9\u7684 ACK\u3002<br \/>\n\t\u5982\u679c\u53d1\u9001\u65b9\u53d1\u73b0\u6536\u5230\u4e09\u4e2a\u8fde\u7eed\u7684\u91cd\u590d ACK\uff0c\u6216\u8005\u8d85\u65f6\u4e86\u8fd8\u6ca1\u6709\u6536\u5230\u4efb\u4f55 ACK\uff0c\u5c31\u4f1a\u786e\u8ba4\u4e22\u5305\uff0c\u53735\u53f7\u5305\u9057\u5931\u4e86\uff0c\u4ece\u800c\u518d\u6b21\u53d1\u9001\u8fd9\u4e2a\u5305\u3002\u901a\u8fc7\u8fd9\u79cd\u673a\u5236\uff0cTCP \u4fdd\u8bc1\u4e86\u4e0d\u4f1a\u6709\u6570\u636e\u5305\u4e22\u5931\u3002\n<\/p>\n<p>\n\t<img decoding=\"async\" alt=\"TCP \u6570\u636e\u5305\u7684\u9057\u5931\u5904\u7406\" src=\"http:\/\/img.bbs.csdn.net\/upload\/201706\/08\/1496927630_686316.png\" style=\"width: 424px;height: 492px\" \/>\n<\/p>\n<p>\n\tHost B \u6ca1\u6709\u6536\u5230100\u53f7\u6570\u636e\u5305\uff0c\u4f1a\u8fde\u7eed\u53d1\u51fa\u76f8\u540c\u7684 ACK\uff0c\u89e6\u53d1 Host A \u91cd\u53d1100\u53f7\u6570\u636e\u5305\u3002\n<\/p>\n<h2>\n\t\u53c2\u8003\u8d44\u6599<br \/>\n<\/h2>\n<ul>\n<li>\n\t\t<a href=\"https:\/\/www.destroyallsoftware.com\/compendium\/network-protocols\" target=\"_blank\">Network protocols for programmers who know at least one programming language<\/a>\n\t<\/li>\n<li>\n\t\t<a href=\"http:\/\/www.xttblog.com\/?p=1313\" name=\"\u4e92\u8054\u7f51\u534f\u8baeOSI\u4e03\u5c42\u53c2\u8003\u6a21\u578b\u8be6\u89e3(\u4e00)\" target=\"_blank\" title=\"\u4e92\u8054\u7f51\u534f\u8baeOSI\u4e03\u5c42\u53c2\u8003\u6a21\u578b\u8be6\u89e3(\u4e00)\">\u4e92\u8054\u7f51\u534f\u8baeOSI\u4e03\u5c42\u53c2\u8003\u6a21\u578b\u8be6\u89e3(\u4e00)<\/a>\n\t<\/li>\n<li>\n\t\t<a href=\"http:\/\/www.xttblog.com\/?p=1315\" name=\"\u4e92\u8054\u7f51\u534f\u8baeOSI\u4e03\u5c42\u53c2\u8003\u6a21\u578b\u8be6\u89e3(\u4e8c)\" target=\"_blank\" title=\"\u4e92\u8054\u7f51\u534f\u8baeOSI\u4e03\u5c42\u53c2\u8003\u6a21\u578b\u8be6\u89e3(\u4e8c)\">\u4e92\u8054\u7f51\u534f\u8baeOSI\u4e03\u5c42\u53c2\u8003\u6a21\u578b\u8be6\u89e3(\u4e8c)<\/a>\n\t<\/li>\n<\/ul>\n<!-- <audio autoplay=\"autoplay\" height=\"100\" width=\"100\" hidden=\"true\"><source src=\"https:\/\/c.coka.la\/orAvPR.mp3\" type=\"audio\/mp3\"\/><\/audio><img decoding=\"async\" src=\"https:\/\/images.weserv.nl\/?url=https:\/\/ws3.sinaimg.cn\/large\/8fa5dcfcgy1g4em3rzar5j20ib089ae0.jpg\" alt=\"\u4e1a\u4f59\u8349\u516c\u4f17\u53f7\"\/> --><p><!-- <img decoding=\"async\" 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