{"id":1045,"date":"2021-04-23T11:06:18","date_gmt":"2021-04-23T03:06:18","guid":{"rendered":"https:\/\/www.linuxdevops.cn\/?p=1045"},"modified":"2022-06-15T15:24:10","modified_gmt":"2022-06-15T07:24:10","slug":"detailed-explanation-of-tcp-three-handshakes-and-four-waves","status":"publish","type":"post","link":"https:\/\/www.linuxdevops.cn\/2021\/04\/detailed-explanation-of-tcp-three-handshakes-and-four-waves\/","title":{"rendered":"TCP\u4e09\u6b21\u63e1\u624b\u4e0e\u56db\u6b21\u6325\u624b\u8be6\u89e3[\u52a8\u753b]"},"content":{"rendered":"
\n

\u8f6c\u8f7d\u58f0\u660e<\/h2>\n

\u52a8\u753b\uff1a\u7528\u52a8\u753b\u7ed9\u9762\u8bd5\u5b98\u89e3\u91ca TCP \u4e09\u6b21\u63e1\u624b\u8fc7\u7a0b<\/a><\/p>\n

\u52a8\u753b\uff1a\u7528\u52a8\u753b\u7ed9\u5973\u670b\u53cb\u8bb2\u89e3 TCP \u56db\u6b21\u5206\u624b\u8fc7\u7a0b<\/a><\/p>\n<\/blockquote>\n

\u4e00\u3001TCP \u662f\u4ec0\u4e48\uff1f<\/h2>\n

TCP\uff08Transmission Control Protocol \u4f20\u8f93\u63a7\u5236\u534f\u8bae\uff09\u662f\u4e00\u79cd\u9762\u5411\u8fde\u63a5\u7684\u3001\u53ef\u9760\u7684\u3001\u57fa\u4e8e\u5b57\u8282\u6d41\u7684\u4f20\u8f93\u5c42\u901a\u4fe1\u534f\u8bae\u3002<\/p>\n

\u6211\u4eec\u77e5\u9053\u4e86\u4e0a\u8ff0\u4e86\u89e3\u5230\u4e86 TCP \u7684\u5b9a\u4e49\uff0c\u901a\u4fd7\u4e00\u70b9\u7684\u8bb2\uff0cTCP \u5c31\u662f\u4e00\u4e2a\u53cc\u65b9\u901a\u4fe1\u7684\u4e00\u4e2a\u89c4\u8303\u6807\u51c6\uff08\u534f\u8bae\uff09\u3002<\/p>\n

\u6211\u4eec\u5728\u5b66\u4e60 TCP \u63e1\u624b\u8fc7\u7a0b\u4e4b\u524d\uff0c\u9996\u5148\u5fc5\u987b\u4e86\u89e3 TCP \u62a5\u6587\u5934\u90e8\u7684\u4e00\u4e9b\u6807\u5fd7\u4fe1\u606f\uff0c\u56e0\u4e3a\u5728 TCP \u63e1\u624b\u7684\u8fc7\u7a0b\u4e2d\uff0c\u4f1a\u4f7f\u7528\u5230\u8fd9\u4e9b\u62a5\u6587\u4fe1\u606f\uff0c\u5982\u679c\u6ca1\u6709\u638c\u63e1\u8fd9\u4e9b\u4fe1\u606f\uff0c\u5728\u5b66\u4e60\u63e1\u624b\u8fc7\u7a0b\u4e2d\uff0c\u6574\u4e2a\u4eba\u5904\u4e8e\u61f5\u903c\u72b6\u6001\uff0c\u4e5f\u662f\u4e3a\u4e86\u80fd\u591f\u6df1\u5165 TCP \u4e09\u6b21\u63e1\u624b\u7684\u539f\u7406\u3002<\/p>\n

\u4e8c\u3001TCP \u5934\u90e8\u62a5\u6587<\/h2>\n

\"mAFrei-1619052586994\"<\/p>\n

2.1 source port \u548c destination port<\/h3>\n

\u4e24\u8005\u5206\u522b\u4e3a\u300c\u6e90\u7aef\u53e3\u53f7\u300d\u548c\u300c\u76ee\u7684\u7aef\u53e3\u53f7\u300d\u3002\u6e90\u7aef\u53e3\u53f7\u5c31\u662f\u6307\u672c\u5730\u7aef\u53e3\uff0c\u76ee\u7684\u7aef\u53e3\u5c31\u662f\u8fdc\u7a0b\u7aef\u53e3\u3002<\/p>\n

\u4e00\u4e2a\u6570\u636e\u5305\uff08pocket\uff09\u88ab\u89e3\u5c01\u88c5\u6210\u6570\u636e\u6bb5\uff08segment\uff09\u540e\u5c31\u4f1a\u6d89\u53ca\u5230\u8fde\u63a5\u4e0a\u5c42\u534f\u8bae\u7684\u7aef\u53e3\u95ee\u9898\u3002<\/p>\n

\u53ef\u4ee5\u8fd9\u4e48\u7406\u89e3\uff0c\u6211\u4eec\u53ef\u4ee5\u60f3\u8c61\u53d1\u9001\u65b9\u5f88\u591a\u7684\u7a97\u6237\uff0c\u63a5\u6536\u65b9\u4e5f\u6709\u5f88\u591a\u7684\u7a97\u6237\uff0c\u8fd9\u4e9b\u7a97\u53e3\u90fd\u6807\u6709\u4e0d\u540c\u7684\u7aef\u53e3\u53f7\uff0c\u6e90\u7aef\u53e3\u53f7\u548c\u76ee\u7684\u7aef\u53e3\u53f7\u5c31\u5206\u522b\u4ee3\u8868\u4ece\u54ea\u4e2a\u89c4\u5b9a\u7684\u4e32\u53e3\u53d1\u9001\u5230\u5bf9\u65b9\u63a5\u6536\u7684\u7a97\u53e3\u3002\u4e0d\u540c\u7684\u5e94\u7528\u7a0b\u5ea6\u90fd\u6709\u7740\u4e0d\u540c\u7684\u7aef\u53e3\uff0c\u4e4b\u524d\u7f51\u7edc\u5206\u5c42\u7684\u6587\u7ae0\u4e2d\u6709\u63d0\u5230\u8fc7\u3002
\n\"6Z8krd-1619052629141\"<\/p>\n

\n

\u6269\u5c55\uff1a\u5e94\u7528\u7a0b\u5e8f\u7684\u7aef\u53e3\u53f7\u548c\u5e94\u7528\u7a0b\u5e8f\u6240\u5728\u4e3b\u673a\u7684 IP \u5730\u5740\u7edf\u79f0\u4e3a socket\uff08\u5957\u63a5\u5b57\uff09\uff0cIP:\u7aef\u53e3\u53f7, \u5728\u4e92\u8054\u7f51\u4e0a socket \u552f\u4e00\u6807\u8bc6\u6bcf\u4e00\u4e2a\u5e94\u7528\u7a0b\u5e8f\uff0c\u6e90\u7aef\u53e3+\u6e90IP+\u76ee\u7684\u7aef\u53e3+\u76ee\u7684IP\u79f0\u4e3a\u201d\u5957\u63a5\u5b57\u5bf9\u201c\uff0c\u4e00\u5bf9\u5957\u63a5\u5b57\u5c31\u662f\u4e00\u4e2a\u8fde\u63a5\uff0c\u4e00\u4e2a\u5ba2\u6237\u7aef\u4e0e\u670d\u52a1\u5668\u4e4b\u95f4\u7684\u8fde\u63a5\u3002<\/p>\n<\/blockquote>\n

2.2 Sequence Numbe<\/code><\/h3>\n
\n

\u79f0\u4e3a\u300c\u5e8f\u5217\u53f7\u300d\u3002\u7528\u4e8e TCP \u901a\u4fe1\u8fc7\u7a0b\u4e2d\u67d0\u4e00\u4f20\u8f93\u65b9\u5411\u4e0a\u5b57\u8282\u6d41\u7684\u6bcf\u4e2a\u5b57\u8282\u7684\u7f16\u53f7\uff0c\u4e3a\u4e86\u786e\u4fdd\u6570\u636e\u901a\u4fe1\u7684\u6709\u5e8f\u6027\uff0c\u907f\u514d\u7f51\u7edc\u4e2d\u4e71\u5e8f\u7684\u95ee\u9898\u3002\u63a5\u6536\u7aef\u6839\u636e\u8fd9\u4e2a\u7f16\u53f7\u8fdb\u884c\u786e\u8ba4\uff0c\u4fdd\u8bc1\u5206\u5272\u7684\u6570\u636e\u6bb5\u5728\u539f\u59cb\u6570\u636e\u5305\u7684\u4f4d\u7f6e\u3002<\/p>\n<\/blockquote>\n

\"KNGFBK-1619052667652\"<\/p>\n

\u518d\u901a\u4fd7\u4e00\u70b9\u7684\u8bb2\uff0c\u6bcf\u4e2a\u5b57\u6bb5\u5728\u4f20\u9001\u4e2d\u7528\u5e8f\u5217\u53f7\u6765\u6807\u8bb0\u81ea\u5df1\u4f4d\u7f6e\u7684\uff0c\u800c\u8fd9\u4e2a\u5b57\u6bb5\u5c31\u662f\u7528\u6765\u5b8c\u6210\u53cc\u65b9\u4f20\u8f93\u4e2d\u786e\u4fdd\u5b57\u6bb5\u539f\u59cb\u4f4d\u7f6e\u662f\u6309\u7167\u4f20\u8f93\u987a\u5e8f\u7684\u3002\uff08\u53d1\u9001\u65b9\u662f\u6570\u636e\u662f\u600e\u6837\u4e00\u4e2a\u987a\u5e8f\uff0c\u5230\u4e86\u63a5\u53d7\u65b9\u4e5f\u8981\u786e\u4fdd\u662f\u8fd9\u4e2a\u987a\u5e8f\uff09<\/p>\n

\n

PS\uff1a\u521d\u59cb\u5e8f\u5217\u53f7\u7531\u81ea\u5df1\u5b9a\uff0c\u800c\u540e\u7eea\u7684\u5e8f\u5217\u53f7\u7531\u5bf9\u7aef\u7684 ACK \u51b3\u5b9a\uff1aSN_x = ACK_y (x \u7684\u5e8f\u5217\u53f7 = y \u53d1\u7ed9 x \u7684 ACK)\uff0c\u8fd9\u91cc\u540e\u8fb9\u4f1a\u8bb2\u5230\u3002<\/p>\n<\/blockquote>\n

2.3 Acknowledgment Numbe<\/code><\/h3>\n
\n

\u79f0\u4e3a\u300c\u786e\u8ba4\u5e8f\u5217\u53f7\u300d\u3002\u786e\u8ba4\u5e8f\u5217\u53f7\u662f\u63a5\u6536\u786e\u8ba4\u7aef\u6240\u671f\u671b\u6536\u5230\u7684\u4e0b\u4e00\u5e8f\u5217\u53f7\u3002\u786e\u8ba4\u5e8f\u53f7\u5e94\u5f53\u662f\u4e0a\u6b21\u5df2\u6210\u529f\u6536\u5230\u6570\u636e\u5b57\u8282\u5e8f\u53f7\u52a01\uff0c\u53ea\u6709\u5f53\u6807\u5fd7\u4f4d\u4e2d\u7684 ACK \u6807\u5fd7\u4e3a 1 \u65f6\u8be5\u786e\u8ba4\u5e8f\u5217\u53f7\u7684\u5b57\u6bb5\u624d\u6709\u6548\u3002\u4e3b\u8981\u7528\u6765\u89e3\u51b3\u4e0d\u4e22\u5305\u7684\u95ee\u9898\u3002<\/p>\n<\/blockquote>\n

\u82e5\u786e\u8ba4\u53f7=N\uff0c\u5219\u8868\u660e\uff1a\u5230\u5e8f\u53f7N-1\u4e3a\u6b62\u7684\u6240\u6709\u6570\u636e\u90fd\u5df2\u6b63\u786e\u6536\u5230\u3002<\/p>\n

\u5728\u8fd9\u91cc\uff0c\u73b0\u5728\u6211\u4eec\u53ea\u9700\u77e5\u9053\u5b83\u7684\u4f5c\u7528\u662f\u4ec0\u4e48\uff0c\u5c31\u662f\u5728\u6570\u636e\u4f20\u8f93\u7684\u65f6\u5019\u662f\u4e00\u6bb5\u4e00\u6bb5\u7684\uff0c\u90fd\u662f\u7531\u5e8f\u5217\u53f7\u8fdb\u884c\u6807\u8bc6\u7684\uff0c\u6240\u4ee5\u8bf4\uff0c\u63a5\u6536\u7aef\u6bcf\u63a5\u6536\u4e00\u6bb5\uff0c\u4e4b\u540e\u5c31\u60f3\u8981\u7684\u4e0b\u4e00\u6bb5\u7684\u5e8f\u5217\u53f7\u5c31\u79f0\u4e3a\u300c\u786e\u8ba4\u5e8f\u5217\u53f7\u300d\u3002<\/p>\n

\n

\u8bf4\u660e\uff1aack\u503c\u76f8\u540c\u7684\u591a\u4e2a\u6bb5\uff0c\u8868\u793a\u662f\u5bf9\u540c\u4e00\u4e2a\u8bf7\u6c42\u7684\u54cd\u5e94\u6570\u636e\u7684\u591a\u4e2asegment\u3002\u53ea\u662f\u8fd9\u4e2a\u6570\u636e\u88ab\u5206\u5272\u6210\u4e86\u591a\u4e2asegment\u3002\u6362\u800c\u8a00\u4e4b\uff0c\u5982\u679c\u591a\u4e2a\u5305\u7684ack\u503c\u76f8\u540c\uff0c\u90a3\u4e48\u8fd9\u4e9b\u5305\u662f\u540c\u4e00\u4e2a\u6570\u636e\u5206\u5272\u6210\u7684\u591a\u4e2asegment\u3002<\/p>\n<\/blockquote>\n

2.4 TCP Flag<\/code><\/h3>\n

TCP<\/code> \u9996\u90e8\u4e2d\u6709 6 \u4e2a\u6807\u5fd7\u6bd4\u7279\uff0c\u5b83\u4eec\u4e2d\u7684\u591a\u4e2a\u53ef\u540c\u65f6\u88ab\u8bbe\u7f6e\u4e3a 1<\/code>\uff0c\u4e3b\u8981\u662f\u7528\u4e8e\u64cd\u63a7 TCP<\/code> \u7684\u72b6\u6001\u673a\u7684\uff0c\u4f9d\u6b21\u4e3aURG\uff0cACK\uff0cPSH\uff0cRST\uff0cSYN\uff0cFIN<\/code>\u3002<\/p>\n

\u4e0d\u8981\u6c42\u521d\u5b66\u8005\u5168\u90e8\u638c\u63e1\uff0c\u5728\u8fd9\u91cc\u53ea\u8bb2\u4e09\u4e2a\u91cd\u70b9\u7684\u6807\u5fd7\uff1a<\/p>\n

2.4.1 ACK<\/code><\/h4>\n

\u8fd9\u4e2a\u6807\u8bc6\u53ef\u4ee5\u7406\u89e3\u4e3a\u53d1\u9001\u7aef\u53d1\u9001\u6570\u636e\u5230\u63a5\u6536\u7aef\uff0c\u53d1\u9001\u7684\u65f6\u5019 ACK \u4e3a 0\uff0c\u6807\u8bc6\u63a5\u6536\u7aef\u8fd8\u672a\u5e94\u7b54\uff0c\u4e00\u65e6\u63a5\u6536\u7aef\u63a5\u6536\u6570\u636e\u4e4b\u540e\uff0c\u5c31\u5c06 ACK \u7f6e\u4e3a 1\uff0c\u53d1\u9001\u7aef\u63a5\u6536\u5230\u4e4b\u540e\uff0c\u5c31\u77e5\u9053\u4e86\u63a5\u6536\u7aef\u5df2\u7ecf\u63a5\u6536\u4e86\u6570\u636e\u3002<\/p>\n

\"S4htLQ-1619052731443\"<\/p>\n

\n

\u6b64\u6807\u5fd7\u8868\u793a\u300c\u5e94\u7b54\u57df\u6709\u6548\u300d\uff0c\u5c31\u662f\u8bf4\u524d\u9762\u6240\u8bf4\u7684TCP\u5e94\u7b54\u53f7\u5c06\u4f1a\u5305\u542b\u5728 TCP \u6570\u636e\u5305\u4e2d\uff1b\u6709\u4e24\u4e2a\u53d6\u503c\uff1a0 \u548c 1\uff0c\u4e3a 1 \u7684\u65f6\u5019\u8868\u793a\u5e94\u7b54\u57df\u6709\u6548\uff0c\u53cd\u4e4b\u4e3a 0\uff1b<\/p>\n<\/blockquote>\n

2.4.2 SYN<\/code><\/h4>\n
\n

\u8868\u793a\u300c\u540c\u6b65\u5e8f\u5217\u53f7\u300d\uff0c\u662f TCP \u63e1\u624b\u7684\u53d1\u9001\u7684\u7b2c\u4e00\u4e2a\u6570\u636e\u5305\u3002<\/p>\n<\/blockquote>\n

\u7528\u6765\u5efa\u7acb TCP \u7684\u8fde\u63a5\u3002SYN \u6807\u5fd7\u4f4d\u548c ACK \u6807\u5fd7\u4f4d\u642d\u914d\u4f7f\u7528\uff0c\u5f53\u8fde\u63a5\u8bf7\u6c42\u7684\u65f6\u5019SYN=1\uff0cACK=0\uff0c\u8fde\u63a5\u88ab\u54cd\u5e94\u7684\u65f6\u5019SYN=1\uff0cACK=1\uff1b\u8fd9\u4e2a\u6807\u5fd7\u7684\u6570\u636e\u5305\u7ecf\u5e38\u88ab\u7528\u6765\u8fdb\u884c\u7aef\u53e3\u626b\u63cf\u3002\u626b\u63cf\u8005\u53d1\u9001\u4e00\u4e2a\u53ea\u6709 SYN \u7684\u6570\u636e\u5305\uff0c\u5982\u679c\u5bf9\u65b9\u4e3b\u673a\u54cd\u5e94\u4e86\u4e00\u4e2a\u6570\u636e\u5305\u56de\u6765 \uff0c\u5c31\u8868\u660e\u8fd9\u53f0\u4e3b\u673a\u5b58\u5728\u8fd9\u4e2a\u7aef\u53e3\u3002\u770b\u4e0b\u9762\u52a8\u753b\uff1a
\n\"2u9kIw-1619052777028\"<\/p>\n

2.4.3 FIN<\/code><\/h4>\n
\n

\u8868\u793a\u53d1\u9001\u7aef\u5df2\u7ecf\u8fbe\u5230\u6570\u636e\u672b\u5c3e\uff0c\u4e5f\u5c31\u662f\u8bf4\u53cc\u65b9\u7684\u6570\u636e\u4f20\u9001\u5b8c\u6210\uff0c\u6ca1\u6709\u6570\u636e\u53ef\u4ee5\u4f20\u9001\u4e86\uff0c\u53d1\u9001FIN\u6807\u5fd7\u4f4d\u7684 TCP \u6570\u636e\u5305\u540e\uff0c\u8fde\u63a5\u5c06\u88ab\u65ad\u5f00\u3002\u8fd9\u4e2a\u6807\u5fd7\u7684\u6570\u636e\u5305\u4e5f\u7ecf\u5e38\u88ab\u7528\u4e8e\u8fdb\u884c\u7aef\u53e3\u626b\u63cf\u3002<\/p>\n<\/blockquote>\n

\u8fd9\u4e2a\u5f88\u597d\u7406\u89e3\uff0c\u5c31\u662f\u8bf4\uff0c\u53d1\u9001\u7aef\u53ea\u5269\u6700\u540e\u7684\u4e00\u6bb5\u6570\u636e\u4e86\uff0c\u540c\u65f6\u8981\u544a\u8bc9\u63a5\u6536\u7aef\u540e\u8fb9\u6ca1\u6709\u6570\u636e\u53ef\u4ee5\u63a5\u53d7\u4e86\uff0c\u6240\u4ee5\u7528FIN\u6807\u8bc6\u4e00\u4e0b\uff0c\u63a5\u6536\u7aef\u770b\u5230\u8fd9\u4e2aFIN\u4e4b\u540e\uff0c\u54e6\uff01\u8fd9\u662f\u63a5\u53d7\u7684\u6700\u540e\u7684\u6570\u636e\uff0c\u63a5\u53d7\u5b8c\u5c31\u5173\u95ed\u4e86\u3002\u52a8\u753b\u5982\u4e0b\uff1a<\/p>\n

\"cEzw0i-1619052809183\"<\/p>\n

\u5176\u4ed6<\/h4>\n

\u804a\u4e00\u804aTCP\u534f\u8bae\u4e2d\u7684tcp push\u6807\u5fd7\u4f4d<\/a><\/p>\n

2.5 Window size<\/code><\/h3>\n

\u79f0\u4e3a\u6ed1\u52a8\u7a97\u53e3\u5927\u5c0f\u3002\u6240\u8bf4\u7684\u6ed1\u52a8\u7a97\u53e3\uff0c\u7528\u6765\u8fdb\u884c\u6d41\u91cf\u63a7\u5236\u3002<\/p>\n

\u4e09\u3001\u4e3a\u4ec0\u4e48\u8fdb\u884c TCP \u4e09\u6b21\u63e1\u624b\uff1f<\/h2>\n

\u7b2c\u4e00\uff0c\u4e3a\u4e86\u786e\u8ba4\u53cc\u65b9\u7684\u63a5\u6536\u4e0e\u53d1\u9001\u80fd\u529b\u662f\u5426\u6b63\u5e38\u3002(\u91cd\u70b9\uff1a\u53cc\u65b9\u3001\u53cc\u5411)<\/p>\n

\u7b2c\u4e8c\uff0c\u6307\u5b9a\u81ea\u5df1\u7684\u521d\u59cb\u5316\u5e8f\u5217\u53f7\uff0c\u4e3a\u540e\u9762\u7684\u53ef\u9760\u4f20\u9001\u505a\u51c6\u5907\u3002<\/p>\n

\u7b2c\u4e09\uff0c\u5982\u679c\u662f https \u534f\u8bae\u7684\u8bdd\uff0c\u4e09\u6b21\u63e1\u624b\u8fd9\u4e2a\u8fc7\u7a0b\uff0c\u8fd8\u4f1a\u8fdb\u884c\u6570\u5b57\u8bc1\u4e66\u7684\u9a8c\u8bc1\u4ee5\u53ca\u52a0\u5bc6\u5bc6\u94a5\u7684\u751f\u6210\u5230\u3002<\/p>\n

\u5982\u679c\u4f60\u4e86\u89e3 UDP \u7684\u8bdd\uff0cTCP \u7684\u51fa\u73b0\u6b63\u5f0f\u5f25\u8865\u4e86 UDP \u4e0d\u53ef\u9760\u4f20\u8f93\u7684\u7f3a\u70b9\u3002\u4f46\u662f TCP \u7684\u8bde\u751f\uff0c\u4e5f\u5fc5\u7136\u589e\u52a0\u4e86\u8fde\u63a5\u7684\u590d\u6742\u6027\u3002<\/p>\n

\u56db\u3001TCP \u4e09\u6b21\u63e1\u624b\u8fc7\u7a0b\uff1f<\/h2>\n

TCP \u4e09\u6b21\u63e1\u624b\u7684\u8fc7\u7a0b\u638c\u63e1\u6700\u91cd\u8981\u7684\u4e24\u70b9\u5c31\u662f\u5ba2\u6237\u7aef\u548c\u670d\u52a1\u7aef\u72b6\u6001\u7684\u53d8\u5316\uff0c\u53e6\u4e00\u4e2a\u662f\u4e09\u6b21\u63e1\u624b\u8fc7\u7a0b\u6807\u5fd7\u4fe1\u606f\u7684\u53d8\u5316\uff0c\u90a3\u4e48\u638c\u63e1 TCP \u7684\u4e09\u6b21\u63e1\u624b\u5c31\u7b80\u5355\u591a\u4e86\u3002\u4e0b\u9762\u6211\u4eec\u5c31\u4ee5\u52a8\u753b\u5f62\u5f0f\u8fdb\u884c\u62c6\u89e3\u4e09\u6b21\u63e1\u624b\u8fc7\u7a0b\u3002<\/p>\n

\"ZC2GT9-1619052928922\"<\/p>\n

    \n
  • \u521d\u59cb\u72b6\u6001<\/strong>\uff1a\u5ba2\u6237\u7aef\u5904\u4e8e closed(\u5173\u95ed)<\/code>\u72b6\u6001\uff0c\u670d\u52a1\u5668\u5904\u4e8e listen(\u76d1\u542c)<\/code> \u72b6\u6001\u3002<\/li>\n<\/ul>\n

    \"cJGdu5-1619052951651\"<\/p>\n

      \n
    • \u7b2c\u4e00\u6b21\u63e1\u624b<\/strong>\uff1a\u5ba2\u6237\u7aef\u53d1\u9001\u8bf7\u6c42\u62a5\u6587\u5c06 SYN = 1<\/code>\u540c\u6b65\u5e8f\u5217\u53f7\u548c\u521d\u59cb\u5316\u5e8f\u5217\u53f7seq = x<\/code>\u53d1\u9001\u7ed9\u670d\u52a1\u7aef\uff0c\u53d1\u9001\u5b8c\u4e4b\u540e\u5ba2\u6237\u7aef\u5904\u4e8eSYN_Send<\/code>\u72b6\u6001\u3002<\/li>\n<\/ul>\n

      \"VnoEPM-1619052975453\"<\/p>\n

        \n
      • \u7b2c\u4e8c\u6b21\u63e1\u624b<\/strong>\uff1a\u670d\u52a1\u7aef\u53d7\u5230 SYN<\/code> \u8bf7\u6c42\u62a5\u6587\u4e4b\u540e\uff0c\u5982\u679c\u540c\u610f\u8fde\u63a5\uff0c\u4f1a\u4ee5\u81ea\u5df1\u7684\u540c\u6b65\u5e8f\u5217\u53f7SYN(\u670d\u52a1\u7aef) = 1<\/code>\u3001\u521d\u59cb\u5316\u5e8f\u5217\u53f7 seq = y<\/code>\u548c\u786e\u8ba4\u5e8f\u5217\u53f7\uff08\u671f\u671b\u4e0b\u6b21\u6536\u5230\u7684\u6570\u636e\u5305\uff09ack = x+ 1<\/code> \u4ee5\u53ca\u786e\u8ba4\u53f7ACK = 1<\/code>\u62a5\u6587\u4f5c\u4e3a\u5e94\u7b54\uff0c\u670d\u52a1\u5668\u4e3aSYN_Receive<\/code>\u72b6\u6001\u3002<\/li>\n<\/ul>\n

        \"HCCY77-1619052994509\"<\/p>\n

          \n
        • \u7b2c\u4e09\u6b21\u63e1\u624b<\/strong>\uff1a \u5ba2\u6237\u7aef\u63a5\u6536\u5230\u670d\u52a1\u7aef\u7684 SYN + ACK<\/code>\u4e4b\u540e\uff0c\u77e5\u9053\u53ef\u4ee5\u4e0b\u6b21\u53ef\u4ee5\u53d1\u9001\u4e86\u4e0b\u4e00\u5e8f\u5217\u7684\u6570\u636e\u5305\u4e86\uff0c\u7136\u540e\u53d1\u9001\u540c\u6b65\u5e8f\u5217\u53f7 ack = y + 1<\/code>\u548c\u6570\u636e\u5305\u7684\u5e8f\u5217\u53f7 seq = x + 1<\/code>\u4ee5\u53ca\u786e\u8ba4\u53f7ACK = 1<\/code>\u786e\u8ba4\u5305\u4f5c\u4e3a\u5e94\u7b54\uff0c\u5ba2\u6237\u7aef\u8f6c\u4e3aestablished<\/code>\u72b6\u6001\u3002<\/li>\n<\/ul>\n

          \"0fDqPh-1619053010805\"<\/p>\n

          \u4e94\u3001\u4e3a\u4ec0\u4e48\u4e0d\u662f\u4e00\u6b21\u3001\u4e8c\u6b21\u63e1\u624b\uff1f<\/h2>\n
          \n

          \u9632\u6b62\u4e86\u670d\u52a1\u5668\u7aef\u7684\u4e00\u76f4\u7b49\u5f85\u800c\u6d6a\u8d39\u8d44\u6e90\u3002<\/p>\n<\/blockquote>\n

          \u4e3a\u4e86\u9632\u6b62\u5df2\u5931\u6548\u7684\u8fde\u63a5\u8bf7\u6c42\u62a5\u6587\u6bb5\u7a81\u7136\u53c8\u4f20\u9001\u5230\u4e86\u670d\u52a1\u7aef\uff0c\u56e0\u800c\u4ea7\u751f\u9519\u8bef\u3002\u5982\u679c\u6b64\u65f6\u5ba2\u6237\u7aef\u53d1\u9001\u7684\u5ef6\u8fdf\u7684\u63e1\u624b\u4fe1\u606f\u670d\u52a1\u5668\u6536\u5230\uff0c\u7136\u540e\u670d\u52a1\u5668\u8fdb\u884c\u54cd\u5e94\uff0c\u8ba4\u4e3a\u5ba2\u6237\u7aef\u8981\u548c\u5b83\u5efa\u7acb\u8fde\u63a5\uff0c\u6b64\u65f6\u5ba2\u6237\u7aef\u5e76\u6ca1\u6709\u8fd9\u4e2a\u610f\u601d\uff0c\u4f46 server \u5374\u4ee5\u4e3a\u65b0\u7684\u8fd0\u8f93\u8fde\u63a5\u5df2\u7ecf\u5efa\u7acb\uff0c\u5e76\u4e00\u76f4\u7b49\u5f85 client \u53d1\u6765\u6570\u636e\u3002\u8fd9\u6837\uff0cserver \u7684\u5f88\u591a\u8d44\u6e90\u5c31\u767d\u767d\u6d6a\u8d39\u6389\u4e86\u3002<\/p>\n

          \n

          \u5728\u8c22\u5e0c\u4ec1\u8457\u300a\u8ba1\u7b97\u673a\u7f51\u7edc\u300b\u7b2c\u56db\u7248\u4e2d\u8bb2\u201c\u4e09\u6b21\u63e1\u624b\u201d\u7684\u76ee\u7684\u662f\u201c\u4e3a\u4e86\u9632\u6b62\u5df2\u5931\u6548\u7684\u8fde\u63a5\u8bf7\u6c42\u62a5\u6587\u6bb5\u7a81\u7136\u53c8\u4f20\u9001\u5230\u4e86\u670d\u52a1\u7aef\uff0c\u56e0\u800c\u4ea7\u751f\u9519\u8bef\u201d\u3002<\/p>\n<\/blockquote>\n

          \u4e3e\u4e2a\u7b80\u5355\u6613\u61c2\u7684\u4f8b\u5b50\uff0c\u4f60\u5728\u5fae\u4fe1\u5bf9\u4e00\u4e2a\u5973\u5b69\u8868\u767d\uff0c\u8fd9\u6761\u4fe1\u606f\u7531\u4e8e\u7f51\u7edc\u95ee\u9898\u5ef6\u8fdf\u53d1\u9001\u4e86\u3002<\/p>\n

          \"4i9iX4-1619053219120\"<\/p>\n

          \u7136\u540e\u6b64\u65f6\u4f60\u4e0d\u8010\u70e6\u4e86\uff0c\u53bb\u548c\u5fae\u4fe1\u53e6\u4e00\u4e2a\u5973\u5b69\u8868\u767d\uff0c\u7136\u540e\u53e6\u4e00\u4e2a\u5973\u5b69\u544a\u8bc9\u4f60\u540c\u610f\u4e86\uff0c\u7136\u540e\u4f60\u5fc3\u91cc\u5f88\u9ad8\u5174\uff0c\u628a\u9ad8\u5174\u7684\u5fc3\u60c5\u5206\u4eab\u7ed9\u4e86\u5973\u5b69\uff0c\u5973\u5b69\u77e5\u9053\u4e86\u4f60\u548c\u5979\u5728\u4e00\u8d77\u5f88\u9ad8\u5174\uff0c\u6b64\u65f6\u4e09\u6b21\u63e1\u5b8c\u6bd5\uff0c\u4f60\u604b\u7231\u4e86\u3002<\/p>\n

          \"E96wMQ-1619053236690\"<\/p>\n

          \u7a81\u7136\uff0c\u5230\u4e86\u7b2c\u4e8c\u5929\uff0c\u53d1\u7ed9\u7b2c\u4e00\u4e2a\u5973\u5b69\u7684\u4fe1\u606f\u624d\u6536\u5230\uff0c\u5973\u5b69\u8ba4\u4e3a\u4f60\u8981\u548c\u4ed6\u8868\u767d\uff0c\u6b64\u65f6\u4f60\u5df2\u7ecf\u548c\u53e6\u4e00\u4e2a\u5973\u5b69\u604b\u7231\u4e86\uff0c\u7136\u540e\u7b2c\u4e00\u4e2a\u5973\u5b69\u7ed9\u4f60\u53d1\u5fae\u4fe1\u540c\u610f\u4e86\u4f60\u7684\u8868\u767d\uff0c\u4f46\u662f\u4f60\u4e0d\u7406\u776c\uff0c\u90a3\u4e2a\u5973\u5b69\u8fd8\u5728\u82e6\u82e6\u7b49\u5f85\u4f60\u7ed9\u5979\u5206\u4eab\u6b64\u65f6\u7684\u9ad8\u5174\u5fc3\u60c5\u3002\u73b0\u5728\u6211\u4eec\u53d1\u73b0\u5982\u679c\u6ca1\u6709\u5206\u4eab\u9ad8\u5174\u7684\u5fc3\u60c5\u7ed9\u5973\u5b69\uff08\u4e5f\u5c31\u662f\u7b2c\u4e09\u6b21\u63e1\u624b\u8fc7\u7a0b\uff09\uff0c\u90a3\u4e48\u90a3\u4e2a\u5973\u5b69\u4e00\u76f4\u7b49\u5f85\uff0c\u767d\u767d\u6d6a\u8d39\u4e86\u5fc3\u601d\uff0c\u6240\u8c13\u7684\u5343\u5e74\u90fd\u7b49\u4e0d\u4e86\u4e00\u56de\u3002<\/p>\n

          \"PTT8xq-1619053266562\"<\/p>\n

          \u5982\u679c\u4f60\u662f\u5ba2\u6237\u7aef\uff0c\u5973\u5b69\u662f\u670d\u52a1\u7aef\uff0c\u670d\u52a1\u7aef\u6536\u5230\u5ef6\u8fdf\u7684\u62a5\u6587\uff0c\u4ee5\u4e3a\u4f60\u8981\u548c\u5b83\u8fde\u63a5\uff0c\u6240\u4ee5\u4f1a\u7ed9\u4f60\u53d1\u9001\u786e\u8ba4\u540c\u610f\u8fde\u63a5\uff0c\u4f46\u4f60\u4e00\u76f4\u4e0d\u642d\u7406\u5b83\uff0c\u6240\u4ee5\u670d\u52a1\u7aef\u7684\u8d44\u6e90\u4e5f\u5c31\u8fd9\u4e48\u767d\u767d\u6d6a\u8d39\u6389\u4e86\u3002\u6240\u4ee5\u77e5\u9053\u4e3a\u4ec0\u4e48\u8981\u8fdb\u884c\u4e09\u6b21\u63e1\u624b\u4e86\u5427\u3002<\/p>\n

          \n

          \u5728\u300a\u8ba1\u7b97\u673a\u7f51\u7edc\u300b\u4e66\u4e2d\u8bb2\u201c\u4e09\u6b21\u63e1\u624b\u201d\u7684\u76ee\u7684\u662f\u4e3a\u4e86\u89e3\u51b3\u201c\u7f51\u7edc\u4e2d\u5b58\u5728\u5ef6\u8fdf\u7684\u91cd\u590d\u5206\u7ec4\u201d\u7684\u95ee\u9898\u3002<\/p>\n<\/blockquote>\n

          \u516d\u3001\u4e3a\u4ec0\u4e48\u8981 TCP \u56db\u6b21\u5206\u624b\uff1f<\/h2>\n

          \u6211\u4eec\u77e5\u9053\uff0cTCP\u534f\u8bae\u662f\u4e00\u79cd\u9762\u5411\u8fde\u63a5\u7684\u3001\u53ef\u9760\u7684\u3001\u57fa\u4e8e\u5b57\u8282\u6d41\u7684\u8fd0\u8f93\u5c42\u901a\u4fe1\u534f\u8bae\uff0c\u800c\u4e14TCP\u662f\u5168\u53cc\u5de5\u6a21\u5f0f\u3002<\/p>\n

          \u5bf9\u4e8e\u521d\u5b66\u8005\u6765\u8bf4\uff0c\u5b9a\u4e49\u592a\u67af\u71e5\u3001\u65e0\u5473\uff0c\u5176\u5b9e\u610f\u601d\u5c31\u662f\u4f60\u548c\u4f60\u5973\u670b\u53cb\u804a\u5929\u662f\u9762\u5411\u8fde\u63a5\u7684\uff0c\u53ea\u6709\u8fde\u63a5\u8d77\u6765\u624d\u53ef\u4ee5\u901a\u4fe1\u7684\uff0c\u53ef\u9760\u5c31\u662f\u4f60\u53d1\u9001\u7684\u4fe1\u606f\u53ef\u4ee5\u4fdd\u8bc1\u9001\u8fbe\u5230\u5bf9\u65b9\uff0c\u5168\u53cc\u5de5\u610f\u601d\u5c31\u662f\u4f60\u4e0d\u4ec5\u53ef\u4ee5\u7ed9\u4f60\u5973\u670b\u53cb\u53d1\u6d88\u606f\uff0c\u800c\u4e14\u5979\u4e5f\u53ef\u4ee5\u7ed9\u4f60\u53d1\u4fe1\u606f\u3002<\/p>\n

          \u4e3a\u4ec0\u4e48\u975e\u8981\u8fdb\u884c TCP \u56db\u6b21\u5206\u624b\uff1f\u6211\u4eec\u63a5\u7740\u4e0a\u56de\u8bf4\u5230\uff0c\u4f60\u73b0\u5728\u548c\u7b2c\u4e8c\u4e2a\u5973\u5b69\u5b50\u604b\u7231\u4e86\uff0c\u7a81\u7136\u6709\u4e00\u5929\u53d1\u73b0\u7b2c\u4e00\u4e2a\u5973\u5b69\u5b50\u662f\u56e0\u4e3a\u6ca1\u6709\u6536\u5230\u4f60\u7684\u8868\u767d\u800c\u9519\u8fc7\u4e86\u5728\u4e00\u8d77\u7684\u65f6\u673a\uff0c\u90a3\u4e48\u4f60\u8981\u548c\u7b2c\u4e8c\u4e2a\u5973\u5b69\u5b50\u5206\u624b\uff0c\u90a3\u8fc7\u7a0b\u5bf9\u5e94\u5728 TCP \u56db\u6b21\u5206\u624b\u662f\u600e\u4e48\u6837\u5b50\u7684\uff1f
          \n\"k8ZFeD-1619053935696\"<\/p>\n

          \u4f60\u8981\u7ed9\u7b2c\u4e8c\u4e2a\u5973\u5b69\u5b50\u5fae\u4fe1\u53d1\u6d88\u606f\uff0c\u6211\u4eec\u5206\u624b\u5427\uff0c\u6b64\u65f6\u7b2c\u4e8c\u4e2a\u5973\u5b69\u5b50\u6536\u5230\u6d88\u606f\u77e5\u9053\u4e86\uff0c\u975e\u5e38\u4f24\u5fc3\uff0c\u5c31\u5c4f\u853d\u4e86\u4f60\u3002\u4f46\u662f\uff0c\u6b64\u65f6\u4f60\u8fd8\u6ca1\u6709\u5c4f\u853d\u5979\uff0c\u5979\u5b8c\u5168\u53ef\u4ee5\u7ed9\u4f60\u7ee7\u7eed\u53d1\u6d88\u606f\uff0c\u5979\u7ed9\u4f60\u53d1\u6d88\u606f\u8bf4\uff0c\u597d\u5427\uff0c\u6b64\u65f6\u4f60\u6536\u5230\u4e86\u786e\u8ba4\u6d88\u606f\uff0c\u6b64\u65f6\u662f\u7b2c\u4e8c\u6b21\u5206\u624b\u8fc7\u7a0b\u3002\u90a3\u4e48\u5973\u5b69\u53c8\u7ed9\u4f60\u53d1\u9001\u6d88\u606f\uff0c\u6e23\u7537\uff0c\u6c38\u8fdc\u4e0d\u8981\u6765\u627e\u6211\u3002\u6b64\u65f6\u4f60\u53c8\u63a5\u6536\u5230\u6d88\u606f\uff0c\u770b\u5230\u6d88\u606f\u4e4b\u540e\u53d1\u4e86\u4e00\u4e2a\u62dc\u62dc\uff0c\u7136\u540e\u4f60\u5c31\u76f4\u63a5\u5c4f\u853d\u62c9\u9ed1\u4e86\u5bf9\u65b9\uff0c\u6b64\u65f6\u5973\u5b69\u5fae\u4fe1\u663e\u793a\u4f60\u5220\u9664\u4e86\u5bf9\u65b9\uff0c\u7136\u540e\u5c31\u628a\u4f60\u4e5f\u62c9\u9ed1\u5220\u9664\u4e86\u3002\u90a3\u4e48\u56db\u6b21\u5206\u624b\u5230\u6b64\u4e3a\u6b62\uff0c\u606d\u559c\u4f60\uff0c\u6210\u529f\u83b7\u5f97\u4e0b\u4e00\u4e2a\u5973\u5b69\u5b50\u3002<\/p>\n

          \u4e0a\u8ff0\u8fc7\u7a0b\u5c31\u9610\u8ff0\u4e86\u4e3a\u4ec0\u4e48\u8981\u8fdb\u884c TCP \u56db\u6b21\u5206\u624b\uff0c\u4e3a\u4e86\u80fd\u591f\u8ba9\u5bf9\u65b9\u5c4f\u853d\u4f60\u76f4\u81f3\u6700\u540e\u53cc\u65b9\u4e92\u76f8\u5220\u9664\u6389\uff0c\u7136\u540e\u4f60\u53c8\u53ef\u4ee5\u548c\u53e6\u4e00\u4e2a\u5973\u5b69\u4e09\u6b21\u63e1\u624b\u4e86\u3002<\/p>\n

          \u4e03\u3001TCP \u56db\u6b21\u5206\u624b\u8fc7\u7a0b<\/h2>\n

          \u521d\u59cb\u5316\u72b6\u6001\uff1a\u5ba2\u6237\u7aef\u548c\u670d\u52a1\u7aef\u90fd\u5728\u8fde\u63a5\u72b6\u6001\uff0c\u63a5\u4e0b\u6765\u5f00\u59cb\u8fdb\u884c\u56db\u6b21\u5206\u624b\u65ad\u5f00\u8fde\u63a5\u64cd\u4f5c\u3002<\/p>\n

          \"JOtmge-1619053974942\"<\/p>\n

            \n
          • \u7b2c\u4e00\u6b21\u5206\u624b\uff1a\u7b2c\u4e00\u6b21\u5206\u624b\u65e0\u8bba\u662f\u5ba2\u6237\u7aef\u8fd8\u662f\u670d\u52a1\u7aef\u90fd\u53ef\u4ee5\u53d1\u8d77\uff0c\u56e0\u4e3a TCP \u662f\u5168\u53cc\u5de5\u7684\u3002<\/li>\n<\/ul>\n
            \n

            \u5047\u5982\u5ba2\u6237\u7aef\u53d1\u9001\u7684\u6570\u636e\u5df2\u7ecf\u53d1\u9001\u5b8c\u6bd5\uff0c\u53d1\u9001FIN = 1 \u544a\u8bc9\u670d\u52a1\u7aef\uff0c\u5ba2\u6237\u7aef\u6240\u6709\u6570\u636e\u5df2\u7ecf\u5168\u53d1\u5b8c\u4e86\uff0c\u670d\u52a1\u7aef\u4f60\u53ef\u4ee5\u5173\u95ed\u63a5\u6536\u4e86\uff0c\u4f46\u662f\u5982\u679c\u4f60\u4eec\u670d\u52a1\u7aef\u6709\u6570\u636e\u8981\u53d1\u7ed9\u5ba2\u6237\u7aef\uff0c\u5ba2\u6237\u7aef\u7167\u6837\u53ef\u4ee5\u63a5\u6536\u7684\u3002\u6b64\u65f6\u5ba2\u6237\u7aef\u5904\u4e8eFIN = 1\u7b49\u5f85\u670d\u52a1\u7aef\u786e\u8ba4\u91ca\u653e\u8fde\u63a5\u72b6\u6001\u3002<\/p>\n<\/blockquote>\n

            \"xBSWUU-1619054001828\"<\/p>\n

              \n
            • \u7b2c\u4e8c\u6b21\u5206\u624b\uff1a\u670d\u52a1\u7aef\u63a5\u6536\u5230\u5ba2\u6237\u7aef\u7684\u91ca\u653e\u8bf7\u6c42\u8fde\u63a5\u4e4b\u540e\uff0c\u77e5\u9053\u5ba2\u6237\u7aef\u6ca1\u6709\u6570\u636e\u8981\u53d1\u7ed9\u81ea\u5df1\u4e86\uff0c\u7136\u540e\u670d\u52a1\u7aef\u53d1\u9001ACK = 1\u544a\u8bc9\u5ba2\u6237\u7aef\u53d7\u5230\u4f60\u53d1\u7ed9\u6211\u7684\u4fe1\u606f\uff0c\u6b64\u65f6\u670d\u52a1\u7aef\u5904\u4e8e CLOSE_WAIT \u7b49\u5f85\u5173\u95ed\u72b6\u6001\u3002<\/li>\n<\/ul>\n

              \"qAagzX-1619054017252\"<\/p>\n

                \n
              • \u7b2c\u4e09\u6b21\u5206\u624b\uff1a\u6b64\u65f6\u670d\u52a1\u7aef\u5411\u5ba2\u6237\u7aef\u628a\u6240\u6709\u7684\u6570\u636e\u53d1\u9001\u5b8c\u4e86\uff0c\u7136\u540e\u53d1\u9001\u4e00\u4e2aFIN = 1\uff0c\u7528\u4e8e\u544a\u8bc9\u5ba2\u6237\u7aef\uff0c\u670d\u52a1\u7aef\u7684\u6240\u6709\u6570\u636e\u53d1\u9001\u5b8c\u6bd5\uff0c\u5ba2\u6237\u7aef\u4f60\u4e5f\u53ef\u4ee5\u5173\u95ed\u63a5\u53d7\u6570\u636e\u8fde\u63a5\u4e86\u3002\u6b64\u65f6\u670d\u52a1\u7aef\u72b6\u6001\u5904\u4e8eLAT_ACK\u72b6\u6001\uff0c\u6765\u7b49\u5f85\u786e\u8ba4\u5ba2\u6237\u7aef\u662f\u5426\u6536\u5230\u4e86\u81ea\u5df1\u7684\u8bf7\u6c42\u3002<\/li>\n<\/ul>\n

                \"rZ8vRt-1619054034390\"<\/p>\n

                  \n
                • \u7b2c\u56db\u6b21\u5206\u624b\uff1a\u6b64\u65f6\u5982\u679c\u5ba2\u6237\u7aef\u6536\u5230\u4e86\u670d\u52a1\u7aef\u53d1\u9001\u5b8c\u7684\u4fe1\u606f\u4e4b\u540e\uff0c\u5c31\u53d1\u9001ACK = 1\uff0c\u544a\u8bc9\u670d\u52a1\u7aef\uff0c\u5ba2\u6237\u7aef\u5df2\u7ecf\u6536\u5230\u4e86\u4f60\u7684\u4fe1\u606f\u3002\u4f46\u662f\u6211\u4eec\u53d1\u73b0\u4e0a\u56fe\u4e2d\u6709\u4e00\u4e2a 2 MSL \u7684\u5ef6\u8fdf\u7b49\u5f85\u3002<\/li>\n<\/ul>\n

                  \"1aXSNt-1619054049074\"<\/p>\n

                  \u516b\u3001\u4e3a\u4ec0\u8981\u6709 2 MSL \u7b49\u5f85\u5ef6\u8fdf\uff1f<\/h2>\n

                  \u5bf9\u5e94\u8fd9\u6837\u4e00\u79cd\u60c5\u51b5\uff0c\u6700\u540e\u5ba2\u6237\u7aef\u53d1\u9001\u7684ACK = 1\u7ed9\u670d\u52a1\u7aef\u7684\u8fc7\u7a0b\u4e2d\u4e22\u5931\u4e86\uff0c\u670d\u52a1\u7aef\u6ca1\u6536\u5230\uff0c\u670d\u52a1\u7aef\u600e\u4e48\u8ba4\u4e3a\u7684\uff1f\u6211\u5df2\u7ecf\u53d1\u9001\u5b8c\u6570\u636e\u4e86\uff0c\u600e\u4e48\u5ba2\u6237\u7aef\u6ca1\u56de\u5e94\u6211\uff1f\u662f\u4e0d\u662f\u4e2d\u9014\u4e22\u5931\u4e86\uff1f\u7136\u540e\u670d\u52a1\u7aef\u518d\u6b21\u53d1\u8d77\u65ad\u5f00\u8fde\u63a5\u7684\u8bf7\u6c42\uff0c\u4e00\u4e2a\u6765\u56de\u5c31\u662f2MSL\uff0c\u8fd9\u91cc\u7684\u4e24\u4e2a\u6765\u56de\u7531\u90a3\u4e00\u4e2a\u6765\u56de\u7ec4\u6210\u7684\uff1f<\/p>\n

                  \u5ba2\u6237\u7aef\u7ed9\u670d\u52a1\u7aef\u53d1\u9001\u7684ACK = 1\u4e22\u5931\uff0c\u670d\u52a1\u7aef\u7b49\u5f85 1MSL\u6ca1\u6536\u5230\uff0c\u7136\u540e\u91cd\u65b0\u53d1\u9001\u6d88\u606f\u9700\u89811MSL\u3002\u5982\u679c\u518d\u6b21\u63a5\u6536\u5230\u670d\u52a1\u7aef\u7684\u6d88\u606f\uff0c\u5219\u91cd\u542f2MSL\u8ba1\u65f6\u5668\uff0c\u53d1\u9001\u786e\u8ba4\u8bf7\u6c42\u3002\u5ba2\u6237\u7aef\u53ea\u9700\u7b49\u5f852MSL\uff0c\u5982\u679c\u6ca1\u6709\u518d\u6b21\u6536\u5230\u670d\u52a1\u7aef\u7684\u6d88\u606f\uff0c\u5c31\u8bf4\u660e\u670d\u52a1\u7aef\u5df2\u7ecf\u63a5\u6536\u5230\u81ea\u5df1\u786e\u8ba4\u6d88\u606f\uff1b\u6b64\u65f6\u53cc\u65b9\u90fd\u5173\u95ed\u7684\u8fde\u63a5\uff0cTCP \u56db\u6b21\u5206\u624b\u5b8c\u6bd5\u3002<\/p>\n

                  \u4e5d\u3001\u5982\u679c\u53cc\u65b9\u5efa\u7acb\u8fde\u63a5\uff0c\u4e00\u65b9\u51fa\u95ee\u9898\u600e\u4e48\u529e\uff1f<\/h2>\n

                  \u5982\u679c\u53cc\u65b9\u5efa\u7acb\u8fde\u63a5\uff0c\u4e00\u65b9\u51fa\u95ee\u9898\u600e\u4e48\u529e\uff1f\u4e3a\u4e86\u9632\u6b62\u51fa\u73b0\u4e0a\u8ff0\u604b\u7231\u6545\u4e8b\u4e2d\u5343\u5e74\u7b49\u4e00\u56de\u7684\u60c5\u51b5\uff0c\u5df2\u7ecf\u5efa\u7acb\u8fde\u63a5\uff0c\u4f46\u662f\u670d\u52a1\u7aef\u4e00\u76f4\u7b49\u5f85\u63a5\u6536\uff0c\u53d1\u9001\u7aef\u51fa\u73b0\u95ee\u9898\u4e00\u76f4\u4e0d\u80fd\u53d1\u9001\u3002<\/p>\n

                  \u6240\u4ee5\u8bbe\u8ba1\u4e00\u4e2a\u4fdd\u6d3b\u7684\u8ba1\u65f6\u5668\uff0c\u5982\u679c\u4e00\u65b9\u51fa\u73b0\u95ee\u9898\uff0c\u53e6\u4e00\u65b9\u8fc7\u4e86\u8fd9\u4e2a\u8ba1\u65f6\u5668\u7684\u65f6\u95f4\uff0c\u5c31\u53d1\u9001\u8bd5\u63a2\u62a5\u6587\uff0c\u4ee5\u540e\u6bcf\u9694 75 \u79d2\u53d1\u9001\u4e00\u6b21\u3002\u82e5\u4e00\u8fde\u53d1\u900110\u4e2a\u63a2\u6d4b\u62a5\u6587\u4ecd\u7136\u6ca1\u53cd\u5e94\uff0c\u670d\u52a1\u5668\u5c31\u8ba4\u4e3a\u5ba2\u6237\u7aef\u51fa\u4e86\u6545\u969c\uff0c\u63a5\u7740\u5c31\u5173\u95ed\u8fde\u63a5\u3002<\/p>\n

                  \u5341\u3001\u5c0f\u7ed3<\/h2>\n

                  \u4eca\u5929\u7528\u52a8\u753b\u7684\u5f62\u5f0f\u7ed9\u4f60\u5973\uff08\u7537\uff09\u670b\u53cb\u8bb2\u4e86 TCP \u56db\u6b21\u5206\u624b\u7684\u8fc7\u7a0b\uff0c\u6587\u7ae0\u7684\u5185\u5bb9\u4ee5\u53ca\u5c55\u73b0\u5f62\u5f0f\u662f\u6700\u57fa\u7840\u7684\u5185\u5bb9\u3002<\/p>\n

                  \u6700\u540e\u5c0f\u9e7f\u4e3a\u5927\u5bb6\u6574\u7406\u7684\u4e09\u6b21\u63e1\u624b\u548c\u56db\u6b21\u5206\u624b\u6574\u5f20\u56fe\uff0c\u5982\u4e0b\uff1a
                  \n\"Dh4Gtx-1619054111097\"<\/p>\n","protected":false},"excerpt":{"rendered":"

                  \u8f6c\u8f7d\u58f0\u660e \u52a8\u753b\uff1a\u7528\u52a8\u753b\u7ed9\u9762\u8bd5\u5b98\u89e3\u91ca TCP \u4e09\u6b21\u63e1\u624b\u8fc7\u7a0b \u52a8\u753b\uff1a\u7528\u52a8\u753b\u7ed9\u5973\u670b\u53cb\u8bb2\u89e3 TCP \u56db\u6b21\u5206\u624b\u8fc7\u7a0b \u4e00\u3001<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[17],"tags":[93],"yoast_head":"\nTCP\u4e09\u6b21\u63e1\u624b\u4e0e\u56db\u6b21\u6325\u624b\u8be6\u89e3[\u52a8\u753b] - Linux\u81ea\u52a8\u5316\u8fd0\u7ef4<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.linuxdevops.cn\/2021\/04\/detailed-explanation-of-tcp-three-handshakes-and-four-waves\/\" \/>\n<meta property=\"og:locale\" content=\"zh_CN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"TCP\u4e09\u6b21\u63e1\u624b\u4e0e\u56db\u6b21\u6325\u624b\u8be6\u89e3[\u52a8\u753b] - 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