{"id":5629,"date":"2022-01-09T01:36:01","date_gmt":"2022-01-09T09:36:01","guid":{"rendered":"https:\/\/www.xh86.me\/?p=5629"},"modified":"2022-01-09T02:16:58","modified_gmt":"2022-01-09T10:16:58","slug":"wireshark%e6%8a%93%e5%8c%85%e6%8a%a5%e6%96%87%e7%bb%93%e6%9e%84%e5%88%86%e6%9e%90","status":"publish","type":"post","link":"https:\/\/www.xh86.me\/?p=5629","title":{"rendered":"WireShark\u6293\u5305\u62a5\u6587\u7ed3\u6784\u5206\u6790"},"content":{"rendered":"
\n

TCP<\/span>\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\u7531IETF\u7684RFC 793\u5b9a\u4e49TCP\u5c42\u662f\u4f4d\u4e8eIP\u5c42\u4e4b\u4e0a\uff0c\u5e94\u7528\u5c42\u4e4b\u4e0b\u7684\u4e2d\u95f4\u5c42\u3002\u4e0d\u540c\u4e3b\u673a\u7684\u5e94\u7528\u5c42\u4e4b\u95f4\u7ecf\u5e38\u9700\u8981\u53ef\u9760\u7684\u3001\u50cf\u7ba1\u9053\u4e00\u6837\u7684\u8fde\u63a5\u3002<\/span><\/p>\n

<\/div><\/p>\n

\uff08\u56fe\u7247\u6765\u6e90\u4e8e\u7f51\u7edc\uff09<\/span><\/p>\n

\u4e3a\u4e86\u89e3\u62a5\u6587\u7ed3\u6784\uff0c\u6211\u5c31\u628a\u4e0a\u6b21\u6293\u7684Telnet\u7684\u62a5\u6587\u62ff\u51fa\u6765\u5206\u6790\u4e86\u4e00\u4e0b\u3002\u5177\u4f53\u5982\u4e0b\uff1a<\/span><\/p>\n

<\/div><\/p>\n

\u7269\u7406\u94fe\u8def\u5c42\u4e2d\u6570\u636e\u7528\u7535\u4fe1\u53f7\u4f20\u8f93\uff0c\u5bf9\u5e940\u548c1\uff0c\u4e00\u4e2a\u4fe1\u53f7\u4e3a1 bit\uff1b\u62a5\u6587\u4e2d\u4e3a16\u8fdb\u5236\uff080x\u8868\u793a\uff09\uff0c\u4e00\u4e2a\u53604\u4f4d\uff08bit\uff09\uff0c\u4e00\u7ec4\u53608 bit\u3002<\/span><\/p>\n

\u6700\u5916\u5c42\uff08Ethernet II\uff0c\u6570\u636e\u94fe\u8def\u5c42\u5c01\u88c5\uff09\u5360\u752814*8=112 bit\u3002<\/span><\/p>\n

\u5176\u4e2d6*8=48 bit\uff081-48 bit\uff09\u4e3a\u76ee\u7684MAC\u5730\u5740\uff1b<\/span><\/p>\n

6*8=48 bit<\/span>\uff0849-96 bit\uff09\u4e3a\u6e90MAC\u5730\u5740\uff1b<\/span><\/p>\n

2*8=16 bit<\/span>\uff0897-112 bit\uff09\u8868\u793a\u5c01\u88c5\u534f\u8bae\u4e3aIPv4\u3002<\/span><\/p>\n

<\/div><\/p>\n

\u7b2c\u4e8c\u5c42\uff08IP\uff0c\u7f51\u7edc\u5c42\uff09\u5360\u752820*8=160 bit\u3002<\/span><\/p>\n

\u5176\u4e2d113-116 bit\u8868\u793aIP\u534f\u8bae\u7248\u672c\u53f7\u4e3a4\uff0c\u5373IPv4\uff1b<\/span><\/p>\n

117-120 bit<\/span>\u8868\u793a\u62a5\u6587\u5934\u957f\u5ea6\u517120\u5b57\u8282\uff08byte\uff0c1 byte=8 bit\uff09\uff0c\u5360\u752880 bit\u957f\u5ea6\uff1b<\/span><\/p>\n

121-128 bit<\/span>\u8868\u793aDS Field\uff08\u533a\u5206\u670d\u52a1\u57df\uff09\uff0c\u5360\u75288 bit\uff0c\u524d6 bit\u4e3aDSCP\uff08\u533a\u5206\u670d\u52a1\u4ee3\u7801\u70b9\uff0c\u5373DS\u6807\u8bb0\u503c\uff09\uff0c\u540e2 bit\u4e3aCU\u6216ECN\uff08\u663e\u793a\u62e5\u585e\u901a\u77e5\uff09\uff0c\u8fd9\u4e24\u90e8\u5206\u5171\u540c\u7ec4\u6210\u4e00\u4e2a\u53ef\u6269\u5c55\u6027\u76f8\u5bf9\u8f83\u5f3a\u7684\u65b9\u6cd5\u4ee5\u6b64\u6765\u4fdd\u8bc1IP\u7684\u670d\u52a1\u8d28\u91cf\uff1b<\/span><\/p>\n

129-144 bit<\/span>\u8868\u793a\u603b\u957f\u5ea6\uff0c\u6b64\u5904\u4e3a60\uff0c<\/span><\/p>\n

145-160 bit<\/span>\u8868\u793a\u6807\u8bc6\u7b26<\/span><\/p>\n

161-176 bit<\/span>\u8868\u793a\u6807\u5fd7\u548c\u7247\u79fb\u4f4d\uff0c\u5982\u679c\u62a5\u6587\u6709\u5206\u7247\u76f8\u5173\u5c5e\u6027\uff0c\u6b64\u5904\u6807\u5fd7\u4f1a\u53d8\u5316\uff1b<\/span><\/p>\n

177-184 bit<\/span>\u8868\u793aTTL\u503c\uff1b<\/span><\/p>\n

185-192 bit<\/span>\u8868\u793a\u5185\u5c42\u5c01\u88c5\u534f\u8bae\uff0c\u672c\u62a5\u6587\u4e2d\u4e3aTCP\u534f\u8bae\uff1b<\/span><\/p>\n

193-208 bit<\/span>\u8868\u793a\u5934\u90e8\u6821\u9a8c\u548c\uff1b<\/span><\/p>\n

209-240 bit<\/span>\u8868\u793a\u6e90IP\u5730\u5740\uff0c\u8f6c\u6362\u4e3a\u70b9\u520610\u8fdb\u5236\u5373\u4e3a10.1.1.2\uff1b<\/span><\/p>\n

241-272 bit<\/span>\u8868\u793a\u76ee\u7684IP\u5730\u5740\uff0c\u8f6c\u6362\u4e3a\u70b9\u520610 \u8fdb\u5236\u5373\u4e3a10.1.1.2\u3002<\/span><\/p>\n

<\/div><\/p>\n

\u7b2c\u4e09\u5c42\uff08TCP\uff0c\u4f20\u8f93\u5c42\uff09\u5360\u7528\u5269\u4f59\u4f4d\u3002<\/span><\/p>\n

273-288 bit<\/span>\u4e3a\u6e90\u7aef\u53e3\u53f7\uff1b<\/span><\/p>\n

288-304 bit<\/span>\u4e3a\u76ee\u7684\u7aef\u53e3\u53f7\uff1b<\/span><\/p>\n

305-336 bit<\/span>\u4e3a\u5e8f\u5217\u53f7\uff0c\u5373TCP\u4e09\u6b21\u63e1\u624b\u4e2d\u7684seq\uff1b<\/span><\/p>\n

337-368 bit<\/span>\u4e3a\u5e94\u7b54\u7801\uff0c\u5373TCP\u4e09\u6b21\u63e1\u624b\u4e2d\u7684ack\uff1b<\/span><\/p>\n

369-384 bit<\/span>\u4e3aSYN\u6807\u5fd7\u4f4d\uff0c\u5373TCP\u4e09\u6b21\u63e1\u624b\u4e2d\u7684SYN\uff1b<\/span><\/p>\n

385-400 bit<\/span>\u4e3a\u7a97\u53e3\u5927\u5c0f\uff1b<\/span><\/p>\n

401-416 bit<\/span>\u4e3a\u6821\u9a8c\u548c\uff1b<\/span><\/p>\n

417-432 bit<\/span>\u4e3aURG\u4f4d\uff0curgent\u673a\u5236\uff0c\u662f\u7528\u4e8e\u901a\u77e5\u5e94\u7528\u5c42\u9700\u8981\u63a5\u6536urgent data\uff0c\u5728urgent data\u63a5\u6536\u5b8c\u6210\u540e\uff0c\u901a\u77e5\u5e94\u7528\u5c42urgent data\u6570\u636e\u63a5\u6536\u5b8c\u6bd5\uff1b<\/span><\/p>\n

433-592 bit<\/span>\u4e3a20bytes\u7684\u5404\u7c7boptions\uff0c\u5176\u4e2d\uff1a<\/span><\/p>\n

433-464 bit<\/span>\u4e3aMMS\u76f8\u5173\u9879\uff0c\u5305\u542b8 bit\u7684\u7c7b\u578b\uff082\u4e3aMaxium Segment Size\uff0cTCP\u4e00\u6b21\u4f20\u8f93\u53d1\u9001\u7684\u6700\u5927\u6570\u636e\u6bb5\u957f\u5ea6\uff09\uff0c8 bit\u7684\u957f\u5ea6\uff0c16bit\u7684MMS\u503c\uff1b<\/span><\/p>\n

465-472 bit<\/span>\u4e3aMOP\u76f8\u5173\u9879\uff1b<\/span><\/p>\n

473-496 bit<\/span>\u4e3a\u6ed1\u52a8\u7a97\u53e3\u9879\uff1b<\/span><\/p>\n

497-512 bit<\/span>\u4e3a\u5141\u8bb8SACK\u9879\uff08\u9009\u62e9\u786e\u8ba4\uff0cTCP\u6536\u5230\u4e71\u5e8f\u6570\u636e\u540e\uff0c\u4f1a\u5c06\u5176\u653e\u5165\u4e71\u5e8f\u961f\u5217\u4e2d\uff0c\u7136\u540e\u53d1\u9001\u91cd\u590dACK\u7ed9\u5bf9\u7aef\u3002\u5bf9\u7aef\u6536\u5230\u591a\u4e2a\u91cd\u590d\u7684ACK\u540e\uff0c\u5c31\u4f1a\u63a8\u6d4b\u5230\u53ef\u80fd\u53d1\u751f\u4e86\u6570\u636e\u4e22\u5931\uff0c\u518d\u91cd\u4f20\u6570\u636e\u3002\u5982\u679c\u4e71\u5e8f\u7684\u6570\u636e\u6bd4\u8f83\u96f6\u6563\uff0c\u5219\u8fd9\u79cd\u673a\u5236\u7684\u6548\u7387\u4f1a\u5f88\u4f4e\u3002\u4f7f\u7528SACK\u9009\u9879\u53ef\u4ee5\u544a\u77e5\u53d1\u5305\u65b9\u6536\u5230\u4e86\u54ea\u4e9b\u6570\u636e\uff0c\u53d1\u5305\u65b9\u6536\u5230\u8fd9\u4e9b\u4fe1\u606f\u540e\u5c31\u4f1a\u77e5\u9053\u54ea\u4e9b\u6570\u636e\u4e22\u5931\uff0c\u7136\u540e\u7acb\u5373\u91cd\u4f20\u7f3a\u5931\u90e8\u5206\u5373\u53ef\u3002\u8fd9\u5c31\u5927\u5927\u63d0\u9ad8\u4e86\u6570\u636e\u91cd\u4f20\u7684\u901f\u5ea6\u3002\uff09<\/span><\/p>\n

513-592 bit<\/span>\u4e3a\u65f6\u95f4\u6233\u9879\uff0c\u5305\u542b\u62a5\u6587\u53d1\u9001\u65f6\u95f4TSvla\u548c\u63a5\u6536\u7aef\u63a5\u6536\u65f6\u95f4TSecr\u3002\uff08\u5f53\u53d1\u9001\u7aef\u6536\u5230ACK Segment\u540e\uff0c\u53d6\u51faTSscr\uff0c\u548c\u5f53\u524d\u65f6\u95f4\u505a\u7b97\u672f\u5dee\uff0c\u5373\u53ef\u5b8c\u6210\u4e00\u6b21RTT\u7684\u6d4b\u91cf\u3002\u82e5\u975e\u901a\u8fc7Timestamp Option\u6765\u8ba1\u7b97RTT\uff0c\u5927\u90e8\u5206TCP\u5b9e\u73b0\u53ea\u4f1a\u4ee5\u201c\u6bcf\u4e2aWindow\u91c7\u6837\u4e00\u6b21\u201d\u7684\u9891\u7387\u6765\u6d4b\u7b97RTT\u3002\u56e0\u6b64\u901a\u8fc7Timestamp Option\uff0c\u53ef\u4ee5\u5b9e\u73b0\u66f4\u5bc6\u96c6\u7684RTT\u91c7\u6837\uff0c\u4f7fRTT\u7684\u6d4b\u7b97\u66f4\u7cbe\u786e\u3002\uff09<\/span><\/p>\n

\u00a0<\/span><\/p>\n

\u7136\u540e\u6211\u6293\u4e86\u4e00\u4e2a\u672c\u5730\u8bbf\u95ee\u8fdc\u7a0b\u4e3b\u673a\u7684\u62a5\u6587\u6765\u5bf9\u6bd4\u4e00\u4e9b\u5173\u952e\u4f4d\u7684\u4fe1\u606f\uff0c\u5982\u4e0b\uff1a<\/span><\/p>\n

<\/div><\/p>\n

\u53ef\u4ee5\u770b\u5230\u662f\u8bf7\u6c42\u8fdc\u7a0b\u684c\u9762\u7684\u56de\u5305\uff0c\u7531\u76ee\u7684\u4e3b\u673a\u76843389\u56de\u5305\u3002\u4e2a\u522b\u5173\u952e\u5b57\u6bb5\u5982\u4e0b\uff1a<\/span><\/p>\n

<\/div><\/p>\n

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<\/div><\/p>\n

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<\/div><\/p>\n

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<\/div><\/p>\n

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