TCPdump\u6293\u5305\u547d\u4ee4 \u9664\u4e86\u8fd9\u4e09\u79cd\u7c7b\u578b\u7684\u5173\u952e\u5b57\u4e4b\u5916\uff0c\u5176\u4ed6\u91cd\u8981\u7684\u5173\u952e\u5b57\u5982\u4e0b\uff1agateway\uff0c broadcast\uff0cless\uff0c greater\uff0c \u8fd8\u6709\u4e09\u79cd\u903b\u8f91\u8fd0\u7b97\uff0c\u53d6\u975e\u8fd0\u7b97\u662f \u2018not ' '! \u2018\uff0c \u4e0e\u8fd0\u7b97\u662f\u2019and\u2019\uff0c\u2019&&';\u6216\u8fd0\u7b97\u662f\u2019or\u2019 \uff0c\u2019||\u2019\uff1b \u8fd9\u4e9b\u5173\u952e\u5b57\u53ef\u4ee5\u7ec4\u5408\u8d77\u6765\u6784\u6210\u5f3a\u5927\u7684\u7ec4\u5408\u6761\u4ef6\u6765\u6ee1\u8db3\u4eba\u4eec\u7684\u9700\u8981\u3002<\/p>\n \u56db\u3001\u8f93\u51fa\u7ed3\u679c\u4ecb\u7ecd<\/strong> \u4e94\u3001\u4e3e\u4f8b<\/strong> tcpdump\u91c7\u7528\u547d\u4ee4\u884c\u65b9\u5f0f\uff0c\u5b83\u7684\u547d\u4ee4\u683c\u5f0f\u4e3a\uff1a \u00b7 01:33:40.41\uff1a\u8fd9\u4e2a\u662f\u6b64\u6570\u636e\u5305\u88ab\u6355\u83b7\u7684\u65f6\u95f4\uff0c\u201c\u65f6:\u5206:\u79d2\u201d\u7684\u5355\u4f4d\u3002<\/p>\n \u00b7 IP\uff1a\u901a\u8fc7\u7684\u901a\u4fe1\u534f\u8bae\u662fIP\u3002<\/p>\n \u00b7 192.168.1.100.22>\uff1a\u4f20\u9001\u7aef\u662f192.168.1.100\u8fd9\u4e2aIP\uff0c\u800c\u4f20\u9001\u7684Port Number\u4e3a22\uff0c\u90a3\u4e2a\u5927\u4e8e\uff08>\uff09\u7684\u7b26\u53f7\u6307\u7684\u662f\u6570\u636e\u5305\u7684\u4f20\u8f93\u65b9\u5411\u3002<\/p>\n \u00b7 192.168.1.11.1190\uff1a\u63a5\u6536\u7aef\u7684IP\u662f192.168.1.11\uff0c\u4e14\u8be5\u4e3b\u673a\u5f00\u542fport 1190\u6765\u63a5\u6536\u3002<\/p>\n \u00b7 P 116:232(116)\uff1a\u8fd9\u4e2a\u6570\u636e\u5305\u5e26\u6709PUSH\u7684\u6570\u636e\u4f20\u8f93\u6807\u5fd7\uff0c\u4e14\u4f20\u8f93\u7684\u6570\u636e\u4e3a\u6574\u4f53\u6570\u636e\u7684116~232 Byte\uff0c\u6240\u4ee5\u8fd9\u4e2a\u6570\u636e\u5305\u5e26\u6709116 Bytes\u7684\u6570\u636e\u91cf\u3002<\/p>\n \u00b7 ack 1 win 9648\uff1aACK\u4e0eWindow size\u7684\u76f8\u5173\u8d44\u6599\u3002<\/p>\n \u6700\u7b80\u5355\u7684\u8bf4\u6cd5\uff0c\u5c31\u662f\u8be5\u6570\u636e\u5305\u662f\u7531192.168.1.100\u4f20\u5230192.168.1.11\uff0c\u901a\u8fc7\u7684port\u662f\u753122\u52301190\uff0c\u4e14\u5e26\u6709116 Bytes\u7684\u6570\u636e\u91cf\uff0c\u4f7f\u7528\u7684\u662fPUSH\u7684\u6807\u8bb0\uff0c\u800c\u4e0d\u662fSYN\u4e4b\u7c7b\u7684\u4e3b\u52a8\u8054\u673a\u6807\u5fd7\u3002<\/p>\n \u63a5\u4e0b\u6765\uff0c\u5728\u4e00\u4e2a\u7f51\u7edc\u72b6\u6001\u5f88\u5fd9\u7684\u4e3b\u673a\u4e0a\u9762\uff0c\u4f60\u60f3\u8981\u53d6\u5f97\u67d0\u53f0\u4e3b\u673a\u5bf9\u4f60\u8054\u673a\u7684\u6570\u636e\u5305\u6570\u636e\u65f6\uff0c\u4f7f\u7528 tcpdump\u914d\u5408\u7ba1\u7ebf\u547d\u4ee4\u4e0e\u6b63\u5219\u8868\u8fbe\u5f0f\u4e5f\u53ef\u4ee5\uff0c\u4e0d\u8fc7\uff0c\u6bd5\u7adf\u4e0d\u597d\u6355\u83b7\u3002\u6211\u4eec\u53ef\u4ee5\u901a\u8fc7tcpdump\u7684\u8868\u8fbe\u5f0f\u529f\u80fd\uff0c\u5c31\u80fd\u591f\u8f7b\u6613\u5730\u5c06\u6240\u9700\u8981\u7684\u6570\u636e\u72ec\u7acb\u7684\u53d6\u51fa \u6765\u3002\u5728\u4e0a\u9762\u7684\u8303\u4f8b\u4e00\u5f53\u4e2d\uff0c\u6211\u4eec\u4ec5\u9488\u5bf9eth0\u505a\u76d1\u542c\uff0c\u6240\u4ee5\u6574\u4e2aeth0\u63a5\u53e3\u4e0a\u9762\u7684\u6570\u636e\u90fd\u4f1a\u88ab\u663e\u793a\u5230\u5c4f\u5e55\u4e0a\uff0c\u4f46\u8fd9\u6837\u4e0d\u597d\u5206\u6790\uff0c\u53ef\u4ee5\u7b80\u5316\u5417\uff1f\u4f8b\u5982\uff0c\u53ea\u53d6\u51fa port 21\u7684\u8054\u673a\u6570\u636e\u5305\uff0c\u53ef\u4ee5\u8fd9\u6837\u505a\uff1a<\/p>\n \u770b\uff01\u8fd9\u6837\u5c31\u4ec5\u53d6\u51faport 21\u7684\u4fe1\u606f\uff0c\u5982\u679c\u4ed4\u7ec6\u770b\u7684\u8bdd\uff0c\u4f60\u4f1a\u53d1\u73b0\u6570\u636e\u5305\u7684\u4f20\u9012\u90fd\u662f\u53cc\u5411\u7684\uff0cClient\u7aef\u53d1\u51fa\u8bf7\u6c42\u800cServer\u7aef\u5219\u4e88\u4ee5\u54cd\u5e94\uff0c\u6240\u4ee5\uff0c\u5f53\u7136\u662f\u6709\u53bb\u6709\u56de\u4e86\u3002\u800c\u6211\u4eec\u4e5f\u5c31\u53ef\u4ee5\u7ecf\u8fc7\u8fd9\u4e2a\u6570\u636e\u5305\u7684\u6d41\u5411\u6765\u4e86\u89e3\u5230\u6570\u636e\u5305\u8fd0\u52a8\u7684\u8fc7\u7a0b\u4e86\u3002\u4f8b\u5982\uff1a<\/p>\n \u00b7 \u6211\u4eec\u5148\u5728\u4e00\u4e2a\u7ec8\u7aef\u673a\u7a97\u53e3\u8f93\u5165\u201ctcpdump-i lo-nn\u201d\u7684\u76d1\u542c\u3002<\/p>\n \u00b7 \u518d\u53e6\u5f00\u4e00\u4e2a\u7ec8\u7aef\u673a\u7a97\u53e3\u6765\u5bf9\u672c\u673a\uff08127.0.0.1\uff09\u767b\u5f55\u201cssh localhost\u201d\uff0c\u90a3\u4e48\u8f93\u51fa\u7684\u7ed3\u679c\u4f1a\u662f\u5982\u4f55\uff1f<\/p>\n \u4ee3\u7801\u663e\u793a\u7684\u5934\u4e24\u884c\u662ftcpdump\u7684\u57fa\u672c\u8bf4\u660e\uff0c\u7136\u540e\uff1a<\/p>\n \u00b7 \u7b2c3\u884c\u663e\u793a\u7684\u662f\u6765\u81eaClient\u7aef\u5e26\u6709SYN\u4e3b\u52a8\u8054\u673a\u7684\u6570\u636e\u5305\u3002 \u4ece\u7b2c3~5\u884c\u7684\u6d41\u7a0b\u6765\u770b\uff0c\u719f\u4e0d\u719f\u6089\u554a\uff1f\u6ca1\u9519\u3002\u90a3\u5c31\u662f3\u6b21\u63e1\u624b\u7684\u57fa\u7840\u6d41\u7a0b\uff0c\u6709\u8da3\u5427\u3002\u4e0d\u8fc7 tcpdump\u4e4b\u6240\u4ee5\u88ab\u79f0\u4e3a\u9ed1\u5ba2\u8f6f\u4ef6\u4e4b\u4e00\u8fdc\u4e0d\u6b62\u4e0a\u9762\u4ecb\u7ecd\u7684\u529f\u80fd\u3002\u4e0a\u9762\u4ecb\u7ecd\u7684\u529f\u80fd\u53ef\u4ee5\u7528\u6765\u4f5c\u4e3a\u6211\u4eec\u4e3b\u673a\u7684\u6570\u636e\u5305\u8054\u673a\u4e0e\u4f20\u8f93\u7684\u6d41\u7a0b\u5206\u6790\uff0c\u8fd9\u5c06\u6709\u52a9\u4e8e\u6211\u4eec\u4e86\u89e3\u5230 \u6570\u636e\u5305\u7684\u8fd0\u4f5c\uff0c\u540c\u65f6\u4e86\u89e3\u5230\u4e3b\u673a\u7684\u9632\u706b\u5899\u8bbe\u7f6e\u89c4\u5219\u662f\u5426\u6709\u9700\u8981\u4fee\u8ba2\u7684\u5730\u65b9\u3002<\/p>\n \u8fd8\u6709\u66f4\u795e\u5947\u7684\u7528\u6cd5\u3002\u5f53\u6211\u4eec\u4f7f\u7528tcpdump\u5728Router\u4e0a\u9762\u76d1\u542c\u660e\u6587\u7684\u4f20\u8f93\u6570\u636e\u65f6\uff0c\u4f8b\u5982 FTP\u4f20\u8f93\u534f\u8bae\uff0c\u4f60\u89c9\u5f97\u4f1a\u53d1\u751f\u4ec0\u4e48\u95ee\u9898\u5462\uff1f\u6211\u4eec\u5148\u5728\u4e3b\u673a\u7aef\u6267\u884c\u201ctcpdump -i lo port 21 -nn \u2013X\u201d\uff0c\u7136\u540e\u518d\u4ee5FTP\u767b\u5f55\u672c\u673a\uff0c\u5e76\u8f93\u5165\u8d26\u53f7\u4e0e\u5bc6\u7801\uff0c\u7ed3\u679c\u4f60\u5c31\u53ef\u4ee5\u53d1\u73b0\u5982\u4e0b\u7684\u72b6\u51b5\uff1a<\/p>\n \u4e0a\u9762\u7684\u8f93\u51fa\u7ed3\u679c\u5df2\u7ecf\u88ab\u7b80\u5316\u8fc7\u4e86\uff0c\u4f60\u9700\u8981\u81ea\u884c\u5728\u4f60\u7684\u8f93\u51fa\u7ed3\u679c\u4e2d\u641c\u7d22\u76f8\u5173\u7684\u5b57\u7b26\u4e32\u624d\u884c\u3002\u4ece\u4e0a\u9762\u8f93\u51fa\u7ed3 \u679c\u7684\u7279\u6b8a\u5b57\u4f53\u4e2d\uff0c\u6211\u4eec\u53ef\u4ee5\u53d1\u73b0\u8be5FTP\u8f6f\u4ef6\u4f7f\u7528\u7684\u662f vsFTPd\uff0c\u5e76\u4e14\u7528\u6237\u8f93\u5165dmtsai\u8fd9\u4e2a\u8d26\u53f7\u540d\u79f0\uff0c\u4e14\u5bc6\u7801\u662fmypasswordisyou\u3002\u5982\u679c\u4f7f\u7528\u7684\u662f\u660e\u6587\u65b9\u5f0f\u6765\u4f20\u8f93\u4f60\u7684\u7f51\u7edc\u6570\u636e\u5462\uff1f<\/p>\n \u53e6\u5916\u4f60\u5f97\u4e86\u89e3\uff0c\u4e3a\u4e86\u8ba9\u7f51\u7edc\u63a5\u53e3\u53ef\u4ee5\u8ba9tcpdump\u76d1\u542c\uff0c\u6240\u4ee5\u6267\u884ctcpdump\u65f6\u7f51\u7edc\u63a5\u53e3\u4f1a\u542f \u52a8\u5728\u201c\u6df7\u6742\u6a21\u5f0f\uff08promiscuous\uff09\u201d\uff0c\u6240\u4ee5\u4f60\u4f1a\u5728 \/var\/log\/messages\u91cc\u9762\u770b\u5230\u5f88\u591a\u7684\u8b66\u544a\u4fe1\u606f\uff0c\u901a\u77e5\u4f60\u8bf4\u4f60\u7684\u7f51\u5361\u88ab\u8bbe\u7f6e\u6210\u4e3a\u6df7\u6742\u6a21\u5f0f\u3002\u522b\u62c5\u5fc3\uff0c\u90a3\u662f\u6b63\u5e38\u7684\u3002\u81f3\u4e8e\u66f4\u591a\u7684\u5e94\u7528\uff0c\u8bf7\u53c2\u8003man tcpdump\u4e86\u3002<\/p>\n <\/p>\n \u7b54\uff1atcpdump -i eth0 -nn 'port 22 and src host 192.168.1.100'\u3002<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n ##############\u4f8b\u5b502#######################################<\/p>\n <\/p>\n \u666e\u901a\u60c5\u51b5\u4e0b\uff0c\u76f4\u63a5\u542f\u52a8tcpdump\u5c06\u76d1\u89c6\u7b2c\u4e00\u4e2a\u7f51\u7edc\u754c\u9762\u4e0a\u6240\u6709\u6d41\u8fc7\u7684\u6570\u636e\u5305\u3002 A\u60f3\u8981\u622a\u83b7\u6240\u6709210.27.48.1 \u7684\u4e3b\u673a\u6536\u5230\u7684\u548c\u53d1\u51fa\u7684\u6240\u6709\u7684\u6570\u636e\u5305\uff1a B\u60f3\u8981\u622a\u83b7\u4e3b\u673a210.27.48.1 \u548c\u4e3b\u673a210.27.48.2 \u6216210.27.48.3\u7684\u901a\u4fe1\uff0c\u4f7f\u7528\u547d\u4ee4\uff1a\uff08\u5728\u547d\u4ee4\u884c\u4e2d\u9002\u7528\u3000\u3000\u3000\u62ec\u53f7\u65f6\uff0c\u4e00\u5b9a\u8981 C\u5982\u679c\u60f3\u8981\u83b7\u53d6\u4e3b\u673a210.27.48.1\u9664\u4e86\u548c\u4e3b\u673a210.27.48.2\u4e4b\u5916\u6240\u6709\u4e3b\u673a\u901a\u4fe1\u7684ip\u5305\uff0c\u4f7f\u7528\u547d\u4ee4\uff1a D\u5982\u679c\u60f3\u8981\u83b7\u53d6\u4e3b\u673a210.27.48.1\u63a5\u6536\u6216\u53d1\u51fa\u7684telnet\u5305\uff0c\u4f7f\u7528\u5982\u4e0b\u547d\u4ee4\uff1a E \u5bf9\u672c\u673a\u7684udp 123 \u7aef\u53e3\u8fdb\u884c\u76d1\u89c6 123 \u4e3antp\u7684\u670d\u52a1\u7aef\u53e3 F \u7cfb\u7edf\u5c06\u53ea\u5bf9\u540d\u4e3ahostname\u7684\u4e3b\u673a\u7684\u901a\u4fe1\u6570\u636e\u5305\u8fdb\u884c\u76d1\u89c6\u3002\u4e3b\u673a\u540d\u53ef\u4ee5\u662f\u672c\u5730\u4e3b\u673a\uff0c\u4e5f\u53ef\u4ee5\u662f\u7f51\u7edc\u4e0a\u7684\u4efb\u4f55\u4e00\u53f0\u8ba1\u7b97\u673a\u3002\u4e0b\u9762\u7684\u547d\u4ee4\u53ef\u4ee5\u8bfb\u53d6\u4e3b\u673ahostname\u53d1\u9001\u7684\u6240\u6709\u6570\u636e\uff1a G \u4e0b\u9762\u7684\u547d\u4ee4\u53ef\u4ee5\u76d1\u89c6\u6240\u6709\u9001\u5230\u4e3b\u673ahostname\u7684\u6570\u636e\u5305\uff1a H \u6211\u4eec\u8fd8\u53ef\u4ee5\u76d1\u89c6\u901a\u8fc7\u6307\u5b9a\u7f51\u5173\u7684\u6570\u636e\u5305\uff1a I \u5982\u679c\u4f60\u8fd8\u60f3\u76d1\u89c6\u7f16\u5740\u5230\u6307\u5b9a\u7aef\u53e3\u7684TCP\u6216UDP\u6570\u636e\u5305\uff0c\u90a3\u4e48\u6267\u884c\u4ee5\u4e0b\u547d\u4ee4\uff1a J \u5982\u679c\u60f3\u8981\u83b7\u53d6\u4e3b\u673a210.27.48.1\u9664\u4e86\u548c\u4e3b\u673a210.27.48.2\u4e4b\u5916\u6240\u6709\u4e3b\u673a\u901a\u4fe1\u7684ip\u5305 K \u60f3\u8981\u622a\u83b7\u4e3b\u673a210.27.48.1 \u548c\u4e3b\u673a210.27.48.2 \u6216210.27.48.3\u7684\u901a\u4fe1\uff0c\u4f7f\u7528\u547d\u4ee4 L \u5982\u679c\u60f3\u8981\u83b7\u53d6\u4e3b\u673a210.27.48.1\u9664\u4e86\u548c\u4e3b\u673a210.27.48.2\u4e4b\u5916\u6240\u6709\u4e3b\u673a\u901a\u4fe1\u7684ip\u5305\uff0c\u4f7f\u7528\u547d\u4ee4\uff1a M \u5982\u679c\u60f3\u8981\u83b7\u53d6\u4e3b\u673a210.27.48.1\u63a5\u6536\u6216\u53d1\u51fa\u7684telnet\u5305\uff0c\u4f7f\u7528\u5982\u4e0b\u547d\u4ee4\uff1a \u7b2c\u4e09\u79cd\u662f\u534f\u8bae\u7684\u5173\u952e\u5b57\uff0c\u4e3b\u8981\u5305\u62ecfddi,ip ,arp,rarp,tcp,udp\u7b49\u7c7b\u578b \u5982\u679c\u5728ethernet \u4f7f\u7528\u6df7\u6742\u6a21\u5f0f \u7cfb\u7edf\u7684\u65e5\u5fd7\u5c06\u4f1a\u8bb0\u5f55<\/p>\n May 7 20:03:46 localhost kernel: eth0: Promiscuous mode enabled. tcpdump\u5bf9\u622a\u83b7\u7684\u6570\u636e\u5e76\u6ca1\u6709\u8fdb\u884c\u5f7b\u5e95\u89e3\u7801\uff0c\u6570\u636e\u5305\u5185\u7684\u5927\u90e8\u5206\u5185\u5bb9\u662f\u4f7f\u7528\u5341\u516d\u8fdb\u5236\u7684\u5f62\u5f0f\u76f4\u63a5\u6253\u5370\u8f93\u51fa\u7684\u3002\u663e\u7136\u8fd9\u4e0d\u5229\u4e8e\u5206\u6790\u7f51\u7edc\u6545\u969c\uff0c\u901a\u5e38\u7684\u89e3\u51b3 \u529e\u6cd5\u662f\u5148\u4f7f\u7528\u5e26-w\u53c2\u6570\u7684tcpdump \u622a\u83b7\u6570\u636e\u5e76\u4fdd\u5b58\u5230\u6587\u4ef6\u4e2d\uff0c\u7136\u540e\u518d\u4f7f\u7528\u5176\u4ed6\u7a0b\u5e8f\u8fdb\u884c\u89e3\u7801\u5206\u6790\u3002\u5f53\u7136\u4e5f\u5e94\u8be5\u5b9a\u4e49\u8fc7\u6ee4\u89c4\u5219\uff0c\u4ee5\u907f\u514d\u6355\u83b7\u7684\u6570\u636e\u5305\u586b\u6ee1\u6574\u4e2a\u786c\u76d8\u3002<\/p>\n \u9664\u4e86\u8fc7\u6ee4\u8bed\u53e5\uff0c\u8fd8\u6709\u4e00\u4e2a\u5f88\u91cd\u8981\u7684\u53c2\u6570\uff0c\u4e5f\u5c31\u662f\u8bf4\uff0c\u5982\u679c\u8fd9\u4e2a\u53c2\u6570\u4e0d\u8bbe\u7f6e\u6b63\u786e\uff0c\u4f1a\u5bfc\u81f4\u5305\u6570\u636e\u7684\u4e22\u5931\uff01<\/p>\n \u5b83\u5c31\u662f-s \u53c2\u6570\uff0csnaplen, \u4e5f\u5c31\u662f\u6570\u636e\u5305\u7684\u622a\u53d6\u957f\u5ea6\uff0c\u4ed4\u7ec6\u770bman\u5c31\u4f1a\u660e\u767d\u7684\uff01\u9ed8\u8ba4\u622a\u53d6\u957f\u5ea6\u4e3a60\u4e2a\u5b57\u8282\uff0c\u4f46\u4e00\u822cethernet MTU\u90fd\u662f1500\u5b57\u8282\u3002\u6240\u4ee5\uff0c\u8981\u6293\u53d6\u5927\u4e8e60\u5b57\u8282\u7684\u5305\u65f6\uff0c\u4f7f\u7528\u9ed8\u8ba4\u53c2\u6570\u5c31\u4f1a\u5bfc\u81f4\u5305\u6570\u636e\u4e22\u5931\uff01<\/p>\n \u53ea\u8981\u4f7f\u7528-s 0\u5c31\u53ef\u4ee5\u6309\u5305\u957f\uff0c\u622a\u53d6\u6570\u636e\uff01<\/p>\n","protected":false},"excerpt":{"rendered":" TCPdump\u6293\u5305\u547d\u4ee4 tcpdump\u662f\u4e00\u4e2a\u7528\u4e8e\u622a\u53d6\u7f51\u7edc\u5206\u7ec4\uff0c\u5e76\u8f93\u51fa\u5206\u7ec4\u5185\u5bb9\u7684\u5de5\u5177\u3002tcpdump\u51ed\u501f\u5f3a\u5927\u7684\u529f\u80fd\u548c\u7075\u6d3b\u7684\u622a\u53d6\u7b56\u7565\uff0c\u4f7f\u5176\u6210\u4e3a\u7c7bUNIX\u7cfb\u7edf\u4e0b\u7528\u4e8e\u7f51\u7edc\u5206\u6790\u548c\u95ee\u9898\u6392\u67e5\u7684\u9996\u9009\u5de5\u5177\u3002 tcpdump\u63d0\u4f9b\u4e86\u6e90\u4ee3\u7801\uff0c\u516c\u5f00\u4e86\u63a5\u53e3\uff0c\u56e0\u6b64\u5177\u5907\u5f88\u5f3a\u7684\u53ef\u6269\u5c55\u6027\uff0c\u5bf9\u4e8e\u7f51\u7edc\u7ef4\u62a4\u548c\u5165\u4fb5\u8005\u90fd\u662f\u975e\u5e38\u6709\u7528\u7684\u5de5\u5177\u3002tcpdump\u5b58\u5728\u4e8e\u57fa\u672c\u7684Linux\u7cfb\u7edf \u4e2d\uff0c\u7531\u4e8e\u5b83\u9700\u8981\u5c06\u7f51\u7edc\u754c\u9762\u8bbe\u7f6e\u4e3a\u6df7\u6742\u6a21\u5f0f\uff0c\u666e\u901a\u7528\u6237\u4e0d\u80fd\u6b63\u5e38\u6267\u884c\uff0c\u4f46\u5177\u5907root\u6743\u9650\u7684\u7528\u6237\u53ef\u4ee5\u76f4\u63a5\u6267\u884c\u5b83\u6765\u83b7\u53d6\u7f51\u7edc\u4e0a\u7684\u4fe1\u606f\u3002\u56e0\u6b64\u7cfb\u7edf\u4e2d\u5b58\u5728\u7f51\u7edc\u5206\u6790\u5de5 \u5177\u4e3b\u8981\u4e0d\u662f\u5bf9\u672c\u673a\u5b89\u5168\u7684\u5a01\u80c1\uff0c\u800c\u662f\u5bf9\u7f51\u7edc\u4e0a\u7684\u5176\u4ed6\u8ba1\u7b97\u673a\u7684\u5b89\u5168\u5b58\u5728\u5a01\u80c1\u3002 \u4e00\u3001\u6982\u8ff0 \u987e\u540d\u601d\u4e49\uff0ctcpdump\u53ef\u4ee5\u5c06\u7f51\u7edc\u4e2d\u4f20\u9001\u7684\u6570\u636e\u5305\u7684\u201c\u5934\u201d\u5b8c\u5168\u622a\u83b7\u4e0b\u6765\u63d0\u4f9b\u5206\u6790\u3002\u5b83\u652f\u6301\u9488\u5bf9\u7f51\u7edc\u5c42\u3001\u534f\u8bae\u3001\u4e3b\u673a\u3001\u7f51\u7edc\u6216\u7aef\u53e3\u7684\u8fc7\u6ee4\uff0c\u5e76\u63d0\u4f9band\u3001or\u3001not\u7b49\u903b\u8f91\u8bed\u53e5\u6765\u5e2e\u52a9\u4f60\u53bb\u6389\u65e0\u7528\u7684\u4fe1\u606f\u3002 \u5f15\u7528 # tcpdump -vv tcpdump: listening on eth0, link-type EN10MB (Ethernet), capture size 96 bytes 11:53:21.444591 IP (tos 0x10, ttl 64, id 19324, offset 0, flags [DF], proto 6, length: 92) asptest.localdomain.ssh > 192.168.228.244.1858: P 3962132600:3962132652(52) ack 2726525936 win 1266 asptest.localdomain.1077 > 192.168.228.153.domain: [bad udp cksum 166e!] 325+…<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-154","post","type-post","status-publish","format-standard","hentry","category-test"],"aioseo_notices":[],"brizy_media":[],"_links":{"self":[{"href":"https:\/\/peloo.net\/index.php?rest_route=\/wp\/v2\/posts\/154","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/peloo.net\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/peloo.net\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/peloo.net\/index.php?rest_route=\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/peloo.net\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=154"}],"version-history":[{"count":1,"href":"https:\/\/peloo.net\/index.php?rest_route=\/wp\/v2\/posts\/154\/revisions"}],"predecessor-version":[{"id":155,"href":"https:\/\/peloo.net\/index.php?rest_route=\/wp\/v2\/posts\/154\/revisions\/155"}],"wp:attachment":[{"href":"https:\/\/peloo.net\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=154"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/peloo.net\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=154"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/peloo.net\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=154"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}
\ntcpdump\u662f\u4e00\u4e2a\u7528\u4e8e\u622a\u53d6\u7f51\u7edc\u5206\u7ec4\uff0c\u5e76\u8f93\u51fa\u5206\u7ec4\u5185\u5bb9\u7684\u5de5\u5177\u3002tcpdump\u51ed\u501f\u5f3a\u5927\u7684\u529f\u80fd\u548c\u7075\u6d3b\u7684\u622a\u53d6\u7b56\u7565\uff0c\u4f7f\u5176\u6210\u4e3a\u7c7bUNIX\u7cfb\u7edf\u4e0b\u7528\u4e8e\u7f51\u7edc\u5206\u6790\u548c\u95ee\u9898\u6392\u67e5\u7684\u9996\u9009\u5de5\u5177\u3002
\ntcpdump\u63d0\u4f9b\u4e86\u6e90\u4ee3\u7801\uff0c\u516c\u5f00\u4e86\u63a5\u53e3\uff0c\u56e0\u6b64\u5177\u5907\u5f88\u5f3a\u7684\u53ef\u6269\u5c55\u6027\uff0c\u5bf9\u4e8e\u7f51\u7edc\u7ef4\u62a4\u548c\u5165\u4fb5\u8005\u90fd\u662f\u975e\u5e38\u6709\u7528\u7684\u5de5\u5177\u3002tcpdump\u5b58\u5728\u4e8e\u57fa\u672c\u7684Linux\u7cfb\u7edf \u4e2d\uff0c\u7531\u4e8e\u5b83\u9700\u8981\u5c06\u7f51\u7edc\u754c\u9762\u8bbe\u7f6e\u4e3a\u6df7\u6742\u6a21\u5f0f\uff0c\u666e\u901a\u7528\u6237\u4e0d\u80fd\u6b63\u5e38\u6267\u884c\uff0c\u4f46\u5177\u5907root\u6743\u9650\u7684\u7528\u6237\u53ef\u4ee5\u76f4\u63a5\u6267\u884c\u5b83\u6765\u83b7\u53d6\u7f51\u7edc\u4e0a\u7684\u4fe1\u606f\u3002\u56e0\u6b64\u7cfb\u7edf\u4e2d\u5b58\u5728\u7f51\u7edc\u5206\u6790\u5de5 \u5177\u4e3b\u8981\u4e0d\u662f\u5bf9\u672c\u673a\u5b89\u5168\u7684\u5a01\u80c1\uff0c\u800c\u662f\u5bf9\u7f51\u7edc\u4e0a\u7684\u5176\u4ed6\u8ba1\u7b97\u673a\u7684\u5b89\u5168\u5b58\u5728\u5a01\u80c1\u3002
\n\u4e00\u3001\u6982\u8ff0
\n<\/strong>\u987e\u540d\u601d\u4e49\uff0ctcpdump\u53ef\u4ee5\u5c06\u7f51\u7edc\u4e2d\u4f20\u9001\u7684\u6570\u636e\u5305\u7684\u201c\u5934\u201d\u5b8c\u5168\u622a\u83b7\u4e0b\u6765\u63d0\u4f9b\u5206\u6790\u3002\u5b83\u652f\u6301\u9488\u5bf9\u7f51\u7edc\u5c42\u3001\u534f\u8bae\u3001\u4e3b\u673a\u3001\u7f51\u7edc\u6216\u7aef\u53e3\u7684\u8fc7\u6ee4\uff0c\u5e76\u63d0\u4f9band\u3001or\u3001not\u7b49\u903b\u8f91\u8bed\u53e5\u6765\u5e2e\u52a9\u4f60\u53bb\u6389\u65e0\u7528\u7684\u4fe1\u606f\u3002
\n\u5f15\u7528
\n# tcpdump -vv
\ntcpdump: listening on eth0, link-type EN10MB (Ethernet), capture size 96 bytes
\n11:53:21.444591 IP (tos 0x10, ttl 64, id 19324, offset 0, flags [DF], proto 6, length: 92) asptest.localdomain.ssh > 192.168.228.244.1858: P 3962132600:3962132652(52) ack 2726525936 win 1266
\nasptest.localdomain.1077 > 192.168.228.153.domain: [bad udp cksum 166e!] 325+ PTR? 244.228.168.192.in-addr.arpa. (46)
\n11:53:21.446929 IP (tos 0x0, ttl 64, id 42911, offset 0, flags [DF], proto 17, length: 151) 192.168.228.153.domain > asptest.localdomain.1077: 325 NXDomain q: PTR? 244.228.168.192.in-addr.arpa. 0\/1\/0 ns: 168.192.in-addr.arpa. (123)
\n11:53:21.447408 IP (tos 0x10, ttl 64, id 19328, offset 0, flags [DF], proto 6, length: 172) asptest.localdomain.ssh > 192.168.228.244.1858: P 168:300(132) ack 1 win 1266
\n347 packets captured
\n1474 packets received by filter
\n745 packets dropped by kernel
\n\u4e0d\u5e26\u53c2\u6570\u7684tcpdump\u4f1a\u6536\u96c6\u7f51\u7edc\u4e2d\u6240\u6709\u7684\u4fe1\u606f\u5305\u5934\uff0c\u6570\u636e\u91cf\u5de8\u5927\uff0c\u5fc5\u987b\u8fc7\u6ee4\u3002
\n\u4e8c\u3001\u9009\u9879\u4ecb\u7ecd<\/strong>
\n\u5f15\u7528
\n-A \u4ee5ASCII\u683c\u5f0f\u6253\u5370\u51fa\u6240\u6709\u5206\u7ec4\uff0c\u5e76\u5c06\u94fe\u8def\u5c42\u7684\u5934\u6700\u5c0f\u5316\u3002
\n-c \u5728\u6536\u5230\u6307\u5b9a\u7684\u6570\u91cf\u7684\u5206\u7ec4\u540e\uff0ctcpdump\u5c31\u4f1a\u505c\u6b62\u3002
\n-C \u5728\u5c06\u4e00\u4e2a\u539f\u59cb\u5206\u7ec4\u5199\u5165\u6587\u4ef6\u4e4b\u524d\uff0c\u68c0\u67e5\u6587\u4ef6\u5f53\u524d\u7684\u5927\u5c0f\u662f\u5426\u8d85\u8fc7\u4e86\u53c2\u6570file_size \u4e2d\u6307\u5b9a\u7684\u5927\u5c0f\u3002\u5982\u679c\u8d85\u8fc7\u4e86\u6307\u5b9a\u5927\u5c0f\uff0c\u5219\u5173\u95ed\u5f53\u524d\u6587\u4ef6\uff0c\u7136\u540e\u5728\u6253\u5f00\u4e00\u4e2a\u65b0\u7684\u6587\u4ef6\u3002\u53c2\u6570 file_size \u7684\u5355\u4f4d\u662f\u5146\u5b57\u8282\uff08\u662f1,000,000\u5b57\u8282\uff0c\u800c\u4e0d\u662f1,048,576\u5b57\u8282\uff09\u3002
\n-d \u5c06\u5339\u914d\u4fe1\u606f\u5305\u7684\u4ee3\u7801\u4ee5\u4eba\u4eec\u80fd\u591f\u7406\u89e3\u7684\u6c47\u7f16\u683c\u5f0f\u7ed9\u51fa\u3002
\n-dd \u5c06\u5339\u914d\u4fe1\u606f\u5305\u7684\u4ee3\u7801\u4ee5c\u8bed\u8a00\u7a0b\u5e8f\u6bb5\u7684\u683c\u5f0f\u7ed9\u51fa\u3002
\n-ddd \u5c06\u5339\u914d\u4fe1\u606f\u5305\u7684\u4ee3\u7801\u4ee5\u5341\u8fdb\u5236\u7684\u5f62\u5f0f\u7ed9\u51fa\u3002
\n-D \u6253\u5370\u51fa\u7cfb\u7edf\u4e2d\u6240\u6709\u53ef\u4ee5\u7528tcpdump\u622a\u5305\u7684\u7f51\u7edc\u63a5\u53e3\u3002
\n-e \u5728\u8f93\u51fa\u884c\u6253\u5370\u51fa\u6570\u636e\u94fe\u8def\u5c42\u7684\u5934\u90e8\u4fe1\u606f\u3002
\n-E \u7528spi@ipaddr algo:secret\u89e3\u5bc6\u90a3\u4e9b\u4ee5addr\u4f5c\u4e3a\u5730\u5740\uff0c\u5e76\u4e14\u5305\u542b\u4e86\u5b89\u5168\u53c2\u6570\u7d22\u5f15\u503cspi\u7684IPsec ESP\u5206\u7ec4\u3002
\n-f \u5c06\u5916\u90e8\u7684Internet\u5730\u5740\u4ee5\u6570\u5b57\u7684\u5f62\u5f0f\u6253\u5370\u51fa\u6765\u3002
\n-F \u4ece\u6307\u5b9a\u7684\u6587\u4ef6\u4e2d\u8bfb\u53d6\u8868\u8fbe\u5f0f\uff0c\u5ffd\u7565\u547d\u4ee4\u884c\u4e2d\u7ed9\u51fa\u7684\u8868\u8fbe\u5f0f\u3002
\n-i \u6307\u5b9a\u76d1\u542c\u7684\u7f51\u7edc\u63a5\u53e3\u3002
\n-l \u4f7f\u6807\u51c6\u8f93\u51fa\u53d8\u4e3a\u7f13\u51b2\u884c\u5f62\u5f0f\uff0c\u53ef\u4ee5\u628a\u6570\u636e\u5bfc\u51fa\u5230\u6587\u4ef6\u3002
\n-L \u5217\u51fa\u7f51\u7edc\u63a5\u53e3\u7684\u5df2\u77e5\u6570\u636e\u94fe\u8def\u3002
\n-m \u4ece\u6587\u4ef6module\u4e2d\u5bfc\u5165SMI MIB\u6a21\u5757\u5b9a\u4e49\u3002\u8be5\u53c2\u6570\u53ef\u4ee5\u88ab\u4f7f\u7528\u591a\u6b21\uff0c\u4ee5\u5bfc\u5165\u591a\u4e2aMIB\u6a21\u5757\u3002
\n-M \u5982\u679ctcp\u62a5\u6587\u4e2d\u5b58\u5728TCP-MD5\u9009\u9879\uff0c\u5219\u9700\u8981\u7528secret\u4f5c\u4e3a\u5171\u4eab\u7684\u9a8c\u8bc1\u7801\u7528\u4e8e\u9a8c\u8bc1TCP-MD5\u9009\u9009\u9879\u6458\u8981\uff08\u8be6\u60c5\u53ef\u53c2\u8003RFC 2385\uff09\u3002
\n-b \u5728\u6570\u636e-\u94fe\u8def\u5c42\u4e0a\u9009\u62e9\u534f\u8bae\uff0c\u5305\u62ecip\u3001arp\u3001rarp\u3001ipx\u90fd\u662f\u8fd9\u4e00\u5c42\u7684\u3002
\n-n \u4e0d\u628a\u7f51\u7edc\u5730\u5740\u8f6c\u6362\u6210\u540d\u5b57\u3002
\n-nn \u4e0d\u8fdb\u884c\u7aef\u53e3\u540d\u79f0\u7684\u8f6c\u6362\u3002
\n-N \u4e0d\u8f93\u51fa\u4e3b\u673a\u540d\u4e2d\u7684\u57df\u540d\u90e8\u5206\u3002\u4f8b\u5982\uff0c\u2018nic.ddn.mil\u2018\u53ea\u8f93\u51fa\u2019nic\u2018\u3002
\n-t \u5728\u8f93\u51fa\u7684\u6bcf\u4e00\u884c\u4e0d\u6253\u5370\u65f6\u95f4\u6233\u3002
\n-O \u4e0d\u8fd0\u884c\u5206\u7ec4\u5206\u7ec4\u5339\u914d\uff08packet-matching\uff09\u4ee3\u7801\u4f18\u5316\u7a0b\u5e8f\u3002
\n-P \u4e0d\u5c06\u7f51\u7edc\u63a5\u53e3\u8bbe\u7f6e\u6210\u6df7\u6742\u6a21\u5f0f\u3002
\n-q \u5feb\u901f\u8f93\u51fa\u3002\u53ea\u8f93\u51fa\u8f83\u5c11\u7684\u534f\u8bae\u4fe1\u606f\u3002
\n-r \u4ece\u6307\u5b9a\u7684\u6587\u4ef6\u4e2d\u8bfb\u53d6\u5305(\u8fd9\u4e9b\u5305\u4e00\u822c\u901a\u8fc7-w\u9009\u9879\u4ea7\u751f)\u3002
\n-S \u5c06tcp\u7684\u5e8f\u5217\u53f7\u4ee5\u7edd\u5bf9\u503c\u5f62\u5f0f\u8f93\u51fa\uff0c\u800c\u4e0d\u662f\u76f8\u5bf9\u503c\u3002
\n-s \u4ece\u6bcf\u4e2a\u5206\u7ec4\u4e2d\u8bfb\u53d6\u6700\u5f00\u59cb\u7684snaplen\u4e2a\u5b57\u8282\uff0c\u800c\u4e0d\u662f\u9ed8\u8ba4\u768468\u4e2a\u5b57\u8282\u3002
\n-T \u5c06\u76d1\u542c\u5230\u7684\u5305\u76f4\u63a5\u89e3\u91ca\u4e3a\u6307\u5b9a\u7684\u7c7b\u578b\u7684\u62a5\u6587\uff0c\u5e38\u89c1\u7684\u7c7b\u578b\u6709rpc\u8fdc\u7a0b\u8fc7\u7a0b\u8c03\u7528\uff09\u548csnmp\uff08\u7b80\u5355\u7f51\u7edc\u7ba1\u7406\u534f\u8bae\uff1b\uff09\u3002
\n-t \u4e0d\u5728\u6bcf\u4e00\u884c\u4e2d\u8f93\u51fa\u65f6\u95f4\u6233\u3002
\n-tt \u5728\u6bcf\u4e00\u884c\u4e2d\u8f93\u51fa\u975e\u683c\u5f0f\u5316\u7684\u65f6\u95f4\u6233\u3002
\n-ttt \u8f93\u51fa\u672c\u884c\u548c\u524d\u9762\u4e00\u884c\u4e4b\u95f4\u7684\u65f6\u95f4\u5dee\u3002
\n-tttt \u5728\u6bcf\u4e00\u884c\u4e2d\u8f93\u51fa\u7531date\u5904\u7406\u7684\u9ed8\u8ba4\u683c\u5f0f\u7684\u65f6\u95f4\u6233\u3002
\n-u \u8f93\u51fa\u672a\u89e3\u7801\u7684NFS\u53e5\u67c4\u3002
\n-v \u8f93\u51fa\u4e00\u4e2a\u7a0d\u5fae\u8be6\u7ec6\u7684\u4fe1\u606f\uff0c\u4f8b\u5982\u5728ip\u5305\u4e2d\u53ef\u4ee5\u5305\u62ecttl\u548c\u670d\u52a1\u7c7b\u578b\u7684\u4fe1\u606f\u3002
\n-vv \u8f93\u51fa\u8be6\u7ec6\u7684\u62a5\u6587\u4fe1\u606f\u3002
\n-w \u76f4\u63a5\u5c06\u5206\u7ec4\u5199\u5165\u6587\u4ef6\u4e2d\uff0c\u800c\u4e0d\u662f\u4e0d\u5206\u6790\u5e76\u6253\u5370\u51fa\u6765\u3002
\n\u4e09\u3001tcpdump\u7684\u8868\u8fbe\u5f0f\u4ecb\u7ecd<\/strong>
\n\u8868\u8fbe\u5f0f\u662f\u4e00\u4e2a\u6b63\u5219\u8868\u8fbe\u5f0f\uff0ctcpdump\u5229\u7528\u5b83\u4f5c\u4e3a\u8fc7\u6ee4\u62a5\u6587\u7684\u6761\u4ef6\uff0c\u5982\u679c\u4e00\u4e2a\u62a5\u6587\u6ee1\u8db3\u8868 \u8fbe\u5f0f\u7684\u6761\u4ef6\uff0c\u5219\u8fd9\u4e2a\u62a5\u6587\u5c06\u4f1a\u88ab\u6355\u83b7\u3002\u5982\u679c\u6ca1\u6709\u7ed9\u51fa\u4efb\u4f55\u6761\u4ef6\uff0c\u5219\u7f51\u7edc\u4e0a\u6240\u6709\u7684\u4fe1\u606f\u5305 \u5c06\u4f1a\u88ab\u622a\u83b7\u3002
\n\u5728\u8868\u8fbe\u5f0f\u4e2d\u4e00\u822c\u5982\u4e0b\u51e0\u79cd\u7c7b\u578b\u7684\u5173\u952e\u5b57\uff1a
\n\u5f15\u7528
\n\u7b2c\u4e00\u79cd\u662f\u5173\u4e8e\u7c7b\u578b\u7684\u5173\u952e\u5b57\uff0c<\/strong>\u4e3b\u8981\u5305\u62echost\uff0cnet\uff0cport\uff0c\u4f8b\u5982 host 210.27.48.2\uff0c \u6307\u660e 210.27.48.2\u662f\u4e00\u53f0\u4e3b\u673a\uff0cnet 202.0.0.0\u6307\u660e202.0.0.0\u662f\u4e00\u4e2a\u7f51\u7edc\u5730\u5740\uff0cport 23 \u6307\u660e\u7aef\u53e3\u53f7\u662f23\u3002\u5982\u679c\u6ca1\u6709\u6307\u5b9a\u7c7b\u578b\uff0c\u7f3a\u7701\u7684\u7c7b\u578b\u662fhost\u3002
\n\u7b2c\u4e8c\u79cd\u662f\u786e\u5b9a\u4f20\u8f93\u65b9\u5411\u7684\u5173\u952e\u5b57\uff0c<\/strong>\u4e3b\u8981\u5305\u62ecsrc\uff0cdst\uff0cdst or src\uff0cdst and src\uff0c \u8fd9\u4e9b\u5173\u952e\u5b57\u6307\u660e\u4e86\u4f20\u8f93\u7684\u65b9\u5411\u3002\u4e3e\u4f8b\u8bf4\u660e\uff0csrc 210.27.48.2 \uff0c\u6307\u660eip\u5305\u4e2d\u6e90\u5730\u5740\u662f 210.27.48.2 \uff0c dst net 202.0.0.0 \u6307\u660e\u76ee\u7684\u7f51\u7edc\u5730\u5740\u662f202.0.0.0\u3002\u5982\u679c\u6ca1\u6709\u6307\u660e \u65b9\u5411\u5173\u952e\u5b57\uff0c\u5219\u7f3a\u7701\u662fsrc or dst\u5173\u952e\u5b57\u3002
\n\u7b2c\u4e09\u79cd\u662f\u534f\u8bae\u7684\u5173\u952e\u5b57\uff0c<\/strong>\u4e3b\u8981\u5305\u62ecfddi\uff0cip\uff0carp\uff0crarp\uff0ctcp\uff0cudp\u7b49\u7c7b\u578b\u3002Fddi\u6307\u660e\u662f\u5728FDDI (\u5206\u5e03\u5f0f\u5149\u7ea4\u6570\u636e\u63a5\u53e3\u7f51\u7edc)\u4e0a\u7684\u7279\u5b9a\u7684\u7f51\u7edc\u534f\u8bae\uff0c\u5b9e\u9645\u4e0a\u5b83\u662f\u201dether\u201d\u7684\u522b\u540d\uff0cfddi\u548cether \u5177\u6709\u7c7b\u4f3c\u7684\u6e90\u5730\u5740\u548c\u76ee\u7684\u5730\u5740\uff0c\u6240\u4ee5\u53ef\u4ee5\u5c06fddi\u534f\u8bae\u5305\u5f53\u4f5cether\u7684\u5305\u8fdb\u884c\u5904\u7406\u548c\u5206\u6790\u3002 \u5176\u4ed6\u7684\u51e0\u4e2a\u5173\u952e\u5b57\u5c31\u662f\u6307\u660e\u4e86\u76d1\u542c\u7684\u5305\u7684\u534f\u8bae\u5185\u5bb9\u3002\u5982\u679c\u6ca1\u6709\u6307\u5b9a\u4efb\u4f55\u534f\u8bae\uff0c\u5219tcpdump \u5c06\u4f1a \u76d1\u542c\u6240\u6709\u534f\u8bae\u7684\u4fe1\u606f\u5305\u3002<\/p>\n
\n\u4e0b\u9762\u6211\u4eec\u4ecb\u7ecd\u51e0\u79cd\u5178\u578b\u7684tcpdump\u547d\u4ee4\u7684\u8f93\u51fa\u4fe1\u606f
\n(1) \u6570\u636e\u94fe\u8def\u5c42\u5934\u4fe1\u606f
\n<\/strong>\u4f7f\u7528\u547d\u4ee4\uff1a
\n#tcpdump --e host ICE
\nICE \u662f\u4e00\u53f0\u88c5\u6709linux\u7684\u4e3b\u673a\u3002\u5b83\u7684MAC\u5730\u5740\u662f0\uff1a90\uff1a27\uff1a58\uff1aAF\uff1a1A H219\u662f\u4e00\u53f0\u88c5\u6709Solaris\u7684SUN\u5de5\u4f5c\u7ad9\u3002\u5b83\u7684MAC\u5730\u5740\u662f8\uff1a0\uff1a20\uff1a79\uff1a5B\uff1a46\uff1b \u4e0a\u4e00\u6761\u547d\u4ee4\u7684\u8f93\u51fa\u7ed3\u679c\u5982\u4e0b\u6240\u793a\uff1a
\n\u5f15\u7528
\n21:50:12.847509 eth0 < 8:0:20:79:5b:46 0:90:27:58:af:1a ip 60: h219.33357 > ICE. telne t 0:0(0) ack 22535 win 8760 (DF)
\n21\uff1a50\uff1a12\u662f\u663e\u793a\u7684\u65f6\u95f4\uff0c 847509\u662fID\u53f7\uff0ceth0 <\u8868\u793a\u4ece\u7f51\u7edc\u63a5\u53e3eth0\u63a5\u6536\u8be5\u5206\u7ec4\uff0c eth0 >\u8868\u793a\u4ece\u7f51\u7edc\u63a5\u53e3\u8bbe\u5907\u53d1\u9001\u5206\u7ec4\uff0c 8:0:20:79:5b:46\u662f\u4e3b\u673aH219\u7684MAC\u5730\u5740\uff0c \u5b83\u8868\u660e\u662f\u4ece\u6e90\u5730\u5740H219\u53d1\u6765\u7684\u5206\u7ec4. 0:90:27:58:af:1a\u662f\u4e3b\u673aICE\u7684MAC\u5730\u5740\uff0c \u8868\u793a\u8be5\u5206\u7ec4\u7684\u76ee\u7684\u5730\u5740\u662fICE\u3002 ip \u662f\u8868\u660e\u8be5\u5206\u7ec4\u662fIP\u5206\u7ec4\uff0c60 \u662f\u5206\u7ec4\u7684\u957f\u5ea6\uff0c h219.33357 > ICE. telnet \u8868\u660e\u8be5\u5206\u7ec4\u662f\u4ece\u4e3b\u673aH219\u768433357\u7aef\u53e3\u53d1\u5f80\u4e3b\u673aICE\u7684 TELNET(23)\u7aef\u53e3\u3002 ack 22535 \u8868\u660e\u5bf9\u5e8f\u5217\u53f7\u662f222535\u7684\u5305\u8fdb\u884c\u54cd\u5e94\u3002 win 8760\u8868\u660e\u53d1 \u9001\u7a97\u53e3\u7684\u5927\u5c0f\u662f8760\u3002
\n(2) ARP\u5305\u7684tcpdump\u8f93\u51fa\u4fe1\u606f <\/strong>
\n\u4f7f\u7528\u547d\u4ee4\uff1a
\n#tcpdump arp
\n\u5f97\u5230\u7684\u8f93\u51fa\u7ed3\u679c\u662f\uff1a
\n\u5f15\u7528
\n22:32:42.802509 eth0 > arp who-has route tell ICE (0:90:27:58:af:1a)
\n22:32:42.802902 eth0 < arp reply route is-at 0:90:27:12:10:66 (0:90:27:58:af:1a)
\n22:32:42\u662f\u65f6\u95f4\u6233\uff0c 802509\u662fID\u53f7\uff0c eth0 >\u8868\u660e\u4ece\u4e3b\u673a\u53d1\u51fa\u8be5\u5206\u7ec4\uff0carp\u8868\u660e\u662fARP\u8bf7\u6c42\u5305\uff0c who-has route tell ICE\u8868\u660e\u662f\u4e3b\u673aICE\u8bf7\u6c42\u4e3b\u673aroute\u7684MAC\u5730\u5740\u3002 0:90:27:58:af:1a\u662f\u4e3b\u673a ICE\u7684MAC\u5730\u5740\u3002
\n(3) TCP\u5305\u7684\u8f93\u51fa\u4fe1\u606f <\/strong>
\n\u7528tcpdump\u6355\u83b7\u7684TCP\u5305\u7684\u4e00\u822c\u8f93\u51fa\u4fe1\u606f\u662f\uff1a
\n\u5f15\u7528
\nsrc > dst: flags data-seqno ack window urgent options
\nsrc > dst:\u8868\u660e\u4ece\u6e90\u5730\u5740\u5230\u76ee\u7684\u5730\u5740\uff0c flags\u662fTCP\u62a5\u6587\u4e2d\u7684\u6807\u5fd7\u4fe1\u606f\uff0cS \u662fSYN\u6807\u5fd7\uff0c F (FIN)\uff0c P (PUSH) \uff0c R (RST) \".\" (\u6ca1\u6709\u6807\u8bb0); data-seqno\u662f\u62a5\u6587\u4e2d\u7684\u6570\u636e \u7684\u987a\u5e8f\u53f7\uff0c ack\u662f\u4e0b\u6b21\u671f\u671b\u7684\u987a\u5e8f\u53f7\uff0c window\u662f\u63a5\u6536\u7f13\u5b58\u7684\u7a97\u53e3\u5927\u5c0f\uff0c urgent\u8868\u660e \u62a5\u6587\u4e2d\u662f\u5426\u6709\u7d27\u6025\u6307\u9488\u3002 Options\u662f\u9009\u9879\u3002
\n(4) UDP\u5305\u7684\u8f93\u51fa\u4fe1\u606f<\/strong>
\n\u7528tcpdump\u6355\u83b7\u7684UDP\u5305\u7684\u4e00\u822c\u8f93\u51fa\u4fe1\u606f\u662f\uff1a
\n\u5f15\u7528
\nroute.port1 > ICE.port2: udp lenth
\nUDP\u5341\u5206\u7b80\u5355\uff0c\u4e0a\u9762\u7684\u8f93\u51fa\u884c\u8868\u660e\u4ece\u4e3b\u673aroute\u7684port1\u7aef\u53e3\u53d1\u51fa\u7684\u4e00\u4e2aUDP\u62a5\u6587 \u5230\u4e3b\u673aICE\u7684port2\u7aef\u53e3\uff0c\u7c7b\u578b\u662fUDP\uff0c \u5305\u7684\u957f\u5ea6\u662flenth\u3002<\/p>\n
\n(1) \u60f3\u8981\u622a\u83b7\u6240\u6709210.27.48.1 \u7684\u4e3b\u673a\u6536\u5230\u7684\u548c\u53d1\u51fa\u7684\u6240\u6709\u7684\u5206\u7ec4\uff1a
\n#tcpdump host 210.27.48.1
\n(2) \u60f3\u8981\u622a\u83b7\u4e3b\u673a210.27.48.1 \u548c\u4e3b\u673a210.27.48.2\u6216210.27.48.3\u7684\u901a\u4fe1\uff0c\u4f7f\u7528\u547d\u4ee4\uff08\u6ce8\u610f\uff1a\u62ec\u53f7\u524d\u7684\u53cd\u659c\u6760\u662f\u5fc5\u987b\u7684\uff09\uff1a
\n#tcpdump host 210.27.48.1 and \\(210.27.48.2 or 210.27.48.3 \\)
\n(3) \u5982\u679c\u60f3\u8981\u83b7\u53d6\u4e3b\u673a210.27.48.1\u9664\u4e86\u548c\u4e3b\u673a210.27.48.2\u4e4b\u5916\u6240\u6709\u4e3b\u673a\u901a\u4fe1\u7684ip\u5305\uff0c\u4f7f\u7528\u547d\u4ee4\uff1a
\n#tcpdump ip host 210.27.48.1 and ! 210.27.48.2
\n(4) \u5982\u679c\u60f3\u8981\u83b7\u53d6\u4e3b\u673a192.168.228.246\u63a5\u6536\u6216\u53d1\u51fa\u7684ssh\u5305\uff0c\u5e76\u4e14\u4e0d\u8f6c\u6362\u4e3b\u673a\u540d\u4f7f\u7528\u5982\u4e0b\u547d\u4ee4\uff1a
\n#tcpdump -nn -n src host 192.168.228.246 and port 22 and tcp
\n(5) \u83b7\u53d6\u4e3b\u673a192.168.228.246\u63a5\u6536\u6216\u53d1\u51fa\u7684ssh\u5305\uff0c\u5e76\u628amac\u5730\u5740\u4e5f\u4e00\u540c\u663e\u793a\uff1a
\n# tcpdump -e src host 192.168.228.246 and port 22 and tcp -n -nn
\n(6) \u8fc7\u6ee4\u7684\u662f\u6e90\u4e3b\u673a\u4e3a192.168.0.1\u4e0e\u76ee\u7684\u7f51\u7edc\u4e3a192.168.0.0\u7684\u62a5\u5934\uff1a
\ntcpdump src host 192.168.0.1 and dst net 192.168.0.0\/24
\n(7) \u8fc7\u6ee4\u6e90\u4e3b\u673a\u7269\u7406\u5730\u5740\u4e3aXXX\u7684\u62a5\u5934\uff1a
\ntcpdump ether src 00:50:04:BA:9B and dst\u2026\u2026
\n\uff08\u4e3a\u4ec0\u4e48ether src\u540e\u9762\u6ca1\u6709host\u6216\u8005net\uff1f\u7269\u7406\u5730\u5740\u5f53\u7136\u4e0d\u53ef\u80fd\u6709\u7f51\u7edc\u55bd\uff09\u3002
\n(8) \u8fc7\u6ee4\u6e90\u4e3b\u673a192.168.0.1\u548c\u76ee\u7684\u7aef\u53e3\u4e0d\u662ftelnet\u7684\u62a5\u5934\uff0c\u5e76\u5bfc\u5165\u5230tes.t.txt\u6587\u4ef6\u4e2d\uff1a
\nTcpdump src host 192.168.0.1 and dst port not telnet -l > test.txt
\nip icmp arp rarp \u548c tcp\u3001udp\u3001icmp\u8fd9\u4e9b\u9009\u9879\u7b49\u90fd\u8981\u653e\u5230\u7b2c\u4e00\u4e2a\u53c2\u6570\u7684\u4f4d\u7f6e\uff0c\u7528\u6765\u8fc7\u6ee4\u6570\u636e\u62a5\u7684\u7c7b\u578b\u3002<\/p>\n
\ntcpdump [-nn] [-i \u63a5\u53e3] [-w \u50a8\u5b58\u6863\u540d] [-c \u6b21\u6570] [-Ae]
\n[-qX] [-r \u6587\u4ef6] [\u6240\u6b32\u6355\u83b7\u7684\u6570\u636e\u5185\u5bb9]
\n\u53c2\u6570\uff1a
\n-nn\uff0c\u76f4\u63a5\u4ee5 IP \u53ca Port Number \u663e\u793a\uff0c\u800c\u975e\u4e3b\u673a\u540d\u4e0e\u670d\u52a1\u540d\u79f0\u3002
\n-i\uff0c\u540e\u9762\u63a5\u8981\u300c\u76d1\u542c\u300d\u7684\u7f51\u7edc\u63a5\u53e3\uff0c\u4f8b\u5982 eth0, lo, ppp0 \u7b49\u7b49\u7684\u63a5\u53e3\u3002
\n-w\uff0c\u5982\u679c\u4f60\u8981\u5c06\u76d1\u542c\u6240\u5f97\u7684\u6570\u636e\u5305\u6570\u636e\u50a8\u5b58\u4e0b\u6765\uff0c\u7528\u8fd9\u4e2a\u53c2\u6570\u5c31\u5bf9\u4e86\u3002\u540e\u9762\u63a5\u6587\u4ef6\u540d\u3002
\n-c\uff0c\u76d1\u542c\u7684\u6570\u636e\u5305\u6570\uff0c\u5982\u679c\u6ca1\u6709\u8fd9\u4e2a\u53c2\u6570\uff0c tcpdump \u4f1a\u6301\u7eed\u4e0d\u65ad\u7684\u76d1\u542c\uff0c
\n\u76f4\u5230\u7528\u6237\u8f93\u5165 [ctrl]-c \u4e3a\u6b62\u3002
\n-A\uff0c\u6570\u636e\u5305\u7684\u5185\u5bb9\u4ee5 ASCII \u663e\u793a\uff0c\u901a\u5e38\u7528\u6765\u6349\u53d6 WWW \u7684\u7f51\u9875\u6570\u636e\u5305\u8d44\u6599\u3002
\n-e\uff0c\u4f7f\u7528\u8d44\u6599\u8fde\u63a5\u5c42 (OSI \u7b2c\u4e8c\u5c42) \u7684 MAC \u6570\u636e\u5305\u6570\u636e\u6765\u663e\u793a\u3002
\n-q\uff0c\u4ec5\u5217\u51fa\u8f83\u4e3a\u7b80\u77ed\u7684\u6570\u636e\u5305\u4fe1\u606f\uff0c\u6bcf\u4e00\u884c\u7684\u5185\u5bb9\u6bd4\u8f83\u7cbe\u7b80\u3002
\n-X\uff0c\u53ef\u4ee5\u5217\u51fa\u5341\u516d\u8fdb\u5236 (hex) \u4ee5\u53ca ASCII \u7684\u6570\u636e\u5305\u5185\u5bb9\uff0c\u5bf9\u4e8e\u76d1\u542c\u6570\u636e\u5305\u5185\u5bb9\u5f88\u6709\u7528\u3002
\n-r\uff0c\u4ece\u540e\u9762\u63a5\u7684\u6587\u4ef6\u5c06\u6570\u636e\u5305\u6570\u636e\u8bfb\u51fa\u6765\u3002\u90a3\u4e2a\u300c\u6587\u4ef6\u300d\u662f\u5df2\u7ecf\u5b58\u5728\u7684\u6587\u4ef6\uff0c
\n\u5e76\u4e14\u8fd9\u4e2a\u300c\u6587\u4ef6\u300d\u662f\u7531 -w \u6240\u5236\u4f5c\u51fa\u6765\u7684\u3002
\n\u6240\u6b32\u6355\u83b7\u7684\u6570\u636e\u5185\u5bb9\uff1a\u6211\u4eec\u53ef\u4ee5\u4e13\u95e8\u9488\u5bf9\u67d0\u4e9b\u901a\u4fe1\u534f\u8bae\u6216\u8005\u662f IP \u6765\u6e90\u8fdb\u884c\u6570\u636e\u5305\u6355\u83b7\u3002
\n\u90a3\u5c31\u53ef\u4ee5\u7b80\u5316\u8f93\u51fa\u7684\u7ed3\u679c\uff0c\u5e76\u53d6\u5f97\u6700\u6709\u7528\u7684\u4fe1\u606f\u3002\u5e38\u89c1\u7684\u8868\u793a\u65b9\u6cd5\u6709\u3002
\n'host foo', 'host 127.0.0.1' \uff1a\u9488\u5bf9\u5355\u53f0\u4e3b\u673a\u6765\u8fdb\u884c\u6570\u636e\u5305\u6355\u83b7\u3002
\n'net 192.168' \uff1a\u9488\u5bf9\u67d0\u4e2a\u7f51\u6bb5\u6765\u8fdb\u884c\u6570\u636e\u5305\u7684\u6355\u83b7\u3002
\n'src host 127.0.0.1' 'dst net 192.168'\uff1a\u540c\u65f6\u52a0\u4e0a\u6765\u6e90(src)\u6216\u76ee\u6807(dst)\u9650\u5236\u3002
\n'tcp port 21'\uff1a\u8fd8\u53ef\u4ee5\u9488\u5bf9\u901a\u4fe1\u534f\u8bae\u68c0\u6d4b\uff0c\u5982tcp\u3001udp\u3001arp\u3001ether \u7b49\u3002
\n\u9664\u4e86\u8fd9\u4e09\u79cd\u7c7b\u578b\u7684\u5173\u952e\u5b57\u4e4b\u5916\uff0c\u5176\u4ed6\u91cd\u8981\u7684\u5173\u952e\u5b57\u5982\u4e0b\uff1agateway, broadcast,less,
\ngreater,\u8fd8\u6709\u4e09\u79cd\u903b\u8f91\u8fd0\u7b97\uff0c\u53d6\u975e\u8fd0\u7b97\u662f 'not ' '! ', \u4e0e\u8fd0\u7b97\u662f'and','&&';\u6216\u8fd0\u7b97 \u662f'o
\nr' ,'||'\uff1b
\n\u8303\u4f8b\u4e00\uff1a\u4ee5 IP \u4e0e Port Number \u6349\u4e0b eth0 \u8fd9\u4e2a\u7f51\u5361\u4e0a\u7684\u6570\u636e\u5305\uff0c\u6301\u7eed 3 \u79d2
\n[root@linux ~]# tcpdump -i eth0 -nn
\ntcpdump: verbose output suppressed, use -v or -vv for full protocol decode
\nlistening on eth0, link-type EN10MB (Ethernet), capture size 96 bytes
\n01:33:40.41 IP 192.168.1.100.22 > 192.168.1.11.1190: P 116:232(116) ack 1 win
\n9648
\n01:33:40.41 IP 192.168.1.100.22 > 192.168.1.11.1190: P 232:364(132) ack 1 win
\n9648
\n<==\u6309\u4e0b [ctrl]-c \u4e4b\u540e\u7ed3\u675f
\n6680 packets captured\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <==\u6349\u53d6\u4e0b\u6765\u7684\u6570\u636e\u5305\u6570\u91cf
\n14250 packets received by filter\u00a0\u00a0 <==\u7531\u8fc7\u6ee4\u6240\u5f97\u7684\u603b\u6570\u636e\u5305\u6570\u91cf
\n7512 packets dropped by kernel\u00a0\u00a0\u00a0\u00a0 <==\u88ab\u6838\u5fc3\u6240\u4e22\u5f03\u7684\u6570\u636e\u5305
\n\u81f3\u4e8e\u90a3\u4e2a\u5728\u8303\u4f8b\u4e00\u6240\u4ea7\u751f\u7684\u8f93\u51fa\u4e2d\uff0c\u6211\u4eec\u53ef\u4ee5\u5927\u6982\u533a\u5206\u4e3a\u51e0\u4e2a\u5b57\u6bb5\uff0c\u73b0\u4ee5\u8303\u4f8b\u4e00\u5f53\u4e2d\u90a3\u884c\u7279\u6b8a\u5b57\u4f53\u884c\u6765\u8bf4\u660e\u4e00\u4e0b\uff1a<\/p>\n\n\n
\n \n [root@linux ~]# tcpdump -i eth0 -nn port 21\r\ntcpdump: verbose output suppressed, use -v or -vv for full protocol decode\r\nlistening on eth0, link-type EN10MB (Ethernet), capture size 96 bytes\r\n01:54:37.96 IP 192.168.1.11.1240 > 192.168.1.100.21:. ack 1 win 65535\r\n01:54:37.96 IP 192.168.1.100.21 > 192.168.1.11.1240:P 1:21(20) ack 1 win 5840\r\n01:54:38.12 IP 192.168.1.11.1240 > 192.168.1.100.21:. ack 21 win 65515\r\n01:54:42.79 IP 192.168.1.11.1240 > 192.168.1.100.21:P 1:17(16) ack 21 win 65515\r\n01:54:42.79 IP 192.168.1.100.21 > 192.168.1.11.1240: . ack 17 win 5840\r\n01:54:42.79 IP 192.168.1.100.21 > 192.168.1.11.1240: P 21:55(34) ack 17 win 5840<\/pre>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n
\n\n
\n \n [root@linux ~]# tcpdump -i lo -nn\r\n 1 tcpdump: verbose output suppressed, use -v or -vv for full protocol decode\r\n 2 listening on lo, link-type EN10MB (Ethernet), capture size 96 bytes\r\n 3 11:02:54.253777 IP 127.0.0.1.32936 > \r\n127.0.0.1.22: S 933696132:933696132(0) \r\n win 32767 \r\n 4 11:02:54.253831 IP 127.0.0.1.22 > 127.0.0.1.32936: \r\nS 920046702:920046702(0) \r\n ack 933696133 win 32767 \r\n 5 11:02:54.253871 IP 127.0.0.1.32936 > 127.0.0.1.22: . ack 1 win 8192 \r\n 6 11:02:54.272124 IP 127.0.0.1.22 > 127.0.0.1.32936: \r\nP 1:23(22) ack 1 win 8192 \r\n \r\n 7 11:02:54.272375 IP 127.0.0.1.32936 > 127.0.0.1.22: . ack 23 win 8192<\/pre>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n
\n\u00b7 \u7b2c4\u884c\u663e\u793a\u7684\u662f\u6765\u81eaServer\u7aef\uff0c\u9664\u4e86\u54cd\u5e94Client\u7aef\u4e4b\u5916\uff08ACK\uff09\uff0c\u8fd8\u5e26\u6709SYN\u4e3b\u52a8\u8054\u673a\u7684\u6807\u5fd7\u3002
\n\u00b7 \u7b2c5\u884c\u5219\u663e\u793aClient\u7aef\u54cd\u5e94Server\u786e\u5b9a\u8054\u673a\u5efa\u7acb\uff08ACK\uff09\u3002
\n\u00b7 \u7b2c6\u884c\u4ee5\u540e\u5219\u5f00\u59cb\u8fdb\u5165\u6570\u636e\u4f20\u8f93\u7684\u6b65\u9aa4\u3002<\/p>\n\n\n
\n \n [root@linux ~]# tcpdump -i lo -nn -X 'port 21'\r\n 0x0000: 4500 0048 2a28 4000 4006 1286 7f00 0001 E..H*(@.@.......\r\n 0x0010: 7f00 0001 0015 80ab 8355 2149 835c d825 .........U!I.\\.%\r\n 0x0020: 8018 2000 fe3c 0000 0101 080a 0e2e 0b67 .....<.........g\r\n 0x0030: 0e2e 0b61 3232 3020 2876 7346 5450 6420 ...a220.(vsFTPd.\r\n 0x0040: 322e 302e 3129 0d0a 2.0.1)..\r\n\r\n 0x0000: 4510 0041 d34b 4000 4006 6959 7f00 0001 E..A.K@.@.iY....\r\n 0x0010: 7f00 0001 80ab 0015 835c d825 8355 215d .........\\.%.U!]\r\n 0x0020: 8018 2000 fe35 0000 0101 080a 0e2e 1b37 .....5.........7\r\n 0x0030: 0e2e 0b67 5553 4552 2064 6d74 7361 690d ...gUSER.dmtsai.\r\n 0x0040: 0a .\r\n\r\n 0x0000: 4510 004a d34f 4000 4006 694c 7f00 0001 E..J.O@.@.iL....\r\n 0x0010: 7f00 0001 80ab 0015 835c d832 8355 217f .........\\.2.U!.\r\n 0x0020: 8018 2000 fe3e 0000 0101 080a 0e2e 3227 .....>........2'\r\n 0x0030: 0e2e 1b38 5041 5353 206d 7970 6173 7377 ...8PASS.mypassw\r\n 0x0040: 6f72 6469 7379 6f75 0d0a ordisyou..<\/pre>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n
\n\n
\n \u4f8b\u9898\uff1a\u5982\u4f55\u4f7f\u7528tcpdump\u76d1\u542c\u6765\u81eaeth0\u9002\u914d\u5361\u4e14\u901a\u4fe1\u534f\u8bae\u4e3aport 22\uff0c\u76ee\u6807\u6765\u6e90\u4e3a192.168.1.100\u7684\u6570\u636e\u5305\u8d44\u6599\uff1f<\/p>\n
\n# tcpdump
\ntcpdump: listening on fxp0
\n11:58:47.873028 202.102.245.40.netbios-ns > 202.102.245.127.netbios-ns: udp 50
\n11:58:47.974331 0:10:7b:8:3a:56 > 1:80:c2:0:0:0 802.1d ui\/C len=43
\n0000 0000 0080 0000 1007 cf08 0900 0000
\n0e80 0000 902b 4695 0980 8701 0014 0002
\n000f 0000 902b 4695 0008 00
\n11:58:48.373134 0:0:e8:5b:6d:85 > Broadcast sap e0 ui\/C len=97
\nffff 0060 0004 ffff ffff ffff ffff ffff
\n0452 ffff ffff 0000 e85b 6d85 4008 0002
\n0640 4d41 5354 4552 5f57 4542 0000 0000
\n0000 00
\n\u4f7f\u7528-i\u53c2\u6570\u6307\u5b9atcpdump\u76d1\u542c\u7684\u7f51\u7edc\u754c\u9762\uff0c\u8fd9\u5728\u8ba1\u7b97\u673a\u5177\u6709\u591a\u4e2a\u7f51\u7edc\u754c\u9762\u65f6\u975e\u5e38\u6709\u7528\uff0c
\n\u4f7f\u7528-c\u53c2\u6570\u6307\u5b9a\u8981\u76d1\u542c\u7684\u6570\u636e\u5305\u6570\u91cf\uff0c
\n\u4f7f\u7528-w\u53c2\u6570\u6307\u5b9a\u5c06\u76d1\u542c\u5230\u7684\u6570\u636e\u5305\u5199\u5165\u6587\u4ef6\u4e2d\u4fdd\u5b58<\/p>\n
\n#tcpdump host 210.27.48.1<\/p>\n
\n#tcpdump host 210.27.48.1 and \\ (210.27.48.2 or 210.27.48.3 \\)<\/p>\n
\n#tcpdump ip host 210.27.48.1 and ! 210.27.48.2<\/p>\n
\n#tcpdump tcp port 23 host 210.27.48.1<\/p>\n
\n# tcpdump udp port 123<\/p>\n
\n#tcpdump -i eth0 src host hostname<\/p>\n
\n#tcpdump -i eth0 dst host hostname<\/p>\n
\n#tcpdump -i eth0 gateway Gatewayname<\/p>\n
\n#tcpdump -i eth0 host hostname and port 80<\/p>\n
\n\uff0c\u4f7f\u7528\u547d\u4ee4\uff1a
\n#tcpdump ip host 210.27.48.1 and ! 210.27.48.2<\/p>\n
\n\uff1a\uff08\u5728\u547d\u4ee4\u884c\u4e2d\u9002\u7528\u3000\u3000\u3000\u62ec\u53f7\u65f6\uff0c\u4e00\u5b9a\u8981
\n#tcpdump host 210.27.48.1 and \\ (210.27.48.2 or 210.27.48.3 \\)<\/p>\n
\n#tcpdump ip host 210.27.48.1 and ! 210.27.48.2<\/p>\n
\n#tcpdump tcp port 23 host 210.27.48.1<\/p>\n
\n\u9664\u4e86\u8fd9\u4e09\u79cd\u7c7b\u578b\u7684\u5173\u952e\u5b57\u4e4b\u5916\uff0c\u5176\u4ed6\u91cd\u8981\u7684\u5173\u952e\u5b57\u5982\u4e0b\uff1agateway, broadcast,less,
\ngreater,\u8fd8\u6709\u4e09\u79cd\u903b\u8f91\u8fd0\u7b97\uff0c\u53d6\u975e\u8fd0\u7b97\u662f \u2018not \u2018 \u2018! \u2018, \u4e0e\u8fd0\u7b97\u662f\u2018and\u2018,\u2018&&\u2018;\u6216\u8fd0\u7b97 \u662f\u2018o
\nr\u2018 ,\u2018||\u2018\uff1b
\n\u7b2c\u4e8c\u79cd\u662f\u786e\u5b9a\u4f20\u8f93\u65b9\u5411\u7684\u5173\u952e\u5b57\uff0c\u4e3b\u8981\u5305\u62ecsrc , dst ,dst or src, dst and src ,
\n\u5982\u679c\u6211\u4eec\u53ea\u9700\u8981\u5217\u51fa\u9001\u523080\u7aef\u53e3\u7684\u6570\u636e\u5305\uff0c\u7528dst port\uff1b\u5982\u679c\u6211\u4eec\u53ea\u5e0c\u671b\u770b\u5230\u8fd4\u56de80\u7aef\u53e3\u7684\u6570\u636e\u5305\uff0c\u7528src port\u3002
\n#tcpdump \u2013i eth0 host hostname and dst port 80 \u76ee\u7684\u7aef\u53e3\u662f80
\n\u6216\u8005
\n#tcpdump \u2013i eth0 host hostname and src port 80 \u6e90\u7aef\u53e3\u662f80 \u4e00\u822c\u662f\u63d0\u4f9bhttp\u7684\u670d\u52a1\u7684\u4e3b\u673a
\n\u5982\u679c\u6761\u4ef6\u5f88\u591a\u7684\u8bdd \u8981\u5728\u6761\u4ef6\u4e4b\u524d\u52a0and \u6216 or \u6216 not
\n#tcpdump -i eth0 host ! 211.161.223.70 and ! 211.161.223.71 and dst port 80<\/p>\n
\nMay 7 20:03:46 localhost kernel: device eth0 entered promiscuous mode
\nMay 7 20:03:57 localhost kernel: device eth0 left promiscuous mode<\/p>\n