{"id":297,"date":"2021-11-04T16:27:53","date_gmt":"2021-11-04T08:27:53","guid":{"rendered":"http:\/\/47.98.165.52\/?p=297"},"modified":"2021-11-09T19:29:49","modified_gmt":"2021-11-09T11:29:49","slug":"linux%e7%b3%bb%e7%bb%9f-tcpdump-%e6%8a%93%e5%8c%85%e5%91%bd%e4%bb%a4%e4%bd%bf%e7%94%a8%e6%95%99%e7%a8%8b","status":"publish","type":"post","link":"\/?p=297","title":{"rendered":"Linux\u7cfb\u7edf tcpdump \u6293\u5305\u547d\u4ee4\u4f7f\u7528\u6559\u7a0b"},"content":{"rendered":"<p>tcpdump \u662fLinux\u7cfb\u7edf\u4e0b\u7684\u4e00\u4e2a\u5f3a\u5927\u7684\u547d\u4ee4\uff0c\u53ef\u4ee5\u5c06\u7f51\u7edc\u4e2d\u4f20\u9001\u7684\u6570\u636e\u5305\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<\/p>\n<p>\u672c\u6559\u7a0b\u5bf9tcpdump\u547d\u4ee4\u4f7f\u7528\u8fdb\u884c\u8bb2\u89e3\u8bf4\u660e\uff0c\u901a\u8fc7\u672c\u6559\u7a0b\u60a8\u53ef\u4ee5\u5b66\u4f1alinux\u7cfb\u7edf\u4e0b\u4f7f\u7528tcpdump\u547d\u4ee4\u8fdb\u884c\u7f51\u7edc\u6293\u5305\uff0c\u5b9e\u73b0\u5bf9\u6570\u636e\u5305\u8fdb\u884c\u6355\u83b7\u5206\u6790\u3002<\/p>\n<h2>tcpdump \u547d\u4ee4\u683c\u5f0f\u4ecb\u7ecd<\/h2>\n<p>\u9996\u5148\u6211\u4eec\u5bf9Linux\u7cfb\u7edf\u4e0btcpdump\u547d\u4ee4\u683c\u5f0f\u8fdb\u884c\u4e00\u4e2a\u4ecb\u7ecd\u8bf4\u660e\uff0c\u5728\u4e0b\u9762\u7684\u4f7f\u7528\u6559\u7a0b\u4e2d\u8bb2\u5230tcpdump\u547d\u4ee4\u793a\u4f8b\u65f6\uff0c\u60a8\u5c31\u53ef\u4ee5\u53c2\u8003tcpdump\u547d\u4ee4\u53c2\u6570\u8bf4\u660e\u8fdb\u884c\u5b66\u4e60\u3002<\/p>\n<p>\u8be5\u547d\u4ee4\u793a\u4f8b\u5728CentOS release 6.10 (Final) \u4e2dtcpdump\u6f14\u793a<br \/>\n\u8bed\u6cd5\uff1a<\/p>\n<pre><code class=\"language-bash\">tcpdump [ -AdDefIJKlLnNOpqRStuUvxX ] [ -B buffer_size ] [ -c count ]\n               [ -C file_size ] [ -G rotate_seconds ] [ -F file ]\n               [ -i interface ] [ -j tstamp_type ] [ -m module ] [ -M secret ]\n               [ -Q|-P in|out|inout ]\n               [ -r file ] [ -s snaplen ] [ -T type ] [ -w file ]\n               [ -W filecount ]\n               [ -E spi@ipaddr algo:secret,...  ]\n               [ -y datalinktype ] [ -z postrotate-command ] [ -Z user ]\n               [ expression ]<\/code><\/pre>\n<p>\u547d\u4ee4\u884c\u53c2\u6570\u4ecb\u7ecd\uff1a<\/p>\n<ul>\n<li>-A \u4ee5ASCII\u683c\u5f0f\u6253\u5370\u51fa\u6240\u6709\u5206\u7ec4\uff0c\u5e76\u5c06\u94fe\u8def\u5c42\u7684\u5934\u6700\u5c0f\u5316\u3002<\/li>\n<li>-c \u5728\u6536\u5230\u6307\u5b9a\u7684\u6570\u91cf\u7684\u5206\u7ec4\u540e\uff0ctcpdump\u5c31\u4f1a\u505c\u6b62\u3002<\/li>\n<li>-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<br \/>\n\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<br \/>\n\u7684\u5355\u4f4d\u662f\u5146\u5b57\u8282\uff08\u662f1,000,000\u5b57\u8282\uff0c\u800c\u4e0d\u662f1,048,576\u5b57\u8282\uff09\u3002<\/li>\n<li>-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<\/li>\n<li>-dd \u5c06\u5339\u914d\u4fe1\u606f\u5305\u7684\u4ee3\u7801\u4ee5c\u8bed\u8a00\u7a0b\u5e8f\u6bb5\u7684\u683c\u5f0f\u7ed9\u51fa\u3002<\/li>\n<li>-ddd \u5c06\u5339\u914d\u4fe1\u606f\u5305\u7684\u4ee3\u7801\u4ee5\u5341\u8fdb\u5236\u7684\u5f62\u5f0f\u7ed9\u51fa\u3002<\/li>\n<li>-D \u6253\u5370\u51fa\u7cfb\u7edf\u4e2d\u6240\u6709\u53ef\u4ee5\u7528tcpdump\u622a\u5305\u7684\u7f51\u7edc\u63a5\u53e3\u3002<\/li>\n<li>-e \u5728\u8f93\u51fa\u884c\u6253\u5370\u51fa\u6570\u636e\u94fe\u8def\u5c42\u7684\u5934\u90e8\u4fe1\u606f\u3002<\/li>\n<li>-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<\/li>\n<li>-f \u5c06\u5916\u90e8\u7684Internet\u5730\u5740\u4ee5\u6570\u5b57\u7684\u5f62\u5f0f\u6253\u5370\u51fa\u6765\u3002<\/li>\n<li>-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<\/li>\n<li>-i \u6307\u5b9a\u76d1\u542c\u7684\u7f51\u7edc\u63a5\u53e3\u3002<\/li>\n<li>-l \u4f7f\u6807\u51c6\u8f93\u51fa\u53d8\u4e3a\u7f13\u51b2\u884c\u5f62\u5f0f\u3002<\/li>\n<li>-L \u5217\u51fa\u7f51\u7edc\u63a5\u53e3\u7684\u5df2\u77e5\u6570\u636e\u94fe\u8def\u3002<\/li>\n<li>-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<\/li>\n<li>-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<\/li>\n<li>-n \u4e0d\u628a\u7f51\u7edc\u5730\u5740\u8f6c\u6362\u6210\u540d\u5b57\u3002<\/li>\n<li>-N \u4e0d\u8f93\u51fa\u4e3b\u673a\u540d\u4e2d\u7684\u57df\u540d\u90e8\u5206\u3002\u4f8b\u5982\uff0clink.linux265.com \u53ea\u8f93\u51falink\u3002<\/li>\n<li>-t \u5728\u8f93\u51fa\u7684\u6bcf\u4e00\u884c\u4e0d\u6253\u5370\u65f6\u95f4\u6233\u3002<\/li>\n<li>-O \u4e0d\u8fd0\u884c\u5206\u7ec4\u5206\u7ec4\u5339\u914d\uff08packet-matching\uff09\u4ee3\u7801\u4f18\u5316\u7a0b\u5e8f\u3002<\/li>\n<li>-P \u4e0d\u5c06\u7f51\u7edc\u63a5\u53e3\u8bbe\u7f6e\u6210\u6df7\u6742\u6a21\u5f0f\u3002<\/li>\n<li>-q \u5feb\u901f\u8f93\u51fa\u3002\u53ea\u8f93\u51fa\u8f83\u5c11\u7684\u534f\u8bae\u4fe1\u606f\u3002<\/li>\n<li>-r \u4ece\u6307\u5b9a\u7684\u6587\u4ef6\u4e2d\u8bfb\u53d6\u5305(\u8fd9\u4e9b\u5305\u4e00\u822c\u901a\u8fc7-w\u9009\u9879\u4ea7\u751f)\u3002<\/li>\n<li>-S \u5c06tcp\u7684\u5e8f\u5217\u53f7\u4ee5\u7edd\u5bf9\u503c\u5f62\u5f0f\u8f93\u51fa\uff0c\u800c\u4e0d\u662f\u76f8\u5bf9\u503c\u3002<\/li>\n<li>-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<\/li>\n<li>-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<\/li>\n<li>-t \u4e0d\u5728\u6bcf\u4e00\u884c\u4e2d\u8f93\u51fa\u65f6\u95f4\u6233\u3002<\/li>\n<li>-tt \u5728\u6bcf\u4e00\u884c\u4e2d\u8f93\u51fa\u975e\u683c\u5f0f\u5316\u7684\u65f6\u95f4\u6233\u3002<\/li>\n<li>-ttt \u8f93\u51fa\u672c\u884c\u548c\u524d\u9762\u4e00\u884c\u4e4b\u95f4\u7684\u65f6\u95f4\u5dee\u3002<\/li>\n<li>-tttt \u5728\u6bcf\u4e00\u884c\u4e2d\u8f93\u51fa\u7531date\u5904\u7406\u7684\u9ed8\u8ba4\u683c\u5f0f\u7684\u65f6\u95f4\u6233\u3002<\/li>\n<li>-u \u8f93\u51fa\u672a\u89e3\u7801\u7684NFS\u53e5\u67c4\u3002<\/li>\n<li>-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<\/li>\n<li>-vv \u8f93\u51fa\u8be6\u7ec6\u7684\u62a5\u6587\u4fe1\u606f\u3002<\/li>\n<li>-w \u76f4\u63a5\u5c06\u5206\u7ec4\u5199\u5165\u6587\u4ef6\u4e2d\uff0c\u800c\u4e0d\u662f\u4e0d\u5206\u6790\u5e76\u6253\u5370\u51fa\u6765\u3002<\/li>\n<li>-x \u4ee516\u8fdb\u5236\u6570\u5f62\u5f0f\u663e\u793a\u6bcf\u4e00\u4e2a\u62a5\u6587 (\u53bb\u6389\u94fe\u8def\u5c42\u62a5\u5934) . \u53ef\u4ee5\u663e\u793a\u8f83\u5c0f\u7684\u5b8c\u6574\u62a5\u6587, \u5426\u5219\u53ea\u663e\u793asnaplen\u4e2a\u5b57\u8282.<\/li>\n<li>-xx \u4ee516\u8fdb\u5236\u6570\u5f62\u5f0f\u663e\u793a\u6bcf\u4e00\u4e2a\u62a5\u6587\uff08\u5305\u542b\u94fe\u8def\u5c42\u5305\u5934\uff09\u3002<\/li>\n<li>-X \u4ee516\u8fdb\u5236\u548cASCII\u7801\u5f62\u5f0f\u663e\u793a\u6bcf\u4e2a\u62a5\u6587\uff08\u53bb\u6389\u94fe\u8def\u5c42\u62a5\u5934\uff09\u3002<\/li>\n<li>-XX \u4ee516\u8fdb\u5236\u548cASCII\u5417\u5f62\u5f0f\u663e\u793a\u6bcf\u4e2a\u62a5\u6587\uff08\u5305\u542b\u94fe\u8def\u5c42\u62a5\u5934\uff09\u3002<\/li>\n<li>-y \u8bbe\u7f6etcpdump \u6355\u83b7\u6570\u636e\u94fe\u8def\u5c42\u534f\u8bae\u7c7b\u578b<\/li>\n<li>-Z \u4f7ftcpdump \u653e\u5f03\u81ea\u5df1\u7684\u8d85\u7ea7\u6743\u9650(\u5982\u679c\u4ee5root\u7528\u6237\u542f\u52a8tcpdump, tcpdump\u5c06\u4f1a\u6709\u8d85\u7ea7\u7528\u6237\u6743\u9650), \u5e76\u628a\u5f53\u524dtcpdump\u7684\u7528\u6237ID\u8bbe\u7f6e\u4e3auser, \u7ec4ID\u8bbe\u7f6e\u4e3auser\u9996\u8981\u6240\u5c5e\u7ec4\u7684ID<\/li>\n<\/ul>\n<h2>tcpdump \u547d\u4ee4\u4f7f\u7528\u793a\u4f8b<\/h2>\n<p>linux\u7cfb\u7edf\u4e0b\u6267\u884ctcpdump\u547d\u4ee4\u9700\u8981root\u8d26\u53f7\u6216\u8005\u5177\u5907sudo\u6743\u9650\u7684\u8d26\u53f7\uff0c\u5426\u5219\u6267\u884ctcpdump\u547d\u4ee4\u8bf4\uff0c\u7cfb\u7edf\u4f1a\u63d0\u793atcpdump: no suitable device found\u3002<\/p>\n<p>\u5728\u4e0b\u9762\u7684\u4f8b\u5b50\u4e2d\uff0c-i eth0 \u53c2\u6570\u8868\u793a\u53ea\u6293\u53d6 eth0 \u63a5\u53e3\u6570\u636e\u5305\uff0c\u4e0d\u52a0-i eth0 \u662f\u8868\u793a\u6293\u53d6\u6240\u6709\u7684\u63a5\u53e3\u5305\u62ec lo\u3002<\/p>\n<p>01\u3001\u6293\u53d6\u6240\u6709\u7f51\u7edc\u5305\uff0c\u5e76\u5728terminal\u4e2d\u663e\u793a\u6293\u53d6\u7684\u7ed3\u679c\uff0c\u5c06\u5305\u4ee5\u5341\u516d\u8fdb\u5236\u7684\u5f62\u5f0f\u663e\u793a\u3002<br \/>\n<code>tcpdump<\/code><\/p>\n<p>02\u3001\u6293\u53d6\u6240\u6709\u7684\u7f51\u7edc\u5305\uff0c\u5e76\u5b58\u5230 result.cap \u6587\u4ef6\u4e2d\u3002<br \/>\n<code>tcpdump -w result.cap<\/code><\/p>\n<p>03\u3001\u6293\u53d6\u6240\u6709\u7684\u7ecf\u8fc7eth0\u7f51\u5361\u7684\u7f51\u7edc\u5305\uff0c\u5e76\u5b58\u5230result.cap \u6587\u4ef6\u4e2d\u3002<br \/>\n<code>tcpdump -i eth0 -w result.cap<\/code><\/p>\n<p>04\u3001\u6293\u53d6\u6e90\u5730\u5740\u662f192.168.1.100\u7684\u5305\uff0c\u5e76\u5c06\u7ed3\u679c\u4fdd\u5b58\u5230 result.cap \u6587\u4ef6\u4e2d\u3002<br \/>\n<code>tcpdump src host 192.168.1.100 -w result.cap<\/code><\/p>\n<p>05\u3001\u6293\u53d6\u5730\u5740\u5305\u542b\u662f192.168.1.100\u7684\u5305\uff0c\u5e76\u5c06\u7ed3\u679c\u4fdd\u5b58\u5230 result.cap \u6587\u4ef6\u4e2d\u3002<br \/>\n<code>tcpdump host 192.168.1.100 -w result.cap<\/code><\/p>\n<p>06\u3001\u6293\u53d6\u76ee\u7684\u5730\u5740\u5305\u542b\u662f192.168.1.100\u7684\u5305\uff0c\u5e76\u5c06\u7ed3\u679c\u4fdd\u5b58\u5230 result.cap \u6587\u4ef6\u4e2d\u3002<br \/>\n<code>tcpdump dest host 192.168.1.100 -w result.cap<\/code><\/p>\n<p>07\u3001\u6293\u53d6\u4e3b\u673a\u5730\u5740\u4e3a 192.168.1.100 \u7684\u6570\u636e\u5305<br \/>\n<code>tcpdump -i eth0 -vnn host 192.168.1.100<\/code><\/p>\n<p>08\u3001\u6293\u53d6\u5305\u542b192.168.1.0\/24\u7f51\u6bb5\u7684\u6570\u636e\u5305<br \/>\n<code>tcpdump -i eth0 -vnn net 192.168.1.0\/24<\/code><\/p>\n<p>09\u3001\u6293\u53d6\u7f51\u5361eth0\u4e0a\u6240\u6709\u5305\u542b\u7aef\u53e322\u7684\u6570\u636e\u5305<br \/>\n<code>tcpdump -i eth0 -vnn port 22<\/code><\/p>\n<p>10\u3001\u6293\u53d6\u6307\u5b9a\u534f\u8bae\u683c\u5f0f\u7684\u6570\u636e\u5305\uff0c\u534f\u8bae\u683c\u5f0f\u53ef\u4ee5\u662f\u300cudp,icmp,arp,ip\u300d\u4e2d\u7684\u4efb\u4f55\u4e00\u79cd,\u4f8b\u5982\u4ee5\u4e0b\u547d\u4ee4\uff1a<br \/>\n<code>tcpdump udp  -i eth0 -vnn<\/code><\/p>\n<p>11\u3001\u6293\u53d6\u7ecf\u8fc7 eth0 \u7f51\u5361\u7684\u6e90 ip \u662f 192.168.1.100 \u6570\u636e\u5305\uff0csrc\u53c2\u6570\u8868\u793a\u6e90\u3002<br \/>\n<code>tcpdump -i eth0 -vnn src host 192.168.1.100<\/code><\/p>\n<p>12\u3001\u6293\u53d6\u7ecf\u8fc7 eth0 \u7f51\u5361\u76ee\u7684 ip \u662f 192.168.1.100 \u6570\u636e\u5305\uff0cdst\u53c2\u6570\u8868\u793a\u76ee\u7684\u3002<br \/>\n<code>tcpdump -i eth0 -vnn dst host 192.168.1.100<\/code><\/p>\n<p>13\u3001\u6293\u53d6\u6e90\u7aef\u53e3\u662f22\u7684\u6570\u636e\u5305<br \/>\n<code>tcpdump -i eth0 -vnn src port 22<\/code><\/p>\n<p>14\u3001\u6293\u53d6\u6e90ip\u662f 192.168.1.100 \u4e14\u76ee\u7684ip\u7aef\u53e3\u662f22\u7684\u6570\u636e\u5305<br \/>\n<code>tcpdump -i eth0 -vnn src host 192.168.1.100 and dst port 22<\/code><\/p>\n<p>15\u3001\u6293\u53d6\u6e90ip192.168.1.100:22<br \/>\n<code>tcpdump -i eth0 -vnn src host 192.168.1.100 or port 22<\/code><\/p>\n<p>16\u3001\u6293\u53d6\u6e90ip192.168.1.100:22<br \/>\n<code>tcpdump -i eth0 -vnn src host 192.168.1.100 and not port 22<\/code><\/p>\n<p>17\u3001\u6293\u53d6\u6e90ip\u662f192.168.1.100\u4e14\u76ee\u7684\u7aef\u53e3\u662f22\uff0c\u6216\u6e90ip\u662f192.168.1.102\u4e14\u76ee\u7684\u7aef\u53e3\u662f80\u7684\u6570\u636e\u5305\u3002<br \/>\n<code>tcpdump -i eth0 -vnn ( src host 192.168.1.100 and dst port 22 ) or ( src host 192.168.1.102 and dst port 80 )<\/code><\/p>\n<p>18\u3001\u628a\u6293\u53d6\u7684\u6570\u636e\u5305\u8bb0\u5f55\u5b58\u5230\/tmp\/result\u6587\u4ef6\u4e2d\uff0c\u5f53\u6293\u53d6100\u4e2a\u6570\u636e\u5305\u540e\u5c31\u9000\u51fa\u7a0b\u5e8f\u3002<br \/>\n<code>tcpdump \u2013i eth0 -vnn -w \/tmp\/result -c 100<\/code><\/p>\n<p>19\u3001\u4ece\/tmp\/result\u8bb0\u5f55\u4e2d\u8bfb\u53d6tcp\u534f\u8bae\u7684\u6570\u636e\u5305<br \/>\n<code>tcpdump -i eth0  tcp  -vnn -r \/tmp\/result<\/code><\/p>\n<p>20\u3001\u60f3\u8981\u622a\u83b7\u6240\u6709192.168.1.100\u7684\u4e3b\u673a\u6536\u5230\u7684\u548c\u53d1\u51fa\u7684\u6240\u6709\u7684\u6570\u636e\u5305\uff1a<br \/>\n<code>tcpdump host 192.168.1.100<\/code><\/p>\n<p>21\u3001\u5982\u679c\u60f3\u8981\u83b7\u53d6\u4e3b\u673a192.168.1.100\u9664\u4e86\u548c\u4e3b\u673a192.168.1.101\u4e4b\u5916\u6240\u6709\u4e3b\u673a\u901a\u4fe1\u7684ip\u5305\uff0c\u4f7f\u7528\u547d\u4ee4\uff1a<br \/>\n<code>tcpdump ip host 192.168.1.100 and ! 192.168.1.101<\/code><\/p>\n<p>22\u3001\u5982\u679c\u60f3\u8981\u83b7\u53d6\u4e3b\u673a 192.168.1.100 \u63a5\u6536\u6216\u53d1\u51fa\u7684 telnet \u5305\uff0c\u4f7f\u7528\u5982\u4e0b\u547d\u4ee4\uff1a<br \/>\n<code>tcpdump tcp port 23 host 192.168.1.100<\/code><\/p>\n","protected":false},"excerpt":{"rendered":"<p>tcpdump \u662fLinux\u7cfb\u7edf\u4e0b\u7684\u4e00\u4e2a\u5f3a\u5927\u7684\u547d\u4ee4\uff0c\u53ef\u4ee5\u5c06\u7f51\u7edc\u4e2d\u4f20\u9001\u7684\u6570\u636e\u5305\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   \u2026 &#8230;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"ngg_post_thumbnail":0},"categories":[14],"tags":[],"_links":{"self":[{"href":"\/index.php?rest_route=\/wp\/v2\/posts\/297"}],"collection":[{"href":"\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=297"}],"version-history":[{"count":3,"href":"\/index.php?rest_route=\/wp\/v2\/posts\/297\/revisions"}],"predecessor-version":[{"id":304,"href":"\/index.php?rest_route=\/wp\/v2\/posts\/297\/revisions\/304"}],"wp:attachment":[{"href":"\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=297"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=297"},{"taxonomy":"post_tag","embeddable":true,"href":"\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=297"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}