Linux tcpdump命令
非常强大的工具,只有root账号可以使用,是安全和黑客入侵必备工具
tcpdump: verbose output suppressed, use -v[v]... for full protocol decode
listening on eth0, link-type EN10MB (Ethernet), snapshot length 262144 bytes
22:29:28.233024 IP 119.91.211.25.34064 > iZ2ze1w1u469cd5g30t9kbZ.redis: Flags [P.], seq 3140939499:3140939515, ack 2062750881, win 229, options [nop,nop,TS val 4190692450 ecr 2617535721], length 16: RESP "auth ********"
22:29:28.233134 IP iZ2ze1w1u469cd5g30t9kbZ.redis > 119.91.211.25.34064: Flags [P.], seq 1:6, ack 16, win 510, options [nop,nop,TS val 2617552497 ecr 4190692450], length 5: RESP "OK"
22:29:28.269708 IP 119.91.211.25.34064 > iZ2ze1w1u469cd5g30t9kbZ.redis: Flags [.], ack 6, win 229, options [nop,nop,TS val 4190692487 ecr 2617552497], length 0
^[^A^C
3 packets captured
3 packets received by filter
0 packets dropped by kernel
Linux tcpdump命令用于倾倒网络传输数据。
执行tcpdump指令可列出经过指定网络界面的数据包文件头,在Linux操作系统中,你必须是系统管理员。
语法
tcpdump [-adeflnNOpqStvx][-c<数据包数目>][-dd][-ddd][-F<表达文件>][-i<网络界面>][-r<数据包文件>][-s<数据包大小>][-tt][-T<数据包类型>][-vv][-w<数据包文件>][输出数据栏位]
参数说明:
- -a 尝试将网络和广播地址转换成名称。
- -c<数据包数目> 收到指定的数据包数目后,就停止进行倾倒操作。
- -d 把编译过的数据包编码转换成可阅读的格式,并倾倒到标准输出。
- -dd 把编译过的数据包编码转换成C语言的格式,并倾倒到标准输出。
- -ddd 把编译过的数据包编码转换成十进制数字的格式,并倾倒到标准输出。
- -e 在每列倾倒资料上显示连接层级的文件头。
- -f 用数字显示网际网络地址。
- -F<表达文件> 指定内含表达方式的文件。
- -i<网络界面> 使用指定的网络截面送出数据包。
- -l 使用标准输出列的缓冲区。
- -n 不把主机的网络地址转换成名字。
- -N 不列出域名。
- -O 不将数据包编码最佳化。
- -p 不让网络界面进入混杂模式。
- -q 快速输出,仅列出少数的传输协议信息。
- -r<数据包文件> 从指定的文件读取数据包数据。
- -s<数据包大小> 设置每个数据包的大小。
- -S 用绝对而非相对数值列出TCP关联数。
- -t 在每列倾倒资料上不显示时间戳记。
- -tt 在每列倾倒资料上显示未经格式化的时间戳记。
- -T<数据包类型> 强制将表达方式所指定的数据包转译成设置的数据包类型。
- -v 详细显示指令执行过程。
- -vv 更详细显示指令执行过程。
- -x 用十六进制字码列出数据包资料。
- -w<数据包文件> 把数据包数据写入指定的文件。
实例
显示TCP包信息
# tcpdump
tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
listening on eth0, link-type EN10MB (Ethernet), capture size 96 bytes
23:35:55.129998 IP 192.168.0.3.ssh > 192.168.0.1.2101: P 148872068:148872168(100) ack 4184371747 win 2100
23:35:55.182357 IP 192.168.0.1.2101 > 192.168.0.3.ssh: . ack 100 win 64240
23:35:55.182397 IP 192.168.0.3.ssh > 192.168.0.1.2101: P 100:200(100) ack 1 win 2100
23:35:55.131713 IP 192.168.0.3.32804 > dns2.cs.hn.cn.domain: 50226+ PTR? 1.0.168.192.in-addr.arpa. (42)
23:35:55.131896 PPPoE [ses 0x1cb0] IP 118.250.6.85.64215 > dns2.cs.hn.cn.domain: 50226+ PTR? 1.0.168.192.in-addr.arpa. (42)
23:35:55.154238 PPPoE [ses 0x1cb0] IP dns2.cs.hn.cn.domain > 118.250.6.85.64215: 50226 NXDomain 0/0/0 (42)
23:35:55.156298 IP dns2.cs.hn.cn.domain > 192.168.0.3.32804: 50226 NXDomain 0/0/0 (42)
23:35:55.159292 IP 192.168.0.3.32804 > dns2.cs.hn.cn.domain: 30304+ PTR? 3.0.168.192.in-addr.arpa. (42)
23:35:55.159449 PPPoE [ses 0x1cb0] IP 118.250.6.85.64215 > dns2.cs.hn.cn.domain: 30304+ PTR? 3.0.168.192.in-addr.arpa. (42)
23:35:55.179816 PPPoE [ses 0x1cb0] IP dns2.cs.hn.cn.domain > 118.250.6.85.64215: 30304 NXDomain 0/0/0 (42)
23:35:55.181279 IP dns2.cs.hn.cn.domain > 192.168.0.3.32804: 30304 NXDomain 0/0/0 (42)
23:35:55.181806 IP 192.168.0.3.ssh > 192.168.0.1.2101: P 200:268(68) ack 1 win 2100
23:35:55.182177 IP 192.168.0.1.2101 > 192.168.0.3.ssh: . ack 268 win 64198
23:35:55.182677 IP 192.168.0.3.32804 > dns2.cs.hn.cn.domain: 43983+ PTR? 112.96.103.202.in-addr.arpa. (45)
23:35:55.182807 PPPoE [ses 0x1cb0] IP 118.250.6.85.64215 > dns2.cs.hn.cn.domain: 43983+ PTR? 112.96.103.202.in-addr.arpa. (45)
23:35:55.183055 IP 192.168.0.3.ssh > 192.168.0.1.2101: P 268:352(84) ack 1 win 2100
23:35:55.201096 PPPoE [ses 0x1cb0] IP dns2.cs.hn.cn.domain > 118.250.6.85.64215: 43983 1/0/0 (72)
23:35:55.203087 IP dns2.cs.hn.cn.domain > 192.168.0.3.32804: 43983 1/0/0 (72)
23:35:55.204666 IP 192.168.0.3.ssh > 192.168.0.1.2101: P 352:452(100) ack 1 win 2100
23:35:55.204852 IP 192.168.0.1.2101 > 192.168.0.3.ssh: . ack 452 win 64152
23:35:55.205305 IP 192.168.0.3.ssh > 192.168.0.1.2101: P 452:520(68) ack 1 win 2100
23:35:55.205889 IP 192.168.0.3.32804 > dns2.cs.hn.cn.domain: 9318+ PTR? 85.6.250.118.in-addr.arpa. (43)
23:35:55.206071 PPPoE [ses 0x1cb0] IP 118.250.6.85.64215 > dns2.cs.hn.cn.domain: 9318+ PTR? 85.6.250.118.in-addr.arpa. (43)
23:35:55.215338 PPPoE [ses 0x1cb0] IP 115.238.1.45.3724 > 118.250.6.85.64120: P 2392751922:2392751987(65) ack 2849759785 win 54
23:35:55.216273 IP 115.238.1.45.3724 > 192.168.0.65.2057: P 2392751922:2392751987(65) ack 2849759785 win 54
23:35:55.329204 IP 192.168.0.1.2101 > 192.168.0.3.ssh: . ack 520 win 64135
23:35:55.458214 IP 192.168.0.65.2057 > 115.238.1.45.3724: . ack 65 win 32590
23:35:55.458221 PPPoE [ses 0x1cb0] IP 118.250.6.85.64120 > 115.238.1.45.3724: . ack 65 win 32590
23:35:55.708228 PPPoE [ses 0x1cb0] IP 115.238.1.45.3724 > 118.250.6.85.64120: P 65:118(53) ack 1 win 54
23:35:55.710213 IP 115.238.1.45.3724 > 192.168.0.65.2057: P 65:118(53) ack 1 win 54
23:35:55.865151 IP 192.168.0.65.2057 > 115.238.1.45.3724: . ack 118 win 32768
23:35:55.865157 PPPoE [ses 0x1cb0] IP 118.250.6.85.64120 > 115.238.1.45.3724: . ack 118 win 32768
23:35:56.242805 IP 192.168.0.65.2057 > 115.238.1.45.3724: P 1:25(24) ack 118 win 32768
23:35:56.242812 PPPoE [ses 0x1cb0] IP 118.250.6.85.64120 > 115.238.1.45.3724: P 1:25(24) ack 118 win 32768
23:35:56.276816 PPPoE [ses 0x1cb0] IP 115.238.1.45.3724 > 118.250.6.85.64120: . ack 25 win 54
23:35:56.278240 IP 115.238.1.45.3724 > 192.168.0.65.2057: . ack 25 win 54
23:35:56.349747 PPPoE [ses 0x1cb0] IP 115.238.1.45.3724 > 118.250.6.85.64120: P 118:159(41) ack 25 win 54
23:35:56.351780 IP 115.238.1.45.3724 > 192.168.0.65.2057: P 118:159(41) ack 25 win 54
23:35:56.400051 PPPoE [ses 0x1cb0] IP 119.147.18.44.8000 > 118.250.6.85.4000: UDP, length 79
23:35:56.475050 IP 192.168.0.65.2057 > 115.238.1.45.3724: . ack 159 win 32762
23:35:56.475063 PPPoE [ses 0x1cb0] IP 118.250.6.85.64120 > 115.238.1.45.3724: . ack 159 win 32762
23:35:56.508968 PPPoE [ses 0x1cb0] IP 115.238.1.45.3724 > 118.250.6.85.64120: P 159:411(252) ack 25 win 54
23:35:56.510182 IP 115.238.1.45.3724 > 192.168.0.65.2057: P 159:411(252) ack 25 win 54
23:35:56.592028 PPPoE [ses 0x1cb0] IP 117.136.2.43.38959 > 118.250.6.85.63283: UDP, length 36
44 packets captured
76 packets received by filter
0 packets dropped by kernel
显示指定数量包
# tcpdump -c 20
tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
listening on eth0, link-type EN10MB (Ethernet), capture size 96 bytes
23:36:28.949538 IP 192.168.0.3.ssh > 192.168.0.1.2101: P 148875984:148876020(36) ack 4184373187 win 2100
23:36:28.994325 IP 192.168.0.1.2101 > 192.168.0.3.ssh: . ack 36 win 64020
23:36:28.994368 IP 192.168.0.3.ssh > 192.168.0.1.2101: P 36:72(36) ack 1 win 2100
23:36:28.950779 IP 192.168.0.3.32804 > dns2.cs.hn.cn.domain: 18242+ PTR? 1.0.168.192.in-addr.arpa. (42)
23:36:28.950948 PPPoE [ses 0x1cb0] IP 118.250.6.85.64215 > dns2.cs.hn.cn.domain: 18242+ PTR? 1.0.168.192.in-addr.arpa. (42)
23:36:28.960105 PPPoE [ses 0x1cb0] IP 222.82.119.41.13594 > 118.250.6.85.63283: UDP, length 36
23:36:28.962192 IP 222.82.119.41.13594 > 192.168.0.65.13965: UDP, length 36
23:36:28.963118 IP 192.168.0.65.13965 > 222.82.119.41.13594: UDP, length 34
23:36:28.963123 PPPoE [ses 0x1cb0] IP 118.250.6.85.63283 > 222.82.119.41.13594: UDP, length 34
23:36:28.970185 PPPoE [ses 0x1cb0] IP dns2.cs.hn.cn.domain > 118.250.6.85.64215: 18242 NXDomain 0/0/0 (42)
23:36:28.970413 IP dns2.cs.hn.cn.domain > 192.168.0.3.32804: 18242 NXDomain 0/0/0 (42)
23:36:28.972352 IP 192.168.0.3.32804 > dns2.cs.hn.cn.domain: 17862+ PTR? 3.0.168.192.in-addr.arpa. (42)
23:36:28.972474 PPPoE [ses 0x1cb0] IP 118.250.6.85.64215 > dns2.cs.hn.cn.domain: 17862+ PTR? 3.0.168.192.in-addr.arpa. (42)
23:36:28.982287 PPPoE [ses 0x1cb0] IP 121.12.131.163.13109 > 118.250.6.85.63283: UDP, length 27
23:36:28.984162 IP 121.12.131.163.13109 > 192.168.0.65.13965: UDP, length 27
23:36:28.985021 IP 192.168.0.65.13965 > 121.12.131.163.13109: UDP, length 103
23:36:28.985027 PPPoE [ses 0x1cb0] IP 118.250.6.85.63283 > 121.12.131.163.13109: UDP, length 103
23:36:28.991919 PPPoE [ses 0x1cb0] IP dns2.cs.hn.cn.domain > 118.250.6.85.64215: 17862 NXDomain 0/0/0 (42)
23:36:28.993142 IP dns2.cs.hn.cn.domain > 192.168.0.3.32804: 17862 NXDomain 0/0/0 (42)
23:36:28.993574 IP 192.168.0.3.ssh > 192.168.0.1.2101: P 72:140(68) ack 1 win 2100
20 packets captured
206 packets received by filter
129 packets dropped by kernel
精简显示
# tcpdump -c 10 -q //精简模式显示 10个包
tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
listening on eth0, link-type EN10MB (Ethernet), capture size 96 bytes
23:43:05.792280 IP 192.168.0.3.ssh > 192.168.0.1.2101: tcp 36
23:43:05.842115 IP 192.168.0.1.2101 > 192.168.0.3.ssh: tcp 0
23:43:05.845074 IP 115.238.1.45.3724 > 192.168.0.65.2057: tcp 0
23:43:05.907155 IP 192.168.0.3.ssh > 192.168.0.1.2101: tcp 36
23:43:05.793880 IP 192.168.0.3.32804 > dns2.cs.hn.cn.domain: UDP, length 42
23:43:05.794076 PPPoE [ses 0x1cb0] IP 118.250.6.85.64219 > dns2.cs.hn.cn.domain: UDP, length 42
23:43:05.811127 PPPoE [ses 0x1cb0] IP dns2.cs.hn.cn.domain > 118.250.6.85.64219: UDP, length 42
23:43:05.814764 IP dns2.cs.hn.cn.domain > 192.168.0.3.32804: UDP, length 42
23:43:05.816404 IP 192.168.0.3.32804 > dns2.cs.hn.cn.domain: UDP, length 42
23:43:05.816545 PPPoE [ses 0x1cb0] IP 118.250.6.85.64219 > dns2.cs.hn.cn.domain: UDP, length 42
10 packets captured
39 packets received by filter
0 packets dropped by kernel
转换克阅读格式
# tcpdump -d
(000) ret #96
转换成十进制格式
# tcpdump -ddd
1
6 0 0 96
标签:23,ack,IP,192.168,命令,35,Linux,win,tcpdump
From: https://www.cnblogs.com/hcgk/p/17311601.html