CentOS中使用tcpdump抓包

安装：

 

yum install tcpdump

 

命令使用：

监听特定网卡

tcpdump

抓取第一块网卡所有数据包

 

[root@server110 tcpdump]# tcpdump
tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
listening on eth0, link-type EN10MB (Ethernet), capture size 65535 bytes
1514.441562 IP server110.ssh > 18.16.202.169.cvd: Flags [P.], seq 2956277183:2956277391, ack 2178083060, win 336, length 208
1514.442088 IP server110.34562 > ns-px.online.sh.cn.domain: 34223+ PTR? 169.202.16.18.in-addr.arpa. (44)
1514.486822 IP 18.16.202.169.cvd > server110.ssh: Flags [.], ack 208, win 16419, length 0
1514.692932 IP ns-px.online.sh.cn.domain > server110.34562: 34223 NXDomain 0/1/0 (116)
1514.693416 IP server110.57017 > ns-px.online.sh.cn.domain: 12369+ PTR? 5.209.96.202.in-addr.arpa. (43)
1514.693577 IP server110.ssh > 18.16.202.169.cvd: Flags [P.], seq 208:400, ack 1, win 336, length 192
1514.695254 IP ns-px.online.sh.cn.domain > server110.57017: 12369 1/0/0 PTR ns-px.online.sh.cn. (75)
1514.695519 IP server110.ssh > 18.16.202.169.cvd: Flags [P.], seq 400:656, ack 1, win 336, length 256
1514.696577 IP server110.ssh > 18.16.202.169.cvd: Flags [P.], seq 656:1232, ack 1, win 336, length 576
1514.697564 IP server110.ssh > 18.16.202.169.cvd: Flags [P.], seq 1232:1392, ack 1, win 336, length 160
1514.698563 IP server110.ssh > 18.16.202.169.cvd: Flags [P.], seq 1392:1552, ack 1, win 336, length 160

 

tcpdump -i 抓取某一块网卡数据包

 

[root@server110 tcpdump]# ifconfig
eth0      Link encap:Ethernet  HWaddr 520005:94  
          inet addr:18.16.200.110  Bcast:18.16.200.255  Mask:255.255.255.0
          inet6 addr: fe80:ff594/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:50017569 errors:0 dropped:0 overruns:0 frame:0
          TX packets:27403502 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:21017784488 (19.5 GiB)  TX bytes:3969196772 (3.6 GiB)

lo        Link encap:Local Loopback  
          inet addr:127.0.0.1  Mask:255.0.0.0
          inet6 addr: ::1/128 Scope:Host
          UP LOOPBACK RUNNING  MTU:65536  Metric:1
          RX packets:191873 errors:0 dropped:0 overruns:0 frame:0
          TX packets:191873 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0 
          RX bytes:31953071 (30.4 MiB)  TX bytes:31953071 (30.4 MiB)

[root@server110 tcpdump]# tcpdump -i eth0
tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
listening on eth0, link-type EN10MB (Ethernet), capture size 65535 bytes
1543.529881 IP server110.ssh > 18.16.202.169.cvd: Flags [P.], seq 2956715807:2956716015, ack 2178087524, win 336, length 208
1543.530636 IP 18.16.202.169.cvd > server110.ssh: Flags [.], ack 208, win 16422, length 0
1543.530732 IP server110.50508 > ns-px.online.sh.cn.domain: 42810+ PTR? 169.202.16.18.in-addr.arpa. (44)
1543.533748 IP ns-px.online.sh.cn.domain > server110.50508: 42810 NXDomain 0/1/0 (116)
1543.534054 IP server110.37348 > ns-px.online.sh.cn.domain: 43151+ PTR? 5.209.96.202.in-addr.arpa. (43)
1543.534537 IP server110.ssh > 18.16.202.169.cvd: Flags [P.], seq 208:496, ack 1, win 336, length 288
1543.540551 IP ns-px.online.sh.cn.domain > server110.37348: 43151 1/0/0 PTR ns-px.online.sh.cn. (75)
1543.541536 IP server110.ssh > 18.16.202.169.cvd: Flags [P.], seq 496:1072, ack 1, win 336, length 576
1543.542319 IP 18.16.202.169.cvd > server110.ssh: Flags [.], ack 1072, win 16425, length 0
1543.542529 IP server110.ssh > 18.16.202.169.cvd: Flags [P.], seq 1072:1328, ack 1, win 336, length 256
1543.543545 IP server110.ssh > 18.16.202.169.cvd: Flags [P.], seq 1328:1488, ack 1, win 336, length 160

 

监听特定主机

 

[root@server110 tcpdump]# tcpdump  host 18.16.202.169
tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
listening on eth0, link-type EN10MB (Ethernet), capture size 65535 bytes
1616.334596 IP server110.ssh > 18.16.202.169.cvd: Flags [P.], seq 2957160543:2957160751, ack 2178097380, win 336, length 208
1616.375768 IP 18.16.202.169.cvd > server110.ssh: Flags [.], ack 208, win 16425, length 0
1616.539595 IP server110.ssh > 18.16.202.169.cvd: Flags [P.], seq 208:496, ack 1, win 336, length 288
1616.540553 IP server110.ssh > 18.16.202.169.cvd: Flags [P.], seq 496:656, ack 1, win 336, length 160
1616.541564 IP server110.ssh > 18.16.202.169.cvd: Flags [P.], seq 656:816, ack 1, win 336, length 160
1616.541731 IP 18.16.202.169.cvd > server110.ssh: Flags [.], ack 656, win 16423, length 0
1616.542572 IP server110.ssh > 18.16.202.169.cvd: Flags [P.], seq 816:1072, ack 1, win 336, length 256
1616.543565 IP server110.ssh > 18.16.202.169.cvd: Flags [P.], seq 1072:1232, ack 1, win 336, length 160

 

特定来源

 

[root@server110 tcpdump]# tcpdump src host 18.16.202.169
tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
listening on eth0, link-type EN10MB (Ethernet), capture size 65535 bytes
1630.681395 IP 18.16.202.169.cvd > server110.ssh: Flags [.], ack 2957168815, win 16420, length 0
1630.791328 IP 18.16.202.169.cvd > server110.ssh: Flags [.], ack 161, win 16420, length 0
1630.833394 IP 18.16.202.169.cvd > server110.ssh: Flags [.], ack 321, win 16419, length 0

 

特定目标地址

 

[root@server110 tcpdump]# tcpdump dst host 18.16.202.169
tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
listening on eth0, link-type EN10MB (Ethernet), capture size 65535 bytes
1627.404603 IP server110.ssh > 18.16.202.169.cvd: Flags [P.], seq 2958878511:2958878719, ack 2178100804, win 336, length 208
1627.408521 IP server110.ssh > 18.16.202.169.cvd: Flags [P.], seq 208:400, ack 1, win 336, length 192
1627.409530 IP server110.ssh > 18.16.202.169.cvd: Flags [P.], seq 400:560, ack 1, win 336, length 160

 

监听特定端口

 

[root@server110 tcpdump]# tcpdump port 8083 -vv
tcpdump: listening on eth0, link-type EN10MB (Ethernet), capture size 65535 bytes
1631.361199 IP (tos 0x0, ttl 127, id 19231, offset 0, flags [DF], proto TCP (6), length 52)
    18.16.202.169.14626 > server110.us-srv: Flags [S], cksum 0x3315 (correct), seq 2299766793, win 64240, options [mss 1460,nop,wscale 8,nop,nop,sackOK], length 0
1631.361264 IP (tos 0x0, ttl 64, id 0, offset 0, flags [DF], proto TCP (6), length 52)
    server110.us-srv > 18.16.202.169.14626: Flags [S.], cksum 0x4b86 (correct), seq 1167811532, ack 2299766794, win 14600, options [mss 1460,nop,nop,sackOK,nop,wscale 7], length 0
1631.361594 IP (tos 0x0, ttl 127, id 19232, offset 0, flags [DF], proto TCP (6), length 40)
    18.16.202.169.14626 > server110.us-srv: Flags [.], cksum 0xa54c (correct), seq 1, ack 1, win 8212, length 0

 

监听tcp协议，并加数据包写入abc.cap

 

[root@server110 tcpdump]# tcpdump tcp port 8083 -w  ./abc.cap
tcpdump: listening on eth0, link-type EN10MB (Ethernet), capture size 65535 bytes
^C15 packets captured
15 packets received by filter
0 packets dropped by kernel

 

总共15条数据，其中只包含tcp,http格式的数据

稍微复杂例子

 

tcpdump tcp -i eth1 -t -s 0 -c 100 and dst port ! 22 and src net 192.168.1.0/24 -w ./target.cap

 

tcp: ip icmp arp rarp 和 tcp、udp、icmp这些选项等都要放到第一个参数的位置，用来过滤数据报的类型

-i eth1 : 只抓经过接口eth1的包

-t : 不显示时间戳

-s 0 : 抓取数据包时默认抓取长度为68字节。加上-S 0 后可以抓到完整的数据包

-c 100 : 只抓取100个数据包

dst port ! 22 : 不抓取目标端口是22的数据包

src net 192.168.1.0/24 : 数据包的源网络地址为192.168.1.0/24

-w ./target.cap : 保存成cap文件，方便用ethereal(即wireshark)分析

链接：https://www.cnblogs.com/hongdada/p/10565898.html