Linux tcpdump 保存为 pcap 文件

说明

pcap文件可适用Wireshark软件打开。

查看网卡

ifconfig

输出

eth0      Link encap:Ethernet  HWaddr 28:6E:D4:88:C9:9F  
          inet addr:192.168.0.1  Bcast:192.168.0.255  Mask:255.255.254.0
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:20895131310 errors:0 dropped:0 overruns:0 frame:0
          TX packets:20688408611 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:9538158933013 (8.6 TiB)  TX bytes:7270083406746 (6.6 TiB)
          Interrupt:236 

lo        Link encap:Local Loopback  
          inet addr:127.0.0.1  Mask:255.0.0.0
          UP LOOPBACK RUNNING  MTU:65536  Metric:1
          RX packets:13660569339 errors:0 dropped:0 overruns:0 frame:0
          TX packets:13660569339 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0 
          RX bytes:2698474116062 (2.4 TiB)  TX bytes:2698474116062 (2.4 TiB)

-w 参数

注意：sudo或root用户执行tcpdump。

抓取eht0的数据包

tcpdump -i eth0 -w xxx.pcap

抓取eht0且host为192.168.0.2的数据包

tcpdump -i eth0 host 192.168.0.2 -w xxx.pcap

抓取eht0且host为192.168.0.2且端口为8080的数据包

tcpdump -i eth0 host 192.168.0.2 and port 8080 -w xxx.pcap