Linux环境下使用tcpdump抓包与下载

（1）报文抓取

tcpdump -i eno5 host 10.8.12.154 -w /test.cap

-i：抓取的网卡

host：目的地址

-w：生成的文件存放路径

Ctrl+c 结束抓包，抓取的报文存放在/的test.cap下

（2）报文获取

方法1：使用scp命令，将当前设备上/root下的set_fxs_port.cap文件传输到IP为10.8.12.90设备/mnt/hfs1目录下

[root@genewDB ~]# ll
total 20
-rw-r--r--  1 tcpdump tcpdump   24 Sep  7 08:17 B1205F.pcap
drwxr-xr-x  2 root    root       6 May  6 22:19 Desktop
drwxr-xr-x  2 root    root       6 May  6 22:19 Documents
drwxr-xr-x  2 root    root       6 May  6 22:19 Downloads
drwxr-xr-x  2 root    root       6 May  6 22:19 Music
drwxrwxr-x  3 root    root      19 Aug  9 11:38 Netman4000
drwxr-xr-x. 3 root    root      17 May  4 08:50 Orgin_file
drwxr-xr-x  2 root    root       6 May  6 22:19 Pictures
drwxr-xr-x  2 root    root       6 May  6 22:19 Public
-rw-r--r--  1 tcpdump tcpdump 1501 Sep 11 06:07 set_fxs_port.cap
-rw-r--r--  1 tcpdump tcpdump  512 Sep 11 06:03 set+fxs_port.cap
drwxr-xr-x  2 root    root       6 May  6 22:19 Templates
-rw-r--r--  1 tcpdump tcpdump 7167 Aug 17 18:15 tongji.cap
drwxr-xr-x  2 root    root       6 May  6 22:19 Videos
[root@genewDB ~]# pwd
/root
[root@genewDB ~]# scp /root/set_fxs_port.cap [email protected]:/mnt/hfs1/set_fxs_port.cap
[email protected]'s password: 
set_fxs_port.cap                                                                         100% 1501     1.5KB/s   00:00

方法2：使用SSH Secure File Transfer Client下载到本地；