tcpdump

tcpdump option

tcpdump is one of tool for investigating network traffic on *nix OS.

[root@hiyokotech hiyoko]# tcpdump
listening on eth0, link-type EN10MB (Ethernet), capture size 262144 bytes
13:27:44.650672 IP ip-172-31-xx-xxx.us-west-1.compute.internal.ssh > xxx-xxx-93-219.pkes.anet.xx: Flags [P.], seq 905759057:905759173, ack 2631534486, win 678, length 116

-X packet details

-A text dump