root@nethost ~]# tcpdump -i eth1.2001
tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
listening on eth1.2001, link-type EN10MB (Ethernet), capture size 65535 bytes
13:50:16.986424 IP 0.0.0.0.bootpc > 255.255.255.255.bootps: BOOTP/DHCP, Request from fa:16:3e:11:4f:3d (oui Unknown), length 280
13:50:19.992738 IP 0.0.0.0.bootpc > 255.255.255.255.bootps: BOOTP/DHCP, Request from fa:16:3e:11:4f:3d (oui Unknown), length 280