ubuntu@ubuntu:~$ sudo dhclient ra0
There is already a pid file /var/run/dhclient.pid with pid 134993416
Internet Systems Consortium DHCP Client V3.0.4
Copyright 2004-2006 Internet Systems Consortium.
All rights reserved.
For info, please visit http://www.isc.org/sw/dhcp/

Listening on LPF/ra0/00:17:3f:28:a0:bb
Sending on   LPF/ra0/00:17:3f:28:a0:bb
Sending on   Socket/fallback
DHCPDISCOVER on ra0 to 255.255.255.255 port 67 interval 4
DHCPOFFER from 192.168.0.2
DHCPREQUEST on ra0 to 255.255.255.255 port 67
DHCPACK from 192.168.0.2
bound to 192.168.0.102 -- renewal in 970641087 seconds.
ubuntu@ubuntu:~$