janne@kubuntu:~$ sudo dhclient eth0
[sudo] password for janne:
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/eth0/00:19:db:4f:0a:d4
Sending on   LPF/eth0/00:19:db:4f:0a:d4
Sending on   Socket/fallback
DHCPDISCOVER on eth0 to 255.255.255.255 port 67 interval 4
DHCPOFFER from 91.145.78.1
DHCPREQUEST on eth0 to 255.255.255.255 port 67
DHCPACK from 91.145.78.1
bound to 91.145.79.25 -- renewal in 1375 seconds.