ubuntu@ubuntu:/media/usbdisk/home/sdg/netrek/irc$ ls -l /etc/resolv.conf
-rw-r--r-- 1 root dhcp 0 2008-07-23 17:19 /etc/resolv.conf

ubuntu@ubuntu:/media/usbdisk/home/sdg/netrek/irc$ sudo ifdown eth0 && ifup eth0 Internet Systems Consortium DHCP Client V3.0.3
Copyright 2004-2005 Internet Systems Consortium.
All rights reserved.
For info, please visit http://www.isc.org/products/DHCP

Listening on LPF/eth0/00:04:76:52:29:c2
Sending on   LPF/eth0/00:04:76:52:29:c2
Sending on   Socket/fallback
DHCPRELEASE on eth0 to 192.168.1.1 port 67
ifup: failed to open statefile /var/run/network/ifstate: Permission denied

ubuntu@ubuntu:/media/usbdisk/home/sdg/netrek/irc$ sudo ifup eth0
Internet Systems Consortium DHCP Client V3.0.3
Copyright 2004-2005 Internet Systems Consortium.
All rights reserved.
For info, please visit http://www.isc.org/products/DHCP

Listening on LPF/eth0/00:04:76:52:29:c2
Sending on   LPF/eth0/00:04:76:52:29:c2
Sending on   Socket/fallback
DHCPDISCOVER on eth0 to 255.255.255.255 port 67 interval 8
DHCPOFFER from 192.168.1.1
DHCPREQUEST on eth0 to 255.255.255.255 port 67
DHCPACK from 192.168.1.1
bound to 66.207.132.65 -- renewal in 116 seconds.

ubuntu@ubuntu:/media/usbdisk/home/sdg/netrek/irc$ ls -l /etc/resolv.conf
-rw-r--r-- 1 root dhcp 72 2008-07-23 17:22 /etc/resolv.conf