I'm running Ubuntu 11.10 server as the Host OS. I have network bridging configured. I have migrated a physical Ubuntu 10.04 machine as a Guest OS on the server mentioned above. The Physical IP of the host is

My question is related to the IP address of the Guest OS. In the guest I have a /etc/network/interfaces configured setting the IP as a static IP but according to ifconfig this Guest is assigned (This is in the DHCP range administered on the LAN router).

So why does this machine ignore it's settings in the /etc/network/interfaces and instead use a DHCP IP?