issue with nova-network - IP is getting changed whenever i am restarting my service.

Hi,

I am facing a problem with nova-network. I have configured bridge networking and I have set my IP as static but whenever I restart nova-network the IP of my bridge br100 changes from 192.168.1.100 to 192.168.1.1.

And sometimes I see the IP itself changes to 192.168.1.1 when I launch an instance. I have installed Openstack Essex on Ubuntu 12.04. Right now I am trying to do a single node installation. So both my nova-compute and nova-network are on same node. My /etc/network/interface file is as follows:

auto lo
iface lo inet loopback

auto eth0
iface eth0 inet static
address 192.168.1.100
netmask 255.255.255.0
broadcast 255.255.255.255
gateway 192.168.1.254

auto br100
iface br100 inet static
bridge_ports eth0
bridge_stp off
bridge_maxwait 0
bridge_fd 0
address 192.168.1.100
netmask 255.255.255.0
broadcast 255.255.255.255
gateway 192.168.1.254
I am having a hard time because of this IP change. Kindly provide a solution.

Thanks,
Neha Rawat