Debian network bridge configuration - /etc/network/interfaces
- by Mathias
I'm running a Lenny Xen dom0 hosting multiple virtual machines in a routed IP setup. To get an additional private subnet, I created the bridge xenbr0 in the dom0 with the following commands:
brctl addbr xenbr0
ifconfig xenbr0 10.0.0.1 netmask 255.255.255.0
ifconfig xenbr0 up
This works as expected, and domU interfaces are added to the bridge by Xen on VM start. My only problem is: how the heck do i specify this configuration in /etc/network/interfaces that it remains permanent and the bridge is available after a reboot? I tried the following config as found on a lot of tutorials:
auto xenbr0
iface xenbr0 inet static
address 10.0.0.1
netmask 255.255.255.0
network 10.0.0.0
broadcast 10.0.0.255
bridge_stp no
I get 2 different errors, depending on if the bridge already exists or not. If it doesn't exist:
root@dom0:~# brctl show
bridge name bridge id STP enabled interfaces
root@dom0:~# /etc/init.d/networking restart
Reconfiguring network interfaces...if-up.d/mountnfs[eth0]: waiting for interface xenbr0 before doing NFS mounts (warning).
SIOCSIFADDR: No such device
xenbr0: ERROR while getting interface flags: No such device
SIOCSIFNETMASK: No such device
SIOCSIFBRDADDR: No such device
xenbr0: ERROR while getting interface flags: No such device
xenbr0: ERROR while getting interface flags: No such device
Failed to bring up xenbr0.
done.
And if it exists:
root@dom0:~# brctl show
bridge name bridge id STP enabled interfaces
xenbr0 8000.000000000000 no
root@dom0:~# /etc/init.d/networking restart
Reconfiguring network interfaces...if-up.d/mountnfs[eth0]: waiting for interface xenbr0 before doing NFS mounts (warning).
RTNETLINK answers: File exists
Failed to bring up xenbr0.
done.
Could anyone point me in the right direction please? The bridge works fine when created manually, i just need the right config file entries. The most tutorials I found add some devices to the bridge in the config, is that maybe the problem why it is not working? I don't have any interfaces I want to add to the bridge on creation as they get added later on VM start...
Thanks,
Mathias
