Debian network bridge configuration - /etc/network/interfaces
Solution 1
You seem to miss the most important line:
auto xenbr0
iface xenbr0 inet static
bridge_ports eth0 eth4 eth7 # bridge traffic between these interfaces
bridge_stp no
address 10.0.0.1
netmask 255.255.255.0
network 10.0.0.0
broadcast 10.0.0.255
man
says:
If you need to specify the interfaces more flexibly, you can use
the following syntax (most useful on a Xen dom0):
bridge_ports regex (eth|vif).*
This means to evaluate (as in egrep(1)) the expressions that follow after "regex".
Solution 2
How about a script that runs after startup to perform the commands you want?
Related videos on Youtube
maff
Updated on September 17, 2022Comments
-
maff almost 2 years
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
-
M_1 about 14 yearsHave you checked the Xen mailing list and wiki.xensource.com/xenwiki/XenNetworking ?
-
maff about 14 yearsSure, the setup works as desired. I just need to know how to setup the bridge in /etc/network/interfaces to have it available on a dom0 reboot without having to manually create the bridge over the shell. So it's not a Xen specific problem, but debian-related (I just need to know the right config file syntax).
-
-
maff about 14 yearsSure, that would be possible, but using debian's built in network scripts would be the cleaner way.
-
maff about 14 yearsI don't have any ports to bridge when the bridge is created as the only bridged interfaces belong to the VMs which get created later. However, i re-checked my config and noticed that I had 2 "up route add..." entries standing below the bridge config which belonged to the eth0 interface. I also added "bridge_ports none" to the bridge config and now it works :)