Re: [Xen-users] Problems with bridged networking

[Thomas Robers <robers@xxxxxxxxx>]

Hi Steffen,

thanks for the answer

Steffen Heil schrieb:
> > I'm using Xen 3.0.3 on two servers with Debian Etch (amd64). These
> > servers have 10 nics (2 onboard and 8 in two 4-port cards) so that
> > every vm can have its own interface.
> Just for interest... why?
> Aren't they all connected to the very same switch?
Yes, that's right, the vm are partially on different
networks.

> > So there's no xenbr0 up and brctl shows this:
> > > server:~# brctl show
> > bridge name     bridge id               STP enabled     interfaces
> > eth0            8000.000e0c43ab3d       no              peth0
> So there IS a bridge, but it's name is eth0, which is default for xen
> 3.2.1...
Is this normal to version 3.2.0 too? Because I only found version 3.2.0
for Debian.

> Earlier versions created xenbr0 and added a virtual interface eth0, newer
> versions just name the bridge eth0. Basically the same, with one indirection
> less.
Ok, but is there a chance to get the other bridges up too? I tried:

        server:/etc/xen/scripts# ./network-bridge bridge=eth1 netdev=eth1 start
        ifdown: interface eth1 not configured
        Nothing to flush.
        Waiting for peth1 to negotiate link......
        Ignoring unknown interface eth1=eth1.

So that doesn't work, and I used this command for version 3.0.3 to set up all
the bridges and the message I get is the same when I use 'bridge=xenbr1'.
I also tried this:

        server:/etc/xen/scripts# ./network-bridge start netdev=eth3 
bridge=xenbr3
        ifdown: interface eth3 not configured
        Nothing to flush.
        Waiting for peth3 to negotiate link.
        Ignoring unknown interface xenbr3=xenbr3.

and brctl shows the bridge named 'xenbr3':

        server:/etc/xen/scripts# brctl show
        bridge name     bridge id               STP enabled     interfaces
        eth0            8000.000e0c43ab3d       no              peth0
        eth1            8000.000e0c43ab3e       no              peth1
        xenbr3          8000.000e0cc51af5       no              peth3


I don't understand whats happening there. Why is there a bridge interface
like it should but I can't use it. I booted the domU (thats possible now)
which uses xenbr3 but I don't get a connection the network. In the domU the eth0
interface is up and running when I try to do a ping to the gateway ip address
I get no answer. So I don't really understand why the 'network-bridge' script
doesn't work. Do you have any other advice where I can search?

Thanks
Thomas

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