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Re: [Xen-users] Bridging and VLANs 802.1Q trunk

On Wednesday 08 March 2006 5:06 pm, Brian Wong wrote:
> List,
> I am having trouble setting up Xen with VLANs. I am only using one
> network interface, and I plan to use this interface for all of the
> guest instances as well. I have the switch port configured as a trunk
> where it will receive the traffic for multiple VLANs. That said, the
> host that I am configuring Xen on has network connectivity when I run
> 'vconfig add eth0 8' and I use the interface eth0.8.

have you used 802.1Q before? there are some quirks with the MTU.  in my case, 
i had to put eth0 to 1504, and since unpatched 100baseT drivers didn't allow 
more than 1500, i had to use 1000baseT, even if i didn't need the speed.

but i think you want the software bridge to move 'tagged' packets, so it had 
to support MTU 1504 too.  i'm not sure it works.

also, the vif drivers would have to support MTU 1504.... there i think are 
some bad things...

i think it's easier to 'untag' the VLANs in dom0, so you would have several 
eth0.x, and then put those in several bridges, connecting to the appropriate 
vif's; just like having several physical eth cards.

for that to work, you'd have to use the physical eth0, not the 'virtualized' 
eth0 you have after the Xen scripts do their magic.


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