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Re: [Xen-users] xen vlans in domU

To: James Harper <james.harper@xxxxxxxxxxxxxxxx>
Subject: Re: [Xen-users] xen vlans in domU
From: Mark Adams <mark@xxxxxxxxxxxxxxxxxx>
Date: Tue, 3 Aug 2010 11:18:07 +0100
Cc: Alexander Kriventsov <avk@xxxxx>, xen-users@xxxxxxxxxxxxxxxxxxx
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I used the instructions/scripts at the following link to do my VLAN's.
Works pretty well!


On Tue, Aug 03, 2010 at 07:49:03PM +1000, James Harper wrote:
> > 
> > Hello.
> > I'm trying to use vlan in domU, but have something strange:
> > I created bridge on eth0. This interface was configured as trunk with
> > vlan 300, 301. I use this bridge in my domU, and I can see tagged
> > packets when run tcpdump in domU. Also I created interface on domU to
> > work with vlan 300. On this interface I see untagged packets in vlan300.
> > And everything looks fine.
> > But when I'm trying to send out packets through interface with vlan300
> > something happen. On domU in eth0 interface i see that packet was tagged
> > as vlan 300, but on dom0 I see that package doesn't have tag and sending
> > to switch as untagged which is incorrect.
> > 
> > Why does kernel remove tag from outgoing packets?
> > Is anyone using trunk inside of domU?
> > 
> > I'm using xen 3.4.3 on Centos 5.5 with kernel 2.6.18.
> > 
> I'm not sure I quite understand what you want to do, but I think you need to 
> use ebtables, in particular the 'broute' table, to tell Linux how you want 
> tagged packets to behave. One thing I was never able to do was to tell Linux 
> to place a copy of the tagged packet on one bridge so that I could have a 
> trunk to a DomU whilst simultaneously l2 routing packets to their correct 
> interfaces.
> James

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