Re: [Xen-users] VLANs and bridging

["Abel Martín" <abel.martin.ruiz@xxxxxxxxx>]

On 9/6/06, Axxxxx Mcxxxxxx  wrote:
> Hello,
>
> I'm having some trouble getting VLAN bridging to work on my Xen
> installation.  Here's what I've done:
>
> On Dom0, I set up a new bridge and add eth1 to it.  I suppose I'll
> eventually use /etc/xen/scripts/network-bridge to do this for me, but
> I see no reason why this shouldn't work.
>
> dom0# brctl addbr vlans
> dom0# brctl stp vlans off
> dom0# brctl setfd vlans 0
> dom0# brctl addif vlans eth1
> dom0# brctl show
> bridge name     bridge id               STP enabled     interfaces
> vlans           8000.00a0d1e10f67       no              eth1
> xenbr0          8000.feffffffffff       no              peth0
>                                                         vif0.0
>
> eth1 is connected to a switch running 802.1q.  I know my VLANs work
> normally in Dom0 based on the following output where I configure a new
> VLAN on eth1, add an IP and ping something on the VLAN.
>
> dom0# ifconfig eth1.48
> eth1.48: error fetching interface information: Device not found
> dom0# vconfig add eth1 48
> Added VLAN with VID == 48 to IF -:eth1:-
> dom0# ifconfig eth1.48 up 198.18.0.53/24
> dom0# ping 198.18.0.2
> PING 198.18.0.2 (198.18.0.2) 56(84) bytes of data.
> 64 bytes from 198.18.0.2: icmp_seq=0 ttl=255 time=10.3 ms
>
> --- 198.18.0.2 ping statistics ---
> 1 packets transmitted, 1 received, 0% packet loss, time 0ms
> rtt min/avg/max/mdev = 10.332/10.332/10.332/0.000 ms, pipe 2
>
>
> Now I want to have a similar config on my DomU's, so I start one up
> with the following vif configuration:
>
> vif = [ 'bridge=vlans' ]
>
> After it boots, I insert the 8021q module and create a VLAN interface.
>
> domU# insmod 8021q.ko
> 8021q: no version for "struct_module" found: kernel tainted.
> domU# vconfig add eth0 48
> Added VLAN with VID == 48 to IF -:eth0:-
> domU# ifconfig eth0.48 up 198.18.0.53/24
> domU# ping 198.18.0.2
> PING 198.18.0.2 (198.18.0.2) 56(84) bytes of data.
>
> --- 198.18.0.2 ping statistics ---
> 2 packets transmitted, 0 received, 100% packet loss, time 999ms
>
> As you can see, it didn't work.  Back on Dom0, I see the vif for my
> DomU has been added to my bridge as I would expect.  What am I
> missing?  Why aren't tagged frames from my DomU being bridged to eth1
> on Dom0?
>
> dom0# brctl show
> bridge name     bridge id               STP enabled     interfaces
> vlans           8000.00a0d1e10f67       no              eth1
>                                                         vif7.0
> xenbr0          8000.feffffffffff       no              peth0
>                                                         vif0.0
>
>
> Help appreciated.
>
> -Andrew
Hi,

This article might help you.
http://felipe-alfaro.org/blog/category/xen/

Regards.

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