Re: bridge vlan_filtering don't work with tap devices (qemu guests)

Alexandre DERUMIER
2013-12-26T13:57:29Z

Hello Again,

One more question :

If I use tcpdump on br0, I don't see any tagged vlan10 packets on the bridge.
with
# bridge vlan add dev tap0 vid 10 pvid untagged
# bridge vlan add dev tap1 vid 10 pvid untagged

What I would like to do, is tagging vlan10, incoming (untagged) packets from tap0 and tap1.

Is it possible ?

With openvswitch, I can do it simply with "ovs-vsctl set port tap0 tag=10"

----- Mail original -----

De: "Alexandre DERUMIER" <aderumier@odiso.com>
À: "Toshiaki Makita" <makita.toshiaki@lab.ntt.co.jp>
Cc: netdev@vger.kernel.org
Envoyé: Mardi 24 Décembre 2013 20:28:55
Objet: Re: bridge vlan_filtering don't work with tap devices (qemu guests)

>>If you want to send untagged frames, please try to make configuration
>>like this:
>># bridge vlan add dev tap0 vid 10 pvid untagged
>># bridge vlan add dev tap1 vid 10 pvid untagged
>>
>>Thanks,
>>Toshiaki Makita

Thank you ! It's working now.
I thinked that "untagged" was for not tagging from the bridge, I understand now.

Thanks again and merry Xmas !

----- Mail original -----

De: "Toshiaki Makita" <makita.toshiaki@lab.ntt.co.jp>
À: "Alexandre DERUMIER" <aderumier@odiso.com>
Cc: netdev@vger.kernel.org
Envoyé: Mardi 24 Décembre 2013 13:45:05
Objet: Re: bridge vlan_filtering don't work with tap devices (qemu guests)

On Mon, 2013-12-23 at 17:02 +0100, Alexandre DERUMIER wrote:
> Hello,
>
> I'm trying to use vlan_filtering on bridge.
>
> setup is : 2 qemu virtual machines (tap0 and tap1), plugged in a bridge br0.
> virtual machines don't tag packets.
>
>
> qemuvm1 eth0 --tap0----->br0<-------tap1---qemuvm2 eth0.
>
>
> with vlan_filtering disable, both vms can ping together.
>
>
> If I enabled filtering
>
> #echo 1 > /sys/class/net/br0/bridge/vlan_filtering
>
> Both vms cannot ping together anymore.
>
> So, I have tried to put vlan on tap interfaces with
>
> #bridge vlan add dev tap0 vid 10
> #bridge vlan add dev tap1 vid 10

If you want to send untagged frames, please try to make configuration
like this:
# bridge vlan add dev tap0 vid 10 pvid untagged
# bridge vlan add dev tap1 vid 10 pvid untagged

Thanks,
Toshiaki Makita

> #bridge vlan show
> port vlan ids
> br0 None
> tap0 10
> tap1 10
>
>
>
> But, it doesn't work.
>
> tcpdump on bridge (tcpdump -i br0 -e -n) or in destination qemu (tcpdump -i eth0 -e -n) , don't see any packet
>
> any idea ?
>
> Regards,
>
> Alexandre Derumier
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