Re: ALTQ + vlan

[Manuel Bouyer <bouyer%antioche.eu.org@localhost>]

On Tue, Apr 15, 2008 at 12:32:28PM +0200, Rados?aw Kujawa wrote:
> Hello list,
>   I am trying to configure ALTQ on a server, where multipie vlan(4)'s are
> used. However, it looks like ALTQ and vlan are incompatible.
> 
>   For example, let's assume that bge1 is the interface, where vlans are
> configured:
> 
> # ifconfig bge1
> bge1: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> mtu 1500
>         capabilities=7<IP4CSUM,TCP4CSUM,UDP4CSUM>
>         enabled=0
>         address: 00:11:85:c5:cb:41
>         media: Ethernet autoselect (1000baseT full-duplex)
>         status: active
> # ifconfig vlan0
> vlan0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> mtu 1500
>         capabilities=7<IP4CSUM,TCP4CSUM,UDP4CSUM>
>         enabled=0
>         vlan: 1 parent: bge1
>         address: 00:11:85:c5:cb:41
>         inet 10.4.0.1 netmask 0xffffff00 broadcast 10.4.0.255
>         inet alias 10.10.10.3 netmask 0xffffff00 broadcast 10.10.10.255
> 
>   Unfortunately, it does not matter what kind of ATLQ classes and filters
> are set up, every packet will always go to the default class. I have
> following rules for bge1:
> 
> interface bge1 bandwidth 100M cbq
> class cbq bge1 root_class NULL priority 0 pbandwidth 100
> class cbq bge1 net_class root_class exactbandwidth 756000
>         filter bge1 net_class 0 0 0 0 0
> class cbq bge1 lan_class root_class pbandwidth 95 default
>         filter bge1 lan_class 10.4.0.0 netmask 16 0 192.168.0.0 netmask 16
> 0 0
> 
>   altqstat clearly shows that even packets for 192.168.0.0 network are
> going into net_class.
>   Of course, at first I tried using vlan0 instead of bge1 - it does not
> make any difference.
> 
>   I did some experiments - after disabling vlans everything worked as
> expected. I suspect that ATLQ'ing traffic takes place before
> deencapsulation of 802.1q... Is this a known problem? Should I gather
> more data and fill PR?

No, I think it's the expected behavior. The classifier will operate when
packets go out of the IP stack, so you have to use the vlan interfaces and
not bge1 in the config file.

-- 
Manuel Bouyer <bouyer%antioche.eu.org@localhost>
     NetBSD: 26 ans d'experience feront toujours la difference
--