RE: [LARTC] QoS on bridge device

["S Mohan" <smohan@vsnl.com>]

The packet flow diagrams have been well documented here.
http://users.pandora.be/bart.de.schuymer/ebtables/br_fw_ia/br_fw_ia.html

If you are matching packets for shaping, you must use tc. iptables will not
do any shaping. It will only modify headers and take decision on packet
flow. The only place where this would be amenable to any kind of traffic
management is rate limiting. This is not in any place/ application
constitute/construe bandwidth management or traffic shaping.

Mohan

-----Original Message-----
From: lartc-admin@mailman.ds9a.nl [mailto:lartc-admin@mailman.ds9a.nl]On
Behalf Of Abraham van der Merwe
Sent: 04 March 2003 18:36
To: Bogdan Coman
Cc: Linux Advanced Routing & Traffic Control list
Subject: Re: [LARTC] QoS on bridge device


Hi Bogdan!

Thanks. One more question:

If I match packets for shaping (instead of tc filters), which chain should I
match packets on? Usually I use FORWARD in the mangle table, but if I look
at the following diagram:

http://www.sparkle-cc.co.uk/firewall/firewall.html

it seems that packets won't go through FORWARD anymore (if it goes through
the bridge) so I guess I should match packets on OUTPUT in the mangle table
- is this assumption correct?

> The shaping is done on eth0 and eth1. There is also a patch that allows
> you to match packets that are passing the bridge with iptables. Br0 is
> used only for trafic that is for the bridge. Eg. a machine has a route
> through the ip of br0.
>
> Bogdan Coman
>
> On Tue, 2003-03-04 at 10:58, Abraham van der Merwe wrote:
> > Hi!
> >
> > Usually if you have a machine and traffic passes through it:
> >
> >               +-----+
> >           eth0| QoS |
> >  -------------| box |-------------
> >               |     |eth1
> >               +-----+
> >
> > You can shape outgoing traffic on eth0 and eth1 effectively shaping both
> > incoming/outgoing traffic.
> >
> > With bridging and above setup you only have a single device br0 - my
> > question is whether you can shape both incoming/outgoing traffic on this
> > device (i would presume it is not possible) or do you need to redirect
> > traffic passing through br0 to imq0 and do shaping on outgoing traffic
on
> > both br0 and imq0?

>
>
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--

Regards
 Abraham

I'm not sure whether that's actually useful...
             -- Larry Wall in <199710011704.KAA21395@wall.org>

___________________________________________________
 Abraham vd Merwe [ZR1BBQ] - Frogfoot Networks
 P.O. Box 3472, Matieland, Stellenbosch, 7602
 Cell: +27 82 565 4451 Http: http://www.frogfoot.net/
 Email: abz@frogfoot.net


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