netdev - Re: linux bridge problem

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Message-ID: <20100124092333.230aa8eb@opy.nosense.org>
Date:	Sun, 24 Jan 2010 09:23:33 +1030
From:	Mark Smith <lk-netdev@...netdev.nosense.org>
To:	Metuki Sabhe <sabhe.metuki@...il.com>
Cc:	bridge@...ts.linux-foundation.org, netdev@...r.kernel.org
Subject: Re: linux bridge problem

On Sat, 23 Jan 2010 16:41:40 +0200
Metuki Sabhe <sabhe.metuki@...il.com> wrote:

> CC'ing netdev too:
> 
> 
>  Hello,
> 
>  When I add interfaces to the bridge *after* I have "tcpdump -n -i br0"
>  running on the bridge,
>  my tcpdump don't see any communication. If I kill tcpdump and
>  re-execute it *after* I added
>  the interface to the bridge, it works just fine.
> 

How long are you waiting? Make sure you're not encountering the default
forwarding delay of 20 seconds You can change that value to zero using

brctl setfd br0 0

which brings new interfaces into forwarding state immediately, rather
than going through the listening and/or learning states.

>  The same behavior happens with my DHCP server (which listens only on
>  my bridge interface);
>  I need to re-execute (reset) it after I add the interface to the bridge.
> 
>  Is that normal ?
> 
>  Why does it happen ?
> 
>  What should I do ?
> 
>  It's a little awkward to reset my DHCP server every time I add a new
>  interface to the bridge..
> 
>  Thanks,
>  Sabhe
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