[Bridge] Preventing packet reassembly

[Leigh Sharpe]

> Are you using hardware that does Large Receive Offload (LRO)? Most

As far as I can tell, no. I'm using standard e1000 cards, which I
believe don't do LRO. Ethtool -S eth1 doesn't show any counters related
to LRO.

> hardware doesn't. The other possible problem would be
ebtables/iptables
> rules.  

Hmm. This may be the problem.

I have iptables rules on the management interface of the box, but not on
any of the ports which participate in bridging.
By removing iptables from my bootup, I get a properly functioning
bridge.

Why would iptables rules on one interface affect traffic bridged on
other interfaces? I'm presuming it's some kind of interaction with the
ip_conntrack module? Any way to stop it from loading?


Cheers,
Leigh.



-----Original Message-----
From: Stephen Hemminger [mailto:shemminger at vyatta.com] 
Sent: Monday, 28 April 2008 3:36 PM
To: Leigh Sharpe
Cc: bridge at lists.linux-foundation.org
Subject: Re: [Bridge] Preventing packet reassembly
>  
>  
> Are you using hardware that does Large Receive Offload (LRO)? Most
> hardware doesn't. The other possible problem would be
ebtables/iptables
> rules.  The bridge itself doesn't reassemble packets, but firewall
> rules might.