netdev - Re: Routing over multiple interfaces

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Date:	Thu, 04 Nov 2010 15:01:27 +0100
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Patrick Schaaf <netdev@....de>
Cc:	netdev@...r.kernel.org
Subject: Re: Routing over multiple interfaces

Le jeudi 04 novembre 2010 à 13:51 +0100, Patrick Schaaf a écrit :
> > iptables -t mangle -A PREROUTING -d $EXTERNAL -m statistic --mode nth --every 2 -j MARK --set-mark 6
> 
> If statistics match is missing, a pretty good alternative I recently
> "found" is using u32 to match for a bit from the IP ID. That is a
> stateless decision, and here it probably has the theoretical advantage
> of putting all fragments of a given packet onto the same link.
> 
> iptables -t mangle -A PREROUTING ... -m u32 --u32 0x2&0x1=0x0 -j MARK
> --set-mark 6

Sure, thats a good tip/idea, but note many UDP frames have IP.id = 0



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