netdev - Re: Linux vs FreeBSD Which is correct.

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Date:	Wed, 17 Aug 2011 20:17:48 +0300
From:	"Rémi Denis-Courmont" <remi@...lab.net>
To:	sclark46@...thlink.net
Cc:	Linux Kernel Network Developers <netdev@...r.kernel.org>
Subject: Re: Linux vs FreeBSD Which is correct.

Le mercredi 17 août 2011 20:03:18 Stephen Clark, vous avez écrit :
> I have run into a situation where if I ping our HQ the response comes
> back on a different
> interface than what the request went out on. FreeBSD is happy and says
> it got the response,
> Linux is not and gives no indication it got a response.
> 
> So is FreeBSD wrong or is Linux wrong?

Most distributions enable reverse path filtering by default.
It can be disabled:
# echo -n 0 > /proc/sys/net/ipv4/conf/all/rp_filter

But you should probably fix the configuration instead (e.g. /etc/sysctl.conf).

-- 
Rémi Denis-Courmont
http://www.remlab.net/
http://fi.linkedin.com/in/remidenis
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