netdev - Re: Multiple GRE tunnels on the same host, only one routes incoming packets

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Date:	Sat, 11 Feb 2012 13:55:18 +0100
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Rick Koshi <netdev@...e-right-rudder.com>
Cc:	netdev@...r.kernel.org
Subject: Re: Multiple GRE tunnels on the same host, only one routes incoming
 packets

Le samedi 11 février 2012 à 07:10 -0500, Rick Koshi a écrit :
> Eric Dumazet writes:
> > 
> > check :
> > 
> > grep . `find /proc/sys -name rp_filter`
> 
> Thank you, thank you, thank you!  This is exactly right.
> CentOS by default sets reverse-path filtering (which I'd
> never even heard of before your message) partially on
> (value 1 in /proc/sys/net/ipv4/conf/default/rp_filter).
> 
> In my case, I need it completely off for my 2 tunnel
> interfaces.  A quick change to my setup script, and
> everything works now.
> 
> Thank you so very much.  You have saved me hours
> of frustration and given me a good night's sleep.  :-)
> 

You're very welcome :)


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