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

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Message-Id: <201202111210.q1BCADqU026660@hope.more-right-rudder.com>
Date:	Sat, 11 Feb 2012 07:10:13 -0500
From:	"Rick Koshi" <netdev@...e-right-rudder.com>
To:	Eric Dumazet <eric.dumazet@...il.com>
cc:	netdev@...r.kernel.org
Subject: Re: Multiple GRE tunnels on the same host, only one routes incoming packets

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.  :-)

    -- Rick
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