netdev - Re: [RFC PATCH] dont create cached routes from ARP requests

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Date:	Thu, 23 Sep 2010 17:05:02 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Ulrich Weber <uweber@...aro.com>
Cc:	David Miller <davem@...emloft.net>, netdev@...r.kernel.org
Subject: Re: [RFC PATCH] dont create cached routes from ARP requests

Le jeudi 23 septembre 2010 à 16:47 +0200, Ulrich Weber a écrit :
> On Wed, Sep 22, 2010 at 08:34:42PM -0700, David Miller wrote:
> > From: Ulrich Weber <uweber@...aro.com>
> > Date: Wed, 22 Sep 2010 18:22:09 +0200
> > 
> > > Background: At home I have two Internet connections, DSL and Cable.
> > > DSL is the primary uplink while Cable is the secondary.
> > > My Cable ISP is flooding me with ARP request from 10.0.0.0/8,
> > > which creates routes via the primary uplink.
> > > There are thousands of cached routes and after some time
> > > I get "Neighbour table overflow" messages.
> > 
> > If you get neighbour table overflows, something is holding a reference
> > to the routing cache entry and/or the neighbour entries those routing
> > cache entries are attached to.
> > 
> > If these really are transient entries, they should be trivially
> > garbage collected and not cause any problems at all.
> rt_garbage_collect is not called within rt_intern_hash,
> because the call is done within softirq context.
> 
> Forcing the call of rt_garbage_collect didn't help either,
> there are no routes freed afterwards...
> 

Please give us more information.

grep . /proc/sys/net/ipv4/route/*

rtstat -c10 -i1

Thanks


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