Date: Tue, 26 Oct 2004 16:06:42 -0700
From: "David S. Miller" <davem@davemloft.net>
To: Dominik Karall <dominik.karall@gmx.net>
Cc: earny@net4u.de, linux-kernel@vger.kernel.org
Subject: Re: Neighbour table overflow.
Message-Id: <20041026160642.605f7fd7.davem@davemloft.net>
In-Reply-To: <200410270011.28818.dominik.karall@gmx.net>
References: <200410261939.33541.dominik.karall@gmx.net>
	<200410262352.20806.earny@net4u.de>
	<200410270011.28818.dominik.karall@gmx.net>
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On Wed, 27 Oct 2004 00:11:26 +0200
Dominik Karall <dominik.karall@gmx.net> wrote:

> On Tuesday 26 October 2004 23:52, Ernst Herzberg wrote:
> > On Tuesday 26 October 2004 19:39, Dominik Karall wrote:
> > > can anybody explain why i get thousands of "Neighbour table overflow."
> > > messages? i didn't get such ones with older kernels (~2.6.6).
> >
> > Do you set a default gateway?
> 
> yes, default gateway is set to our server.

Do you use a large subnet mask?  For example /16 or /8 or
something like that?

If so, you will need to bump up the neighbour table garbage
collection thresholds under /proc/sys/net/ipv4/neight/default/
Specifically gc_thresh1, gc_thresh2, and gc_thresh3

You probably have a huge number of machines on your subnet.
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