Re: Neighbour table overflow.

[David S. Miller]

On Wed, 27 Oct 2004 00:11:26 +0200
Dominik Karall <dominik.karall@xxxxxxx> 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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