Re: Neighbour table overflow.

[Dominik Karall]

On Wednesday 27 October 2004 01:06, David S. Miller wrote:
> 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.

the subnet mask is set to 255.255.0.0, and there are machines from 172.16.0.1 
to 172.16.1.254. but not all ips are reserved. there are "only" about 100 
machines in the network.
i will try to change the values of gc_thresh*, maybe it helps. thx!

dominik

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