Re: [nsp] Code red and ARPs

From: Gert Doering (gert@greenie.muc.de)
Date: Tue Aug 07 2001 - 06:13:28 EDT


Hi,

On Tue, Aug 07, 2001 at 12:55:26PM +0200, Hank Nussbacher wrote:
> "clear arp-cache" doesn't help and there appears to be no way to set a
> timer to get rid of these entries (arp timers are only on a per interface
> basis and not for incompletes). Anyone else see this and have a solution?

As a very hacky solution you could put a Linux box into your network
that Proxy-ARPs for all those unused IPs (and then tarpits the Code Red
scans).

We're just now building such a box, not for the ARPs (the networks
in question are fairly well populated, so there are not too many
imcompletes) but to slow down scans and thus reduce bandwidth wastage
and possibly infection rates.

gert

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Gert Doering - Munich, Germany                             gert@greenie.muc.de
fax: +49-89-35655025                        gert.doering@physik.tu-muenchen.de



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