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Subject: Re: RIPE down - DDoS confirmed
From: Ragnar Lonn <[log in to unmask]>
Reply-To:Network management discussion for Nordic region <[log in to unmask]>
Date:Thu, 27 Feb 2003 17:53:22 +0100

TEXT/PLAIN (42 lines)

Has anyone ever considered designing a dynamic traffic shaping filter to
prevent DOS attacks?

The idea is to combine a traffic shaper/rate limiter with a database
of info on what systems a host usually talks to and if a traffic pattern
appears that diverges significantly from the "usual" pattern, then
surplus traffic gets dropped. This software is installed on a physical
machine that acts as gateway for the system(s) that is/are to be

I mentioned this idea to Lars-Johan Liman (who runs the swedish root
server) after the much-publicised attack on the root servers earlier
and he didn't seem to know of anything similar that existed.


On Thu, 27 Feb 2003, Kurt Erik Lindqvist wrote:

> On torsdag, feb 27, 2003, at 16:48 Europe/Stockholm, amar wrote:
> > From NaNog:
> >
> >> RIPE NCC just sent an email to the AMS-IX list stating that
> >> they are currently experiencing an ICMP DDOS attack.
> >
> > -- amar
> >
> This is somewhat interesting in what is going on on the "Domains" list
> (regarding Swedish domain politics) as after math to PTS report on
> vulnerabilities of the Internet in terms of crisis. How many people
> build their incoming filters of the RIPE database and what happens if
> that is down for a longer period of time? Or just when the scripts are
> run?
> Anyone using the Swedish mirror?
> Best regards,
> - kurtis -

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