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List Archive: gentoo-security
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To: Scott Taylor <scott@...>
From: Stewart Honsberger <blkdeath@g.o>
Subject: Re: firewall suggestions?
Date: Sat, 31 Jan 2004 04:08:34 -0500
Scott Taylor wrote:
> Replying in a specific manner which may have been at one point the
> proper and polite way for an IP stack to behave, often turns into a
> method for abuse. Spoof a bunch of syn packets to a host you know
> replies with a rst, and it sends all those extra packets to a victim
> machine who never sent the syn packet in the first place. So that
> machine sends back "port unreachables" and further clogs up their
> network. 

This is a variation of an attack known as "Distributed Reflective Denial 
of Service"; most often associated with ICMP and "Destination Host 
Unreachable" or even ICMP echo response packets.

VERY powerful attack; I've seen OC-3s brought to their knees by a kiddie 
on a cable modem.

(Analogy points to the military technique known as "carpet-bombing". 
Wanna take out a host? Why not just remove his ISP from the Internet?)

-- 
Stewart Honsberger - http://blackdeath.snerk.org/
To teach is to learn twice.
                 -- Joseph Joubert

--
gentoo-security@g.o mailing list

References:
Re: firewall suggestions?
-- Ben Cressey
Re: firewall suggestions?
-- Oliver Schad
Re: firewall suggestions?
-- Paul de Vrieze
Re: firewall suggestions?
-- Scott Taylor
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Updated Jun 17, 2009

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