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To: Daniel Privratsky <dsokrates@...>
From: Alexander Schreiber <als@...>
Subject: Re: firewall suggestions?
Date: Thu, 8 Jan 2004 19:22:37 +0100
On Thu, Jan 08, 2004 at 06:57:28PM +0100, Daniel Privratsky wrote:
> Wrong.
> 
> 1) If you don't receive "destination unreachable" packet, you know
> nothing about the target host yet. This is not perfect-network world.
> There can be other fw/router anywhere in the way, killing this type of
> icmp traffic.
> 
> 2) It slows scans a lot.

Only for people too stupid for doing port scans (a rare defect even
among script kiddies).

> You can of course do scannig in parallel, but
> don't be surprised, when you find yourself killed with no mercy by IDS,
> after matching SYN threshold. 1000+ syns/sec form IP adress to monitored
> system is sure ban.

Cool. Your IDS just banned the IPs of your customers mail-, web- and
proxy-servers. Spoofing IP adresses just to mess with such automatic
systems is easy.

Regards,
       Alex.
-- 
"Opportunity is missed by most people because it is dressed in overalls and
 looks like work."                                      -- Thomas A. Edison

--
gentoo-security@g.o mailing list

Replies:
Re: firewall suggestions?
-- Daniel Privratsky
Re: firewall suggestions?
-- Mans Matulewicz
References:
firewall suggestions?
-- Pooh Sun Tzu
Re: firewall suggestions?
-- Mark Hurst
Re: firewall suggestions?
-- Oliver Schad
Re: firewall suggestions?
-- Daniel Privratsky
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Updated Jun 17, 2009

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