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c.f. bug 424647
List Archive: gentoo-security
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To: gentoo-security@g.o
From: Edward Faulkner <edward@...>
Subject: Re: firewall suggestions?
Date: Thu, 8 Jan 2004 12:00:35 -0500
DROP will add about 3 minutes to the total cost of the scan, because
you need to wait for timeout.  This is the slowdown you're seeing.
However, during those three minutes you can scan 1, 10, or 10000
machines, and it will still take only three minutes.  

To actually do this you'd probably need to increase nmap's
--max-parallelism parameter.


On Thu, Jan 08, 2004 at 10:29:23AM -0600, Thomas T. Veldhouse wrote:
> It slows down NMAP plenty ... are you saying it is not a good scanner?
> 
> Tom Veldhouse
> 
> P.S.  I have to top post the reply because your email is an attachment and I
> have to cut'n'paste the original message ... I refuse to manually quote it
> 
> ----- Original Message -----
> From: "Edward Faulkner" <edward@...>
> To: "Thomas T. Veldhouse" <veldy@...>
> Cc: "Oliver Schad" <o.schad@...>; <gentoo-security@g.o>
> Sent: Thursday, January 08, 2004 10:09 AM
> Subject: Re: [gentoo-security] firewall suggestions?
> 
> As has already been pointed out, using DROP would not slow down a good
> scanner significantly.  You could parallelize so that you can scan as
> many machines as you want, all within one timeout period.
> 
> And it only takes one good coder to arm all the script kiddies with a
> good scanner.
> 
> -Ed Faulkner
> 
Attachment:
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References:
Re: firewall suggestions?
-- Oliver Schad
Re: firewall suggestions?
-- Thomas T. Veldhouse
Re: firewall suggestions?
-- Oliver Schad
Re: firewall suggestions?
-- Thomas T. Veldhouse
Re: firewall suggestions?
-- Edward Faulkner
Re: firewall suggestions?
-- Thomas T. Veldhouse
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Updated Jun 17, 2009

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