Re: How NAT reacts on table flood ?

[bob.middaugh () comcast net (Bob Middaugh)]

Use FreeBSD.  I've scanned aggressively with several nmap processes running, with no problem at all....and that box 
also does stateful packet inspection.

 -------------- Original message ----------------------
From: "Robert E. Lee" <robert () dyadsecurity com>
> On Tue, 11 Jul 2006 15:15:12 +0200
> "Norbert François" <norbertlike () gmail com> wrote:
> > I was wondering how the NAT reacts when its translation table is
> > full... For example, suppose that you've 100 computers behind a NAT
> > (University) and one (or more) of them engages purposely  a lot of
> > connexion, in order to fill the NAT table, what will occur ?
>
> It will no longer complete new connections.  In most cases the already 
> established connections will continue to function, but in some cases the device 
> will stop passing traffic altogether.
>
> Pretty easy to replicate this one from home if you have a linksys/smc/whatever 
> nat box at your house, grab your favorite port scanner and scan the internet at 
> a high speed.  It should kill your NAT box rather quickly as it has to account 
> for connection status for every attempted connection.
>
> Robert
>
> -- 
> Robert E. Lee
> Chief Information Officer
> http://www.dyadsecurity.com
>  
> phone: (949) 394-2033
> fax  : (949) 486-6601
> email: robert () dyadsecurity com
>
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you need to proactively protect your applications from hackers. Cenzic has the 
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managed service (Cenzic ClickToSecure) or an enterprise software 
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