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Re: Nmap issues...? or router?
From: Alex Butcher <alex () s3 integralis co uk>
Date: Mon, 08 Oct 2001 13:39:49 +0100

bluefur0r bluefur0r wrote:
After just completeing an audit for a company that has a DS-3 connection (shared) and a cisco router (2015), One of the 
first issues that was found was this: When nmaping using -sS and all ports, 1 nmap scan nmaping 1 host at a time appeared to 
completely destroy their bandwidth... Has anyone heard of this? Could this be a Router or ISP problem??? It took very long 
to complete because i needed to use the -T Polite option. I'm just curious if anyone else has ever encountered nmap 
using up all network resources for such a high volume connection. Any help would be appreciated so this never happens again. 
*Luckily I started after hours*

I've seen similar; some firewalls (e.g. WatchGuard) start blocking
connections from hosts that generate 'x' policy violations in a
given time.


Best Regards,
Alex Butcher                                      PGP/GnuPG Key IDs:
Consultant, S3 Systems Security Services          alex () s3       B7709088
PGP: http://www.s3.integralis.co.uk/pgp/alex.pgp  alex.butcher@ 885BA6CE

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