Re: rogue IP address

["Duston Sickler" <dustons () abswebb net>]

Did LANguard give you a MAC address of the offending NIC?  If so you can
look for the station that way if you have documented them.  You could also
send an Administrative email out to all users specifying how to locate the
MAC address on  the OS they run and have them email you back.  When you find
the MAC you have your user.

Good luck,

Duston Sickler
"There are 10 types of people in the world, those who understand binary and
those who don't".
----- Original Message -----
From: "Dave" <david.morris () curvalue nl>
To: <security-basics () securityfocus com>
Sent: Friday, May 02, 2003 2:48 AM
Subject: Re: rogue IP address


Hi,
    I do not know your switch, or your network layout, but generic method
which works in most cases is to set up a fast/"large data size" ping to said
IP address.

Look for the fastest blinking light.

I know it is not scientific, and probably offends some people but it does
work. (For up to a few hundred ports).

- Assumes flat network.
- Better to do it at a 'quiet' time, the effect is more noticeable
- Assumes that you are aware of your important ports (servers/routers etc.)
which normally have high load anyway.
- Do NOT do it if network performance is critical, you can overload the best
of switches with ICMP.
- Maybe there are a few ports which look like possibilities, but at least
you
have narrowed them down.

/Dave

On Thursday 01 May 2003 00:40, dondon () pacbell net wrote:
> Someone on our network assigned an IP address to their own system without
> my knowledge.  Using LANguard network scanner, the best I can tell is that
> it's a Linux box.  The port-to-IP mapping table on our Asante switch
> doesn't see to work correctly.
>
> Any suggestions on tracing down that system that is associated with the IP
> is appreciated!
>
> Andy
>
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---------------------------------------------------------------------------
FastTrain has your solution for a great CISSP Boot Camp. The industry's most
recognized corporate security certification track, provides a comprehensive
prospectus based upon the core principle concepts of security. This ALL
INCLUSIVE curriculum utilizes lectures, case studies and true hands-on
utilization
of pertinent security tools. For a limited time you can enter for a chance
to win one of the latest technological innovations, the SEGWAY HT.
Log onto http://www.securityfocus.com/FastTrain-security-basics
----------------------------------------------------------------------------


---------------------------------------------------------------------------
FastTrain has your solution for a great CISSP Boot Camp. The industry's most 
recognized corporate security certification track, provides a comprehensive 
prospectus based upon the core principle concepts of security. This ALL INCLUSIVE curriculum utilizes lectures, case 
studies and true hands-on utilization 
of pertinent security tools. For a limited time you can enter for a chance 
to win one of the latest technological innovations, the SEGWAY HT. 
Log onto http://www.securityfocus.com/FastTrain-security-basics 
----------------------------------------------------------------------------