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RE: rogue IP address
From: "Fields, James" <James.Fields () bcbsfl com>
Date: Thu, 1 May 2003 14:20:43 -0400

Sorry if this seems like a dumb question, but you mentioned a "port to IP"
table in your switch.  Does your switch have a "port to MAC address table"?
Or is that what you actually were referring to?

If it has that, you can look at the ARP cache in the router for that segment
and find the MAC associated with the IP address.  Then you can compare the
MAC to the table in the switch to find the port.

-----Original Message-----
From: dondon () pacbell net [mailto:dondon () pacbell net] 
Sent: Wednesday, April 30, 2003 6:40 PM
To: security-basics () securityfocus com
Subject: rogue IP address



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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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 
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