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A device stole my gateway address

Posted on 2006-11-29
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Last Modified: 2010-08-05
A device on my network stole the ip address used for my pix 515 192.168.1.1

How do I find it?
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Question by:darovitz
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5 Comments
 

Author Comment

by:darovitz
ID: 18041251
It looks as if it is a wireless access point by Linksys.
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Accepted Solution

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Steve Knight earned 500 total points
ID: 18041389
Turn your gateway off then from a device on the same subnet .... telnet to it, ping it, nbtstat -A 192.168.1.1, http://192.168.1.1 it... to see what it is then look in your switch tables for the mac address reported in your arp tables (ARP -A) and nuke it!

Altenative of course if send an email around "The person who has just plugged unauthorised equipment into the LAN has 5 minutes to remove it or be fired!"... if only!
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Expert Comment

by:Steve Knight
ID: 18041395
Sorry didn't come out so clear, I mean

PING 192.168.1.1
arp -a
Get the mac address, look in your switch tables for that mac.

Steve
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Author Comment

by:darovitz
ID: 18042321
Someone plugged in a router to share their connection with someone else in their office.  Thanks so much.
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LVL 43

Expert Comment

by:Steve Knight
ID: 18042382
no problem, hope it helped.  Don't suppose they  let you sack the person, oh well :-)
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