A device stole my gateway address

A device on my network stole the ip address used for my pix 515

How do I find it?
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Steve KnightConnect With a Mentor IT ConsultancyCommented:
Turn your gateway off then from a device on the same subnet .... telnet to it, ping it, nbtstat -A, 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!
darovitzAuthor Commented:
It looks as if it is a wireless access point by Linksys.
Steve KnightIT ConsultancyCommented:
Sorry didn't come out so clear, I mean

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

darovitzAuthor Commented:
Someone plugged in a router to share their connection with someone else in their office.  Thanks so much.
Steve KnightIT ConsultancyCommented:
no problem, hope it helped.  Don't suppose they  let you sack the person, oh well :-)
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