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How did the laptop picked up network connectivity?

I have a basic network with a Win2003 Exchange Serve for domain controller. Well, typically when a visitor shows-up I need to configure the DNS gateway for it to get internet access. I had a visitor come in today, plugged his laptop and before I could sit down and configure the DNS it gain network connectivity and was browsing the internet freely. Normally visitors got XP machines, this is a brand new Vista laptop& ideally we dont what that to happen. Is there something that Vista has that enables the laptop to gain connectivity like that? If Vista has that enhancement, how can I stop it from gaining access so freely?

SOLUTION

mikey1h

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JLMEJIA

ASKER

Ok... I suppose then that my regular PCs that get their IP assigned automatically will loose connectivity unless I assign an IP manually. is this the case? and, is this something that Vista takes advantage of or how is it that the XP machines require me to configure the gateway IP...

mikey1h

you wouldn't have to assign the IP statically, leave that setting obtain automatically, but the second set of boxes allows you to specify a DNS server.... if the DHCP server does not have config information any longer to prevent unauthorized laptops, you will have to put in the DNS server addresses there manually

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samiam41

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SOLUTION

samiam41

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samiam41

Opps.... And now the link -> http://www.windowsecurity.com/articles/DHCP-Security-Part1.html

tankergoblin

are u using DHCP server

JLMEJIA

ASKER

sorry for stalling for a few weeks there...

No I'm no using the DHCP server... well I'm nor sure that (i didn't setup this network) we're not using it. the PCs have no DHCP info but the exchange server has a 30 address pool open. some leases are infinite some have time limit.

mikey1h

Not understanding why I was an assisted solution when the posting that was accepted starts the post with Mikey1h is right

JLMEJIA

ASKER

None of the solutions posted fixed my problem. I guess I couldn't make my self clear enough then it became an irrelevant issue so I gave up. I awarded the points based on the amount of info provided by that answer posted.
I'm not sure how to change the points awarded...