What would be easier is a mechanism to let you know "Hey, new MAC address on 
the network" for which there are numerous tools for that.
David Lum // SYSTEMS ENGINEER
NORTHWEST EVALUATION ASSOCIATION
(Desk) 971.222.1025 // (Cell) 503.267.9764
From: Joe Heaton [mailto:[email protected]]
Sent: Tuesday, January 27, 2009 10:30 AM
To: NT System Admin Issues
Subject: RE: Managing DHCP

That's what I thought...more work than is justifiable, and it pretty much 
negates the purpose of DHCP...  Thanks Matt.

Joe Heaton
Employment Training Panel

From: Matthew Bullock [mailto:[email protected]]
Sent: Tuesday, January 27, 2009 9:53 AM
To: NT System Admin Issues
Subject: RE: Managing DHCP

A lot of managed switches allow you to limit which MAC addresses are allowed on 
the network.  That would be the most secure way.  For DHCP, you could create 
reservations for all the devices on your network, and for IP's not used, enter 
a dummy MAC as a placeholder.  Someone would  be able to get around this by 
manually entering an IP address though.

mb

From: Joe Heaton [mailto:[email protected]]
Sent: Tuesday, January 27, 2009 9:44 AM
To: NT System Admin Issues
Subject: Managing DHCP

Is there any way to have DHCP only give out addresses to known devices?  Last 
week we had a mysterious network/workgroup appear in Network Places.  My 
thought is that someone brought in a personal laptop and connected it to the 
network in order to get internet access.  Is there anyway to not allow this?

Joe Heaton
AISA
Employment Training Panel
1100 J Street, 4th Floor
Sacramento, CA  95814
(916) 327-5276
[email protected]

















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