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DHCP not giving new ip address for subnet

jjunkins
jjunkins asked
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Last Modified: 2010-04-18
I have one DHCP server with a superscope that holds 3 different subnets. I have a layer 3 switch that forwards dhcp requests to my DHCP server.  When I take a particular laptop from one (192.168.11.x) subnet to another (192.168.12.x) subnet it will not release the 192.168.11.x address.  I can do a ipconfig /release and it will drop the address. (It will also be gone from the server) When I do a Ipconfig /renew it picks up the 192.168.11.x address again. I have only noticed it on one computer on the network. The only work around I have found is to give it a static IP on the correct subnet reboot the computer and make sure there are not entries for that laptop in DHCP.
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Top Expert 2005

Commented:
Have you tried setting the option on the DHCP server properties (DNS tab) to discard A and PTR records on deletion of lease - then set the lease to something reasonable to expect (like 3 or four hours).

You need to balance excessive renewals with the risk of a user moving subnets.  If they do (within the lease period) then you need to delete the lease manually or create a script that can be run to delete the lease.

I don't think you need to be using a superscope for this.

Simply set up each with their own scope and it should work correctly.

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heh...found this but their site is down right now so here's the google cache:

http://72.14.203.104/search?q=cache:-IKYZ9v19t4J:www.mcse.ms/archive43-2003-12-228134.html+superscope+subnet&hl=en&gl=us&ct=clnk&cd=3

basically the guy from MSFT is saying the same thing I just said...and it looks like it's the exact same issue you are having.
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