Client will not release old ip address

[rrh0561]

Hello,
I am having a problem with my DHCP vlans where if I move a laptop from one vlan to another the old address is not being released. I am using a windows 2003 server using dhcp superscopes 10.10.10.x,10.10.20.x,10.10.30.x etc..
If I manually relase the address and then renew, the client is assigned the old address. The only way I've found to fix the problem is temporarily assign the old address to a bogus MAC which is unacceptable. I've tried setting scope options to clear ARP cache but that didn't work.

Does anyone have any thoughts?
Thanks,
Bob

 

[rrh0561]

Removed superscode to solve problem.

 

[JrNetEng]

What is your ARP refresh rate on your switches? You may want to lower it to about every 3 minutes. Have you tried checking your IP Properties to make sure there is not a static IP entered?
Have you tried releasing before you move ot a different VLAN and then renewing when you plug in again?

 

[martyh]

Since removing the superscope solved your problem this thread is, I guess dead but I have a question for you:

Unless you actually need different VLANs, why not supernet instead of superscoping? This would negate the need for packets to be routed between VLANs and increase your throughput and would also facilitate net messaging to all machines in the event that you needed to take a router down or something.

Just a thought.

Marty
Network Admin
Hilliard Schools