How to clear previously leased IP address from network adapter?

[cqb_driver]

Background:
Windows 7 Ultimate x64. My primary network adapter is configured to use a static IP address. I am using OpenVPN to connect to my VPN service. OpenVPN utilizes the virtual Tap32 adapter - Seen as Local Area Connection 2 in my network settings.

Problem:
Every time I connect to the VPN an Error 1002 is logged in Windows event viewer. The error reads as follows:

"The IP address lease x.x.x.x for the Network Card with network address 0x00FF2395D30C has been denied by the DHCP server x.x.x.x (The DHCP Server sent a DHCPNACK message)."

Note that the MAC address in the Error (FF2395D30C) is the MAC address of the Tap32 adapter.

What appears is happening is that after a successful connection to the VPN the IP address leased to the Tap32 adapter for that session is cached somewhere and then upon reconnecting at a later time, the Tap32 adapter requests that same IP address from the VPN providers' DHCP server which is then denied and a new IP address is leased to the adapter.

There doesn't appear to be any internet access or network problems other than perhaps taking a little longer to connect to the VPN but I am looking for a way to keep the error from being logged.

Is there a way to remove a network adapter's cached IP address upon disconnecting from the VPN so that the virtual adapter is not requesting that old IP address when I reconnect? Any other suggestions?

 

[JackMDS]

Use Static IP (Or IP reservation in the Router) for the devices that need continuity in usage.

 

[cqb_driver]

Tried it for the hell of it but it doesn't work. OpenVPN reconfigures the virtual adapter to obtain IP address automatically and it needs to be that way or else I will run into a conflict with the IP addresses available for lease from from the VPN service provider.

Physical adapter and router are already configured for static IP addresses.

 

[azazel1024]

Always on disconnect? I don't know of a way, but you can do ipconfig /release from a command prompt.

You could setup a batch file on your desktop to run to release your IP address whenever you disconnect. You could conceivably setup a batch file to launch OpenVPN and have it trigger the ipconfig /release upon closing OpenVPN, but that is trickier.

 

[cqb_driver]

I thought about that. I didn't think it would work because that command can only be ran while the adapter is still connected. I'll play around with it and see what I get.


ETA: Executing ipconfig /release just before manually disconnecting from the VPN does work and the error is not logged upon reconnecting. Reconnecting is faster as well. I was able to automate the command with a batch file, however, it only works when disconnecting manually. If I am connected to the VPN and restart my computer before manually disconnecting it looks like Windows is closing the connection or maybe signaling OpenVPN to do it internally; either way my batch file is bypassed in this scenario so now I am looking for a solution to that.

 

[digitheads]

delete the lease from the DHCP server