We have a number of laptops in our workplace, all Latitudes (D600,D610,D620,D800,D810,D820) and we are having this problem occasionally. What is happening is when users take their laptops home at the end of the day and plug into their network the laptop gets a new IP assigned and works fine. The user then shuts down the laptop (not hibernate) and brings it to work the next morning and the laptop when connect to our network causing a IP conflict.

 

If the user unplugs from their home network, then shuts it down the IP is released. When they shut it down then unplug the laptop thinks its still in the same network when it is turned back on at the office.

 

We have it set on our DHCP server to release IP on shutdown which is working fine but we can't find how to set the laptop to release the IP when shutdown.

 

I have been doing lots of research and there is a good change it's caused by Windows XP Pro SP2 that is installed on all the laptops but I having lots of problems finding a solution so hopefully someone here can help.