I am running DHCP from a W2K server (AD, DNS on)to W2KPro and 98SE clients across 6 different gateways. Once a client has been assigned an IP address it will not change, even if the old one is inappropriate, ie. the computer has been moved to a different v-lan. ipconfig/release, renew picks up the same address as previously assigned. I have at times been able to work around this problem by uninstalling the TCP/IP protocol, deleting the lease from the server, reinstalling the protocol, new, correct address is picked up. Now I have changed a machine from NTFS W2K to FAT32 98SE and it still insists on picking up the old (wrong v-lan) address. Uninstalling and re-installing the card (through device manager), deleting and adding the protocol, with the appropriate restarts, all made no difference. I found one article in the Microsoft KB indicating that the IP address is cached in the registry for speed of re-assignment, which is what lead me to the IP protocol removal/ readddition. I have over 200 laptops that need to be more mobile in my building and this is the biggest stumbling block. Make no assuptions that I have the DHCP server set up correctly as I am quite the newbie on both the NT platform as well as using DHCP. TIA for lending me your expertise.