When you remove a scope in DHCP manager and define another one, Microsoft DHCP clients will not automatically renew their lease.
To force lease renewal:
1. If you have W95 clients, you must copy Ipconfig.exe from WFW 3.11 to C:\WINDOWS, prior to running the script.
NOTE: If you have Winipcfg.exe version 4.10.1656 or later, you don't need to get Ipconfig.exe.
2. Add the following code to your logon script:
if /i "%OS%"=="Windows_NT" goto IPCFG if EXIST C:\WINDOWS\IPCONFIG.EXE goto IPCFG if EXIST C:\WINDOWS\WINIPCFG.EXE goto W98 goto IPCFG :W98 C:\WINDOWS\WINIPCFG.EXE /RENEW_ALL goto end :IPCFG IPCONFIG.EXE /RENEW :end