Microsoft Windows XP [Version 5.1.2600] (C) Copyright 1986-2001 Microsoft Corp. C:\WINDOWS>netsh ras ip set addrreq ?
set addrreq [mode = ] ALLOW|DENY
Specifies whether dialin clients are permitted to request their own
IP addresses.
mode - the mode
ALLOW - allow clients to request their own IP addresses.
DENY - don't allow clients to request their own IP addresses.