My client has two sets of IP range ( say 10.10,x.x + 10.20.x.x ), I
have to merge two IP sets to only one IP scheme ( finally, there is
only one IP range = 10.10.x.x in the network).

There are W2K AD network in the network individually.

Has anybody experienced this senario ?

How can I configure the DNS, WINS DHCP servers during the merger
without one failure ?

Thank you