DNS spoofing

[Rob Z]

Hello,
we need to deliberately point some of our DNS clients to a host with a
different IP.
Basically, when a client on a certain subnet asks for a
host.somedomain.comthey should get an address for
host.mydomain.com.
All other DNS information for somedomain.com must be valid for all of my
clients.
I have no control over somedomain.com DNS but I have full controll over our
DNS servers.
What is the best way of doing this with bind?  What are other ways of doing
this (eg modify local resolvers)?
Any ideas are greatly appreciated.
--
Rob
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