Is it possible to specify a fallback NS?

linuxnewbie1234 linuxnewbie1234 at
Sat Oct 21 21:40:14 UTC 2006

Suppose I have a company ONE for which I am serving the domain
I know the A addresses of a computer like
however my company recently splitted and now there is an independent 
branch, which is  .

At TWO-ONE They have their computers (e.g., and their 
NS which is . All the IP addresses can change without 
them informing me. In addition they can split further and make a 
THREE-ONE branch with the domain . TWO-ONE will be 
informed of the split but not me.

Since I have the top level NS BUT I don't have control on 
what the other people do, is there a way to configure my zone file so 
that for everything of the form it first goes looking in my 
zone file and then if this finds nothing, either
-goes asking recursively to OR
-tells the client to refer to

Note that I cannot simply put an NS entry specifying NS because if they split again forming "three" I wouldn't 
catch that one. I really want a fallback on if the 
computer is not found in my zone. Is that possible?


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