This is just asking for trouble. Internal clients should not use an external
DNS server for name resolution if at all possible. A split DNS system should
be used instead, where the internal DNS servers use the same domain name but
serve up the internal IP address.
External DNS servers, being external, are subject to way too much potential
abuse such as cache poisoning.
Ray
A common scenario where you would use DNS doctoring is when you have a
Public server on a DMZ and you would like for the machines on the internal
network to be able to access it using it's domain name, but using an
external DNS for the resolution, which off course resolves a public IP
address.
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