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Quick Split DNS Question

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Quick Split DNS Question - 14.Jul.2011 6:44:13 AM   
ChrisLowe

 

Posts: 4
Joined: 30.Oct.2009
Status: offline
Hi everyone,

I currently publish a number of web resources through ISA 2006 which is all working well but I have an issue with internal access to some of the resources.

At the moment internal clients request a web page which goes out the the DMZ to the ISA which is publishing the internal server. So to make my internal clients go directly to the internal server that the ISA is publishing for I need to setup split DNS.

So if I put in split DNS on both the public and internal DNS servers I create a zone on each for example.com.

In the public DNS I have A records pointing to the external IPs for the following

www
webmail
portal


In the internal zone for example.com I only want to resolve the following A records to the internal IPs

portal
webmail

Here's the question:

What happens when an internal client does a DNS lookup for www from the internal DNS server ? Does it return a not found or can the DNS server be setup to go out to the external DNS for anything that it doesn't know about ?

Do I also need to create www in the internal zone and just give it the same IP as the external zone has ?

This is OK when there are only a few in the public DNS zone but there are 60+ which I'd rather not have to create again and maintain in 2 places.


If anyone has any advice on this I would be very grateful

Thanks very much.

Chris.
Post #: 1

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