DNS and ISA

I am looking for any article or document exaplaining when and how to
configure ISA for DNS resolution.
I understood that I must configure a DNS server address on the external
(Internet) interface of the ISA server if:
- IE clients in the intranet are configured to use ISA as their proxy
- clients in the intranet use an internal DNS server configured with a DNS
server in Internet as its forwarder
- clients are configured as firewall clients
What else?
Is it correct?
Regards
Mario


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