Resolving behind firewall

Pluggers question po, how do I enable dns resolving behind a linux firewall? 
All users access their web thru a proxy. But all web java applet fails to 
connect, such as: go.icq.com & pse.org.ph's stock exchange.

Is it possible na from the users's dos can ping a domain w/o masquerading the 
entire ip block? Do I need to setup an internal DNS, NAT/masquerade port 53?

Jessjr


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