Firewall Wizards: dns outbound

[Deepak Vaidya <dvaidya () clark net>]

Hello,

This is going to be a stupid question, but I hope someone can answer the
question without my being flamed :-(.

I have gotten a request to allow all clients behind a firewall to have
unrestricted access to dns servers outside the firewall.  

Can I get help in coming up with pros and cons off doing that.  I tried to
search the archives but the search page is not working properly.

I am not comfortable in allowing udp packets outbound from all systems.
If it helps we are using firewall-1.

Thanks
- Deepak