firewalled dns clients

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Greetings!
Thank to all of your help I was able to create a safe network behind an iptables firewall.
Now I need help again. 
How do I let the workstations do a nslookup?

          Internet
             |
             |
          Firewall
             |
             |
    -------------------------------
    |              |              |
    |              |              |
workstation    workstation    workstation




>From their windows workstation, I want to be able to let them perform a nslookup.

I tried this and nothing happened.
$IPTABLES -A INPUT -p tcp --sport 53 -j ACCEPT
even a
$IPTABLES -A INPUT -p tcp --dport 53 -j ACCEPT

Do I need a nat?


Cheers,


fritz <www.mesedilla.com>
---
+ Basta Ikaw Lord


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