IPTables and DNS

[p p]

Hi, Im setting up a DNS server and am having trouble getting through the 
firewall. Im able to use the server as a dns server from another machine if 
I stop the iptables service. Ive tried setting a rule to allow tcp on port 
53 through, but it still not working. Any ideas?  Sorry if this is the wrong 
list for this subject. I didnt see a list that seemed appropriate though.  
Thanks in advance to anyone that can help. This is on RH Enterprise by the 
way. Thanks again.