I have a RedHat Linux 7.1 system running an iptables based firewall.  The system has one LAN NIC (static IP) and two WAN NICs (with public static IP addresses).  We have external DNS entries that point to one of the two WAN NICs.  The firewall port forwards to internal computers running web etc.  My problem is that I cannot reference these internal systems by the registered DNS names from inside the firewall.  Everything works fine on the outside.  What rules do I need to add to my iptables config to make this work.
 
thanks! 

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