Bind and firewall

[Charles Bodley]

I currently have a redhat 7.1 bind 9.1.2 Behind a firewall. I have forwarded
port 53 both tcp and udp from the external IP 216.143.228.194 to the
internal 192.168.5.50. Even with the port forwarded I cannot get bind to
resolve anything. Just as a test I'm resolving hp.com. this works from other
boxes on 192 network but not from the external IP. Can anyone think of what
I've missed?