Redirection Internal --> public IP --> Internal

[zinfo]

Hi,

here is my setup :
Some entry in the DNS return my public IP address, and I would like to rediect acces from my internal net to a server located in my internal network.

More detail here:
eBox public interface : eth0
eBox internal interface : eth1
1) internal client want to connect to dev.exemple.com
2) dev.exemple.com resolv with the public IP address (eBox eth0)
3) internal client attempt to connect to the public IP address
4) internal client timeout and can't connect.

How can I resolv that?

Thank you.