External IP not shown as IP address

[Ericode]

Hello, I have a server behind a firewall. As the servers ip, I put the internal ip and as the firewall, I am putting the external ip to the firewall. When I create a game server, it tries to use the lan IP for the server instead of the external IP. It won't let me create the server this way. When I import the ip's to the server, the lan ip's show up but not the external IP. Do you know why it won't show the external ip?

[goatboynz]

add your ext ip in servers/Firewall IP:

[Ericode]

add your ext ip in servers/Firewall IP:

 

Thanks for your reply. I did add my external IP to the firewall box and I added my server's internal ip under the servers IP and when I create a server, it gives me the lan IP instead of the global IP. (I have a barracuda x100 firewall)