Thank you for this guide. However, my friend cannot connect to my server. BUT I can connect from my Laptop to my Desktop (rAthena Server) using my WAN IP.
Here's my settings:
Server:
Using default ports 6900, 6121, 5121, ports open on my router.
char_athena.conf
login_ip: 192.168.2.6 <-- LAN IP
char_ip: My WAN/Public IP
map_athena.conf
char_ip: 192.168.2.6 <-- LAN IP
map_ip: My WAN/Public IP
Client:
clientinfo.xml --> already change to <address>my WAN/Public IP</address>