is the server being hosted on your pc?
If yes to the previous question, are your map, char, and login server set to use your WAN IP or 127.0.0.1 (note:this is a redirect IP back to your computer also known as localhost)?
If yes to the WAN IP... um.........I am not sure.
If NO, and those are set to 127.0.0.1/localhost then you should only need to change the IP in their respective files in the conf folder [map_athena.conf + char_athena.conf + subnet_athena.conf + inter_athena.conf]
These files should all use ONE IP, EITHER ALL WAN OR ALL LAN! :]
subnet should be 255.255.255.0:[WAN IP]:[WAN IP] if I understand all this.
Hope this helps, also just a friendly reminder this type of question is asked and answered often around the forums, so in an effort to keep the peace and avoid many angry/hostile replies, if you haven't already, use the search bar in the top right. Or search it in google with rathena sprinkled in at the beginning. The google method has helped me tons.
Let me know if this works for you okay?