Hi choidk,
For your char_athena.conf, I would recommend the following settings...
login_ip: 127.0.0.1
char_ip: <domain>.no-ip.com
And as for the map_athena.conf,
char_ip: 127.0.0.1
map_ip: <domain>.no-ip.com
Make sure that you have enabled port forwarding on ports 6900, 6121, 5121 for your LAN IP: 192.168.1.100. Then in your clientinfo.xml, use the <domain>.no-ip.com hostname for your clients to connect.