Hopefully this works for you,
1.) Navigate to
http://192.168.1.12.) For default settings leave user name blank and enter a password of admin.
3.) Download your manual
http://belkashop.com.ua/products_files/WRT160N_ug.pdf4.) Page 8, follow directions for "DHCP Reservation". Look for the name of your PC/Server and click add client. Note the current IP address.
5.) Go to page 19 and follow the directions for "Applications and Gaming > Single Port Forwarding". Use port 8080 and forward to your IP address noted in step 4.
DHCP hands out IP addresses to computers on a network. Sometimes it gives out different addresses so step 4 reserves the same IP every time so forwarding will continue to work.