Modify IP addresses ( 127.0.0.1 for local, or your public IP) in the server config files ( .ini or .xml ).
In October 2012, a user on the forums (a popular community for private server development) publicly released the original server and client files . Atlantica Server Files
Houses all character data, including levels, inventory items, rented mercenaries, quest progression, and skill points. Modify IP addresses ( 127
DropRateMultiplier : Adjusts item drop frequencies from monsters. Atlantica Server Files