[help] no hamach in the server

i have a modem and i made my private gunz server but i used a hamachi

my friends need hamachi to play

but now i want to make the game without hamachi so what to do ??

( i have a modem not router so the ip will be change every disconnect -
connect) so what to do

i want the game work without hamachi

get a wireless internet to have a static ip
btw router nd modem are the same
my ip cahnges nd i have a router

i dont want a router and dont want a static ip

does any one know a free domain have a static ip ??? ( the free domain )