[Koha] how to access(ubuntu) koha 3.0 opac from client system(windows)

I've installed Koha in a machine "A" ( IP - 192.168.1.2 ) ubuntu Now I'm trying to access the modules OPAC on INTRANET from another machine(windows) "B" (IP - 192.168.128.66).but both are in LAN and communicating What should i do to access OPAC from client pc (windows)