Koha has web interface and can easily make available Staff Client and OPAC in the institutional / library network. Then library users can access OPAC from their seats. Library staff can use Staff Client from other client PCs. Make sure that the Koha installed computer inside a LAN (Local Area Network). Following things should try from Koha installed PC.
1. Identify IP and Netmask of the PC
Open a Terminal and apply following command.
Note down the IP address and Netmask.
e.g. IP address- 192.168.1.25
Netmask - 255.255.0.0