I have some PCs that I need to be able to connect to my home network that I do not want to access the internet, but I do want them to access my LAN to access other PCs files. How can I set the firewall to LAN-Only mode?
If possible, I'd prefer to be able to switch on-the-fly, so I can change the configuration to temporarily access the great internet when I need to update some programs, but if its set to LAN-only never-internet I can live with that too.

Thank you.