I want to stay connected to the LAN while disconnected from the Internet. How to do this for, A) an individual device B) all the devices Thanks in advance.
One way, block internet access for one/all devices in the router. How? Depends on the model of the router. Another (not sure if it will work), set static address on the devices and wrong Default Gateway. Either non-existing address or address of a device that doesn't do routing. For both IpV4 and IpV6 protocols.
I tried to set this up but couldn't. Actually I'm not sure how to use IPv6. Anyway thanks for the suggestion.