Setting LAN wifi access only.
Discussion
depends what level of no internet you want, and if you have multiple subnets on the lan.
If you simply don't configure a gateway/default route, you will only be able to connect to devices in that subnet.
This is very easy to do if you are able to set a static IP
The main problem with this approach is you are not blocking access to the internet, just not configuring it, there is nothing stopping a user with enough privileges to add routes to add it themselves and gain access to the internet.
To fully block access you need to use firewall rules, and you will have difficulty locking things down sufficiently if you want other clients on the same logical network to have internet access.
If you simply don't configure a gateway/default route, you will only be able to connect to devices in that subnet.
This is very easy to do if you are able to set a static IP
The main problem with this approach is you are not blocking access to the internet, just not configuring it, there is nothing stopping a user with enough privileges to add routes to add it themselves and gain access to the internet.
To fully block access you need to use firewall rules, and you will have difficulty locking things down sufficiently if you want other clients on the same logical network to have internet access.
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