Prevent 1 computer on the network from communicating with the rest of the LAN?
What is the best way to achieve this?
I have 1 computer on the LAN I want nobody else to be able to communicate with.
I've created a rule in the firewall on the LAN such as this: IPv4 * 192.168.99.3 * * * * none
and I even went in and reset the states but that doesn't seem to stop it from being able to browse smb shares on the network. It does stop it from going to websites though.
The only thing this machine needs is access so that people internally and externally can RDP into it and that is it.
I imagine since it's inside the LAN itself, the firewall isn't able to block communication say between 192.168.99.3 and 192.168.99.10? If thats true then what would be a good idea? I guess VLANing that port? :/
That has to be handled in your switch, as you surmise. Your router isn't involved in same-subnet traffic.
Else yes you need to put the host you ant to restrict on another interface/subnet and pass only what you want it to have access to.
Yup if you need to isolate client A from client B you need to put them on different vlans/network segments and then pfsense can firewall/route that traffic for you.
Or get a switch with port isolation (even the cheap TP-Link gig switches have it). Then they can only talk to the gateway and never to each other (on ports where you have that set).