You are kidding right?
On your RB you can turn off default forwarding to stop clients on the same AP seeing each other. You can also use the firewall to block ports 135 and 443-445 to stop NETBIOS communication between PC's on different routers. Do you just want to stop users from seeing each others computers in Network Neighbourhood? This will do the trick in that case.
Please correct me if I’m wrong.
Won't you create the hidden node problem by turning Default forwarding off?
So if you have a small network, 10 - 20 users this should work ok, but for larger networks this could cause some problems in peak times.
Regarding the firewall option.
It will work to block the above mentioned ports, between routers, but not for users connected to the same AP.
I would also like to know an answer to this as I'm experiencing the same problem. I know about nstream, but it won't work for my environment.
Is pppoe an answer (point to point links)?