Is this possible?

[Guv]

Is it possible to have a wirelss access point set up so anyone connected to it only has access to the internet via the router and not network shares on computers on the network?

The access point is a Netgear WG602

 

[Guv]

I can't see any isolation mode.

If changing the subnet will work then I'll do that - sounds simple enough

Can I change it to anything I like or does it need to be in the format 255.xxx.xxx.xxx?
Can xxx be anything?

thanks for your help