Im trying to configure my work router ( belkin 54g/n) so that we can have customers use out wifi point while waiting for their bike to be serviced. I have figured out that i can block ip addresses from accessing the internet by telling the router to stop access to port 80 and this seems to work. what port would i block (if this method is practical) if i want to stop that PC seeing the other machines on the network? I have found a list of ports but am unsure which one(s) i need to block to do this. any help would be great!