i am going to be renting out an apartment and want to give the tenant access to the internet with out allowing them access to my network. I am not sure how this could be done except to have 1 router that can link into a main router and allow tenant to only access that network - for example network a would start with a cable modem which would go into a route( a) where there would be 3 computers attached to it with another router(b) which is going thru router (a) to connect to the cable modem.