The landlord buys Internet access which comes in through the router (RUTX08) and it is then sent out to each tenant through a coax network together with cable TV, each tenant then has their own wifi through 100/100 Mbit / s, and some tenants have their own router so these will not affected by this as they have their own network after wan port.
But the tenants who do not have their own router get their IP numbers directly from RUTX08 and therefore they can see other computers in the network and we dont want that. So all the tenants use the same public IP number from the ISP.
Regards