I'm looking after a network for a company that often rents office space to other businesses, sometimes at short notice. It would be useful to be able to offer a secure, separate network to these clients with little or no lead time.
What I'd like to do is have a router that could take a block of external static IPs (lets say 4) on a single ADSL connection and make each available on one of it's LAN ports. Obviously, none of the clients on one LAN should have access to any of the other LANs.
Ideally, the router would be able to provide DHCP for each LAN, or simply operate as a bridge so that another router could be used, if necessary, for the new company.
This seems like a simple enough request but none of the SOHO routers with which I'm familiar can apparently be configured in this way (even my Draytek which can support separate VLANs on each of it's physical LAN ports).
What sort of equipment do I need for this? Is there a better and / or definitive way of creating such a setup?