The on going thread "Lets talk about firewalls" has brought up the fact that people believe there should be multiple NICs in a firewall. I'm not arguing with that fact.
However I do question whether or not these need to be physical interfaces, or if they can be logical (VLAN) interfaces. What if you are running a network where you are using ATM or Frame Relay. Do these logical interfaces suffice just as well as physical interfaces? This is of course presuming that you can ensure that no one will be on a VLAN that should not be, which is fairly trivial in a properly configured network.
Grant. . . .