Router for external IP's
Consider such a situation:
ISP sets up OmniStack switch in which the first port has for example 20 external IP's.
I have HP ProCurve 2650 switch. Cable goes from OmniStack first port to ProCurve, from ProCurve cable goes to FreeBSD routers first NIC. FreeBSD router has two NIC's. First NIC has for example "ext1" IP address, in natural situation for second NIC I would give one of the LAN IP's, and the servers which connects to the ProCurve switch could have LAN IP and EXT IP. But what to do if I don't want to give LAN IP to FreeBSD router second NIC? I don't want LAN IP's at all, I just want to make FreeBSD router to act like external IP's router. In such situation, what should I set for the second NIC of FreeBSD router?