RE: Server Redundancy

It really depends on the application. I've seen a couple of boxes
(IIRC, the one that the client bought was from cisco) that do "sticky"
load balancing that associates the source address with the NAT
translation and does round-robin nat to several internal servers...
Come to think of it, most services depend on some sort of round-robin
NAT. Can you tell us a little more about your application?