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? -e -----Original Message----- From: Jason Greenberg [mailto:jg@execulink.com] Sent: Wednesday, August 06, 2003 12:36 PM To: nanog@merit.edu Subject: Server Redundancy Can I have some suggestions on how to load balance servers that are on seperate IP blocks? Is there any way to perform translation at this level? Exclude DNS based balancing please... -- Jason Greenberg, CCIE #11021 Network Administrator Execulink, Inc. <jg@execulink.com>