I realize that this is more of an IETF issue than a NANOG one, but, I'd like to find a couple of people with some protocol background and a strong operational background that would be interested in trying to see if we can come up with a way to develop a version of IP which did not require a flag day, but, would facilitate a transition towards an IP where the End System Identifier (Host Address) could be globally unique to a given system (think PI space) and essentially a layer 4 construct, but, the Routing Tag (Network Address) could, instead, be dynamically determined and separate information. I'm thinking along the lines of a new protocol which could look up an End System Identifier against a local server and receive a response which was a list of valid Routing Tags for that destination. Sort of a cross between DNS and ARP. I don't want to ignore security and would like to see at least the option if not requirement to crypto- sign the information. Ideally, I'd like to find a couple of people in the Bay Area so we can get together for a white-board discussion. I've got a few ideas rattling around in my head about how it might work, but, I'd like to collaborate with some others before proposing something to IETF. I figured NANOG was a good place to start looking for OP-EX relevant to this issue. Thanks, Owen -- If it wasn't crypto-signed, it probably didn't come from me.