> Prefix translation has the potential to be stateless which is nice for resource management on the translation element, though. It really messes with protocol

> Prefix translation has the potential to be stateless which is nice for resource management on the translation element, though. It really messes with protocols where you need to tell another host how to contact you, though, since you don't know your "real" IP address without asking some other server. This gets worse if there is more than one level of translation involved. You also need hacks like "hairpin NAT" (wastefully passing local traffic through the router) since local hosts trying to connect to the public IP of a local server don't realize that they can reach it directly via the ULA. > … you might set up ULAs for local traffic, and use whatever prefixes are advertised for non-local traffic. This is the way.