> I would be a bit nervous about dedicating another /3 for unproven > use. There's a risk of it ending up unusable like Class E. So > if we are going to do this, doing it inside 2000::/3 seems a > bit safer to me. So what if we could say the use is simply to assign addresses out of this block that stay relatively permanent to a device that sources packets from this address. The address has no dependency on the topology the device connects to, the number of interfaces the device has connected to the network, or even if the device is connected at all to the network. So this proposal doesn't have to be associated with LISP or any other mechanism being used. This block could be used today as simply a PI block if no new mechanism is deployed. And if a sub-block of this prefix is used for LISP purposes, then so be it. And I don't think we have to jump in with 2 feet and allocate a very coarse prefix for this. Dino