Iljitsch van Beijnum wrote: > The multi6 wg has been working on locator/identifier separation as a > way to solve the multihoming in IPv6 problem for a while now. > > The problems we're facing (apart from the fact that there are > many ways > to skin this particular cat and everyone has a different > preference) is > that additional mechanisms are needed to get the extra information > across, and there is a price to be paid in one or more of: additional > round trips, more dependence on the DNS or something similar to DNS, > additional per-packet overhead, loss of backward compatibility, > increased complexity. > At least the backward compatibility issue is primarily due to trying to force a lower layer to mask the topological realities. There may be some need for additional round trips, or enhanced mapping infrastructure, but if that only applied to apps using a new stabilization layer, there wouldn't be as much complaint because those would see a clear benefit. In any case I don't think adding a layer will be a trivial task, but from here it looks like the least the path of least resistance. Tony