On 23/01/2013 04:14, joel jaeggli wrote: > On 1/22/13 12:34 AM, Hannes Tschofenig wrote: >> Another example from a different area: Why do we need so many >> transition technologies for the migration from IPv4 to IPv6? Wouldn't >> it be less complex to just have one transition mechanism? > > You mean no transition mechanisms... That was, in fact, the plan (dual stack during coexistence). It went wrong. Brian