On 12/11/2016 14:15, Randy Bush wrote: >> Right now it seems that you have got a solution proposal >> for a problem, that is IMHO not very clearly described. > > how about ipv4 and ipv6 are incompatible on the wire and this > has created a multi-decade ipv6 charlie foxtrot? Yes, I suggest mentioning that to Vint, Bob and a few others in 1977, so that they can design IPv4 with extensible addresses. People in 2016 will be grateful. Brian