> > But in the general case the network cannot. > Think host multi-homing. >
Yes or no. Generally speaking the races of IPv6 and IPv4 connections on both network and client are going to be suffered by netowrk dynamics, including Multi-homing, route flaps, roaming, or other network falilures. Extremely, a client can get a better IPv6 connection in one second (when IPv6 win the race), and lose it in next second. In such case, more sophisticated measurement should be done(on client or network) , for a longer period, on statistics of RTT and Failure rate, or combinations of them. But in IMHO, the assumption of HE is relatively stable network for short exchange connections. The dynamics exits but relatively rare or no notable impact on HE. So I see no such discussion in RFC8035. Davey
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