In article <9637bbf6-82a2-c94d-0b3d-238501e7679a@xxxxxxxxx> you write: >I am not at all clear on the upside. > >We should make declarations about IPv6, but remain silent on IPv4. The bit about not adding anything to IPv4 unless we also add it to IPv6 is OK, but I also can't find much merit in the rest of the document. We have been telling people that IPv6 is wonderful for over 20 years, and they're still using v4. It would be a lot more effective to make v6 actually wonderful, than to try to browbeat people into abandoning their working v4 systems. For an example how how we might improve v6 wonderfulness, see Geoff Huston's recent blog post on how badly v6 fragmentation works with large DNS responses like you get with DNSSEC: https://blog.apnic.net/2017/08/22/dealing-ipv6-fragmentation-dns/ R's, John