In your letter dated Wed, 27 Jul 2011 21:56:51 -0400 you wrote: > In the absence of a coherent instruction from IETF for a phase-out > plan, declaring this protocol historic under the current proposed > language, will do precisely that. Please please please, if IETF > wants 6to4 to die, then publish a phase-out plan so that the > current users of 6to4 can have fair warning before the relays go > dark and forthcoming hardware/software upgrades rip the feature > out from under them. I would hope that big companies like Apple would actually do an impact analysis before removing a feature. Big content providers can measure how much 6to4 is enabled, so they can probably say something about trends. But that doesn't say much about how many users actually care about 6to4. Vendors seem to be best equiped to analyse the users' need for 6to4. I don't think relay operators have expressed a desire for a specific cut off date. So I guess they just figure out for themselves when to switch off the relays. _______________________________________________ Ietf mailing list Ietf@xxxxxxxx https://www.ietf.org/mailman/listinfo/ietf