> Yes, the issues with an unconditional "prefer IPv6" approach > have been noted, and operating systems of the vintages you > mention certainly deserved criticism. In fact this has been a > major focus of IPv6 operational discussions, and lies behind > things like the DNS whitelisting method, the happy-eyeballs > work, and my own RFC 6343. > Old news; unfortunately it means you need new o/s versions. > Disabling 6to4 and Teredo unless they are known to be working > well is a good start, however. Old news perhaps, but an unavoidable consequence of this is that the oft-repeated assertions that various systems have been "IPv6 ready for over 10 years" don't involve a useful definition of the term "ready". Ned _______________________________________________ Ietf mailing list Ietf@xxxxxxxx https://www.ietf.org/mailman/listinfo/ietf