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
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