I believe you can make your set of rules simpler if you introduce
a new lifetime (or condition if one needs something smarter than
a delay). I'll call it "regen lifetime" and when the regen lifetime
of an anonymous address expires then a new address is created, checked
by DAD then is used as the anonymous address, the old one is deprecated.
With this we can keep the current deprecated/invalid mechanism on RA
receptions (this is complex enough with the two hour rule and all the
side effects we can get from short lifetimes (mis)used for mobility).
Regards
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