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This commit implements Section 4.2 of <https://tools.ietf.org/html/draft-gont-6man-slaac-renum-05>, to improve the reaction of IPv6 SLAAC to renumbering events. Namely: * It honors PIO Valid Lifetimes < 2 hours, deviating from item "e)" (pp. 19-20) of Section 5.5.3 of RFC4862. [thaller@redhat.com: squash commits and adjust unit test] !454
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