IPv6 SLAAC: Honor small PIO Valid Lifetimes

Closed Fernando Gont requested to merge fgont/NetworkManager:fgont-small-vltimes into master

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.


  • It honors PIO Valid Lifetimes < 2 hours, deviating from item "e)" (pp. 19-20) of Section 5.5.3 of RFC4862.

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