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Improve the reaction of IPv6 SLAAC to renumbering events

Fernando Gont requested to merge (removed):master into master

This commit implements Sections 4.1.2 and Section 4.2 of https://tools.ietf.org/html/draft-gont-6man-slaac-renum-05

Namely:

  • It caps the Preferred Lifetime of PIOs to the "Router Lifetime" value present in the Router Advertisement Message, and the Valid Lifetime to 48 * Router Lifetime.

  • It honors PIO Valid Lifetimes < 2 hours, deviating from item "e)" (pp. 19-20) of Section 5.5.3 of RFC4862, to allow for timilier reaction to renumbering events.

Additionally, it also caps the Valid Lifetime of RIOs to "Router Lifetime".

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