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IPv6 SLAAC: Clamp received PIO and RIO Lifetime Values

Fernando Gont requested to merge fgont/NetworkManager:fgont-cap-ltimes into master

This commit implements Section 4.1.2 of https://tools.ietf.org/html/draft-gont-6man-slaac-renum-05, to improve the reaction of IPv6 SLAAC to renumbering events.

Namely:

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

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

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