[Bug 289177] IPv6 temp address(es) with pltime=0 briefly loses deprecated on RA → OS may pick the old address as the source

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=289177

--- Comment #5 from Dmitry Nexus <fbsd.4f6a@nexus.tel> ---
(In reply to Marek Zarychta from comment #1)
Tested on a FreeBSD 14.3-RELEASE test system with the proposed patch applied.
Router Advertisements were sent at a high frequency (every few seconds).

For faster IPv6 temporary address rotation, I configured short lifetimes via
sysctl:
net.inet6.ip6.temppltime=600
net.inet6.ip6.tempvltime=1500

The system with multiple deprecated addresses was observed for 30+ minutes. The
flip-flop of the deprecated flag did not occur anymore.

Many thanks for the quick fix and support.

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