[Bug 265761] [patch] rtadvd(8) should also deprecate prefix on shutdown

From: <bugzilla-noreply_at_freebsd.org>
Date: Wed, 10 Aug 2022 16:53:39 UTC 
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=265761

            Bug ID: 265761
           Summary: [patch] rtadvd(8) should also deprecate prefix on
                    shutdown
           Product: Base System
           Version: CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: bin
          Assignee: bugs@FreeBSD.org
          Reporter: frank@pinky.sax.de

Created attachment 235827
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=235827&action=edit
deprecate prefix on rtadvd shutdown

When rtadvd is shutdown the router lifetime and lifetimes for DNS options are
set to zero in order to deprecate that information.

The same should be done for prefix information as shown in the attached patch.

With the patched version other hosts stop immediately the use of old prefixes
when rtadvd is restarted with new prefix information. Othwerwise we have to
wait for prefix expiry, which meanwhile may lead to non-working connection
attempts.

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