[Bug 256393] Issue with recreation of ppp/tun interfaces

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=256393

--- Comment #33 from Eugene Grosbein <[email protected]> ---
(In reply to Alexander V. Chernikov from comment #11)

It seems the problem is same as in my old PR:
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=223129

The problem was fixed back in 2017 with introduction of PINNED routes with the
following patch:
https://bz-attachments.freebsd.org/attachment.cgi?id=187334

But it broke again in times of 13-CURRENT.

Note, one does not need PPP to reproduce the problem. I have it with
13.3-STABLE/amd64 with a pair of gif(4) interfaces and OSPF running over my
network. 

If OSPF installs IPv4 /30 prefix received over gif1, I cannot assign the prefix
to gif0 anymore. It worked just fine with FreeBSD 12.

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