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

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

--- Comment #17 from Eugene Grosbein <eugen@freebsd.org> ---
(In reply to Alexander V. Chernikov from comment #14)

I'm talking not about kernel behaviour only but abouth the whole complex of
generally used scenarios. Considering also the comment of rgrimes@, let's think
about following cases:

1) Some routing daemon installs to FIB some /32 route learned dynamically. It
may have its reasons and it should not fail unless there is already such PINNED
route in the FIB. Later some PPP daemon tries to assign that address to its
interface as address of local or remote side and it should not fail with EEXIST
but override non-PINNED route. It should fail with EEXIST if PINNED route
exists already.

2) Same in case of a routing daemon doing same things but route(8) instead of
another daemon trying to create a route or ifconfig(8) trying to assign same
address, they both should fail only due to existing PINNED route. They should
not fail otherwise and silently override possibly pre-existing non-PINNED route
including one installed by still running routing daemon.

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