[Bug 199136] [if_tap] Added down_on_close sysctl variable to tap(4)

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=199136

--- Comment #4 from yuri at rawbw.com ---
> can you use some of IFF_LINK flags to implement the needed feature?

You mean one of IFF_LINK[0-2]? I guess this is possible, but this would require
someone setting such flag on tapN interface. The way with sysctl variable is
more in line with existing "uponopen" variable (similar, but for close event).
Also it introduces the new default that better corresponds to the needs of most
apps (I believe). So I think sysctl variable is better.

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