[Bug 248172] if_tuntap(4): OpenVPN configuring tun/tap devices ends up with IFDISABLED interfaces

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=248172

--- Comment #14 from Gert Doering <gert at greenie.muc.de> ---
(In reply to Andrey V. Elsukov from comment #12)

rc.conf settings can not be the correct answer for spurious and
timing-dependent differences in behaviour.

Also, I can not control what our users will do (and they might not have IPv6 on
the LAN side, so might not have turned it on in rc.conf) - so I need a reliable
and robust way to bring up a tunnel interface with IPv6, independent of rc.conf
settings.

Adding some argument to our ifconfig call (or adding some extra ioctl()s or
whatever) is not a problem, but right now I need an extra "sleep(1)" before the
 "ifconfig $dev inet6 -ifdisable", which looks race'y and probably is...

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