[Bug 243703] fe80 route need to add manually and NDP doesn't populate itself

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=243703

--- Comment #2 from Alexander V. Chernikov <melifaro at FreeBSD.org> ---
I guess it'd be quite a delayed reply.

What does `ifconfig tap0 inet6` show?

I suspect it contains IFDISABLED for IPv6.

With `ipv6_activate_all_interfaces="YES"` in /etc/rc.conf and
net.inet6.ip6.auto_linklocal=1 (default)

it seems to work on -HEAD:
23:49 [2] m at devel2 s ifconfig tap5 create
23:49 [2] m at devel2 s ifconfig tap5 inet6
tap5: flags=8802<BROADCAST,SIMPLEX,MULTICAST> metric 0 mtu 1500
        options=80000<LINKSTATE>
        nd6 options=21<PERFORMNUD,AUTO_LINKLOCAL>
23:49 [2] m at devel2 s ifconfig tap5 up
23:49 [2] m at devel2 s ifconfig tap5 inet6
tap5: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 1500
        options=80000<LINKSTATE>
        inet6 fe80::5a9c:fcff:fe00:7021%tap5 prefixlen 64 scopeid 0x8
        nd6 options=21<PERFORMNUD,AUTO_LINKLOCAL>

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