https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=196361

--- Comment #12 from Alan Somers <asom...@freebsd.org> ---
(In reply to jhujhiti from comment #11)
Regarding same_ip_multiple_ifaces_fib0, the configuration isn't valid.  But
that's not the point of the test.  As the comment and the PR say, the point of
the test is just to make sure you don't panic if you try to configure a system
that way.

For that matter, assigning the same IP to different interfaces on different
fibs (as same_ip_multiple_ifaces) tests doesn't really make sense either, but I
added a test case for it because it worked on older versions of FreeBSD and
some people were actually using that feature.  But the situation is much more
interesting with IPv6 because of the concept of scopes.  With IPv6, it makes
sense to assign the same address to multiple interfaces, as long as their
scopes are not overlapping.  They can even use the same FIB.  For example, the
same link-local address can be assigned to two different interfaces, as long as
they're on separate networks.

Since these patches are starting to get fairly complicated, could you please
create an account at https://reviews.freebsd.org/ and upload the patches there?
 It's far easier to review patches there than on Bugzilla.

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