[Bug 187203] [hyper-v] CARP protocol not work on HYPER-V 2012 R2

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=187203

--- Comment #7 from Xin LI <delphij at FreeBSD.org> ---
(In reply to andy zhang from comment #6)
Hi,

Is there a specific use case for the possible issue if SIOCGIFADDR is not
handled there?  Actually this is a follow up of changeset 277103 [1] which is
review request D1508 [2] and you may find additional information there.

My main reasoning is that the SIOCGIFADDR (get interface address) is used to
"observe" the interface object, or a "get" accessor, and semantically it
shouldn't bump the interface, like triggering an ARP broadcast, etc. like
SIOCSIFADDR (set interface address) does.  If we do it for SIOCGIFADDR too,
there may be some undesired behavior (e.g. an 'ifconfig' would cause the
interface to announce its IP address).

We can indeed add it back if there is good reason to do so, but I haven't yet
see one...

[1]
https://svnweb.freebsd.org/base/head/sys/dev/xen/netfront/netfront.c?r1=276750&r2=277103

[2] https://reviews.freebsd.org/D1508

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