[Bug 229990] FreeBSD 11.2 on Hyper-V: hn0: network changed, change 1

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=229990

            Bug ID: 229990
           Summary: FreeBSD 11.2 on Hyper-V: hn0: network changed, change
                    1
           Product: Base System
           Version: 11.2-STABLE
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: kern
          Assignee: bugs at FreeBSD.org
          Reporter: bazald at gmail.com

I am attempting to run FreeBSD 11.2 under Hyper-V on Windows 10 1803. I have
tried both Gen 1 and Gen 2 virtual machines, as well as both legacy and
non-legacy network adapters under Gen 1, and networking seems to be difficult
to get right, at least with Wi-Fi.

The only configuration that seems to work at all is using a Gen 2 VM
(non-legacy network adapter). I initially attempted to use a virtual switch
configured to access the external network, with sharing allowed, and I quickly
got MAC collision errors. I'm uncertain as to whether that's the expected
result.

Moving on to the default switch, sharing my Wi-Fi with that, I seem to have
working Internet access. I added "net.link.ether.inet.max_age=60" to
/etc/sysctl.conf, which seems to be important for maintaining the connection.
As a new FreeBSD user, it is distressing that
https://docs.microsoft.com/en-us/windows-server/virtualization/hyper-v/best-practices-for-running-freebsd-on-hyper-v
fails to document that it truly ought to be added to /etc/sysctl.conf.

Finally, even with this apparently working connection, we get to the bug I'm
actually here to report. I'm still getting flooded with "hn0: network changed,
change 1" messages on the terminal. The patch at
https://reviews.freebsd.org/D8295 seems to be to blame? I believe
NDIS_NETCHANGE_TYPE_POSSIBLE is being reported to the console, and perhaps
correctly so given the networking issues with Hyper-V, but some method to at
least suppress the messages would be most welcome.

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