[Bug 208241] [Hyper-V] VM network may not work over virtual switch based on wireless NIC

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=208241

            Bug ID: 208241
           Summary: [Hyper-V] VM network may not work over virtual switch
                    based on wireless NIC
           Product: Base System
           Version: 11.0-CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: decui at microsoft.com

I tried FreeBSD 11-CURRENT VM on Windows 10 host and found the VM network could
easily stop working about 5 minutes after the VM finished bootup.

After some debugging, it seems the host virtual switch has some issue for
wireless NIC. It seems if we change the default ARP expiration time from the
default 1200 seconds to 60s, the issue will disappear.

Details about the workaround:

Add "net.link.ether.inet.max_age=60"  into /etc/sysctl.conf and reboot the VM.

Or, "sysctl net.link.ether.inet.max_age=60" and "arp -d -a".

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