Missing MAC addresses for domu VM's

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From: Brian Buhrow <buhrow_at_nfbcal.org>
Date: Tue, 28 Sep 2021 00:04:39 UTC

	hello.  Under Xen-4.14.0 and FreeBSD-12.2 running a command like:
netstat -bin
shows all the interfaces, including the virtual interfaces for the domU machines running on
that server, but the MAC addresses are all 0's on those entries that show the link level
address.  Is this a deliberate design decision or a bug that needs to be filed?
If it's a deliberate design decision, is there a way to get at the MAC address for a particular
domU and match it to a specific virtual interface on the dom0?
-thanks
-Brian