There seems to be a very high rate of MAC address collisions when tap is
running on different machines.... is there anyway to make the selection of
MAC more random
Do you mean, tap(4) when used with bhyve ? If so, bhyve calculates the
MAC address for adapters based on an md5 hash of the PCI slot/function
and VM name. If you use the same bhyve configuration on a different
machine, the MAC address will be the same.
If that's the problem, you may want to supply your own MAC address
with the "mac=" parameter on the command line e.g.
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