Hi Aryeh,

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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