FreeBSD 11 - Bhyve - Spoof MAC address

[James Lodge]

>
>> On Jan 4, 2016, at 9:32 AM, James Lodge <James at Lodge.me.uk> wrote:
>>
>> Hi All,
>>
>>
>> I'm just getting started with Bhyve. So far everything is working as expected. My original goal was to be running Ubuntu 12.04 i386 as I need it for a particular project. One issue I'm having is MAC address spoofing. I'm aware I can change the MAC address within Ubuntu but I'd like to configure the tap interface from the host which should be possible according to man pages.
>>
>>
>> Bhyve Man Page: https://www.freebsd.org/cgi/man.cgi?query=bhyve&sektion=8
>>
>>
>>
>> The issue I have is that by setting the below, the vm boots, I can console via null modem, but there is no eth0 interface, only the loopback. Removing the static MAC, reboot and everything is present and correct.
>>
>>
>> -s 2:0,virtio-net,tap0,mac=xx:xx:xx:xx:xx:xx
>
> It looks like you are setting the MAC correctly on your bhyve command line and bhyve is running; so far so good. Is it possible that Ubuntu has a different MAC saved for its idea of eth0 and is therefore not doing what you expect? (Perhaps udev is renaming the device?)
>
> Can you run these two commands within the VM and post the output?
>   ip link show
>   lspci
>
>
> JN
>
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>
>That is the most likely scenario
>
>try 'ifconfig -a' and see if there is an eth1 with no configuration
>
>--
>Allan Jude
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Thanks Guys

Exactly that. By spoofing the MAC Ubuntu populated another interface 'eth1' hidden (surprisingly to myself) as it had no L3 config in /etc/network/interface and administratively down, only for eth0. Thanks also to pr1ntf in the Bhyve channel.

Regards
James