Hi John,

I upgraded the host from freebsd-10-RC3 to 10.1-R and after that
upgraded bhyve to grub2-bhyve-0.30 today and since then I've found that
when booting ubuntu 14.04.1 LTS guests, the ethernet interface (ethN
where N is a number) is now variable. This is an issue because if I stop
a VM and say reboot the host, I have to hack about with the VM instead
of just booting it.

Previously the VM always saw the virtual network interface as eth0. Now,
it's anything but that. bhyve has been upgraded, the VM hasn't. How can
I control this behaviour? I want eth0 to remain as eth0. These are all
VMs that were eth0 before the bhyve upgrade. It doesn't appear to matter
what tap interface is used. I don't have this issue with freebsd guests
on the freebsd host, just ubuntu 14.04.1 LTS.

I define the bridge and 9 tap interfaces at boot, in case this is
relevant. Please can anyone shed some light?

Was the name of the VM changed when doing the upgrade ? If so, that will modify the MAC address, which confuses Ubuntu.

The MAC addresses generated for an interface are derived from an md5 hash of the PCI slot/function and VM name, so they should be unique for each port and VM on a system. If the VM name is changed, or the slot configuration of a virtio-net device is changed, the MAC will also be changed.

bhyve does provide the ability to set the MAC address for an interface, but granted this isn't available as an option with vmrun.sh :(



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