On Saturday 07 May 2016 16:37:55 Jonathan Haws wrote:
[...]
> I am using the Yocto project to build my kernel/distro for my VMs, since
> that is what we use on our hardware.  Here is the output from those
> commands:
> 
> root@sierra1:~# ip link show dev bat0
> 6: bat0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state
> UNKNOWN mode DEFAULT group default
>      link/ether f2:52:c3:50:2e:d7 brd ff:ff:ff:ff:ff:ff
> 
> root@sierra1:~# uname -a
> Linux sierra1 4.1.18-rt15-yocto-preempt-rt #1 SMP PREEMPT RT Wed May 4
> 23:15:13 MDT 2016 x86_64 GNU/Linux
> 
> My guess, per Matthias next email in the thread, is that IPv6 is
> required, which I believe is not built into my kernel.  I'll see about
> adding that and try again.

Yes, this looks like the problem and this is why I've asked for the output. 
The excellent answer from Matthias should be enough to fix your setup :)

Kind regards,
	Sven