How to setup ethernet address and IPv4 address on interface?

[Slawa Olhovchenkov]

On Wed, Jun 29, 2016 at 01:51:40PM +0200, Kristof Provost wrote:

> On 29 Jun 2016, at 13:47, Slawa Olhovchenkov wrote:
> > I am trying to change MAC address and setup IPv4 address and got
> > error:
> >
> > # ifconfig em1 ether 00:30:48:63:19:04 inet 192.168.2.1/24
> > ifconfig: can't set link-level netmask or broadcast
> >
> > Is this posible?
> 
> Yes, but you can’t do both in one call.
> 
> This works:
> ifconfig em1 ether 00:30:48:63:19:04
> ifconfig em1 inet 192.168.2.1/24

I am need in one call, multiple commands not allways allowed.
Using /etc/start_if.$IFNAME produce side effects and can mask errors
in rc.conf.