From owner-freebsd-net@freebsd.org  Wed Jun 29 12:01:48 2016
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Date: Wed, 29 Jun 2016 15:01:52 +0300
From: Slawa Olhovchenkov <slw@zxy.spb.ru>
To: Kristof Provost <kp@FreeBSD.org>
Cc: freebsd-stable@freebsd.org, freebsd-net@freebsd.org
Subject: Re: How to setup ethernet address and IPv4 address on interface?
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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.