From owner-freebsd-net@freebsd.org  Wed Jun 29 11:47:27 2016
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Date: Wed, 29 Jun 2016 14:47:29 +0300
From: Slawa Olhovchenkov <slw@zxy.spb.ru>
To: freebsd-stable@freebsd.org
Cc: freebsd-net@freebsd.org
Subject: How to setup ethernet address and IPv4 address on interface?
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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?