From owner-freebsd-net@freebsd.org  Wed Jun 29 11:51:46 2016
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From: "Kristof Provost" <kp@FreeBSD.org>
To: "Slawa Olhovchenkov" <slw@zxy.spb.ru>
Cc: freebsd-stable@freebsd.org, freebsd-net@freebsd.org
Subject: Re: How to setup ethernet address and IPv4 address on interface?
Date: Wed, 29 Jun 2016 13:51:40 +0200
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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

Regards,
Kristof