From owner-freebsd-questions@FreeBSD.ORG  Sun Jan 23 03:05:17 2011
Return-Path: <owner-freebsd-questions@FreeBSD.ORG>
Delivered-To: freebsd-questions@freebsd.org
Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34])
	by hub.freebsd.org (Postfix) with ESMTP id 38BE3106564A
	for <freebsd-questions@freebsd.org>;
	Sun, 23 Jan 2011 03:05:17 +0000 (UTC)
	(envelope-from prvs=0997c54d95=johnl@iecc.com)
Received: from gal.iecc.com (gal.iecc.com [64.57.183.53])
	by mx1.freebsd.org (Postfix) with ESMTP id A73248FC14
	for <freebsd-questions@freebsd.org>;
	Sun, 23 Jan 2011 03:05:16 +0000 (UTC)
Received: (qmail 4385 invoked from network); 23 Jan 2011 02:38:34 -0000
Received: from mail1.iecc.com (64.57.183.56)
	by mail1.iecc.com with QMQP; 23 Jan 2011 02:38:34 -0000
DKIM-Signature: v=1; a=rsa-sha256; c=simple; d=iecc.com;
	h=date:message-id:from:to:subject:mime-version:content-type:content-transfer-encoding:vbr-info;
	s=4a9b.4d3b94aa.k1101; i=johnl@user.iecc.com;
	bh=82aY1CxoxI1UukI6+LNJEFw6zoq3Oaj54UXCP2oDTZw=;
	b=K2PO/ZsgPQHj6+AFItpQ4i7x46hZHgfAV/xUy/wnkimXTes68iZIH0auBfJmpUEUsune8VpemIQ2pDAs1ySMGkCwl5SwsmktvaDGGgaeMKG1I/JeZxMNOK9ragKEEcTde241PI6cO/jP0QOKn6Q8psqIKTmKHi2HTz/F4OlFT8w=
VBR-Info: md=iecc.com; mc=all; mv=dwl.spamhaus.org
Date: 23 Jan 2011 02:38:34 -0000
Message-ID: <20110123023834.19098.qmail@joyce.lan>
From: John Levine <johnl@iecc.com>
To: freebsd-questions@freebsd.org
Organization: 
X-Headerized: yes
Mime-Version: 1.0
Content-type: text/plain; charset=utf-8
Content-transfer-encoding: 7bit
Subject: Changing the MAC address on a LAN adapter
X-BeenThere: freebsd-questions@freebsd.org
X-Mailman-Version: 2.1.5
Precedence: list
List-Id: User questions <freebsd-questions.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-questions>, 
	<mailto:freebsd-questions-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-questions>
List-Post: <mailto:freebsd-questions@freebsd.org>
List-Help: <mailto:freebsd-questions-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-questions>, 
	<mailto:freebsd-questions-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Sun, 23 Jan 2011 03:05:17 -0000

My Lenovo laptop running 8.1 has two ordinary Intel network adapters,
a wired PRO/1000 with the em driver and a WiFi PRO/Wireless 5300 with
the iwn driver.  They work fine, but for either one if I use ifconfig
to change the MAC address, the adapter won't actually work until I
change the address back to the native one.  Typical symptoms are
endless DHCP queries with no response.

Is this a known problem?  As far as I know, it's supposed to work.

R's,
John

PS: If you were wondering, obnoxious airport wifi that cuts you off
after an hour and won't let you back on until the next day, keyed by
MAC address.

em0: <Intel(R) PRO/1000 Network Connection 7.0.5> port 0x1840-0x185f mem 0xf2600000-0xf261ffff,0xf2625000-0xf2625fff irq 20 at device 25.0 on pci0
em0: Using MSI interrupt

iwn0: <Intel(R) PRO/Wireless 5300> mem 0xf2500000-0xf2501fff irq 17 at device 0.0 on pci3
iwn0: MIMO 3T3R, MoW, address 00:21:6a:b5:18:48
iwn0: [ITHREAD]
iwn0: 11a rates: 6Mbps 9Mbps 12Mbps 18Mbps 24Mbps 36Mbps 48Mbps 54Mbps
iwn0: 11b rates: 1Mbps 2Mbps 5.5Mbps 11Mbps
iwn0: 11g rates: 1Mbps 2Mbps 5.5Mbps 11Mbps 6Mbps 9Mbps 12Mbps 18Mbps 24Mbps 36Mbps 48Mbps 54Mbps