From owner-freebsd-hackers@FreeBSD.ORG Mon Sep 6 11:13:00 2004 Return-Path: Delivered-To: freebsd-hackers@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id 3A5EF16A4CE for ; Mon, 6 Sep 2004 11:13:00 +0000 (GMT) Received: from mail.vanmaaren.org (maaren.demon.nl [82.161.132.220]) by mx1.FreeBSD.org (Postfix) with ESMTP id EC49543D41 for ; Mon, 6 Sep 2004 11:12:59 +0000 (GMT) (envelope-from paul@vanmaaren.org) Received: by mail.vanmaaren.org (Postfix, from userid 1000) id 56775F1EF; Mon, 6 Sep 2004 13:13:03 +0200 (CEST) Date: Mon, 6 Sep 2004 13:13:02 +0200 From: paul@vanmaaren.org To: freebsd-hackers@freebsd.org Message-ID: <20040906111302.GB14506@fw1-lan.vanmaaren.org> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline User-Agent: Mutt/1.4.2i Subject: MAC address change on 21040 "Tulip" Ethernet Adapter does not work X-BeenThere: freebsd-hackers@freebsd.org X-Mailman-Version: 2.1.1 Precedence: list List-Id: Technical Discussions relating to FreeBSD List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 06 Sep 2004 11:13:00 -0000 Hello, On a FreeBSD 4.9 machine I want to change the MAC address on a DecChip 21040 "Tulip" Ethernet Adapter. So I type the following: # ifconfig de0 down # ifconfig de0 link 00:00:00:12:34:56 # ifconfig de0 de0: flags=8802 mtu 1500 ether 00:00:00:12:34:56 media: Ethernet autoselect (10baseT/UTP) status: active # dhclient de0 In another window: # tcpdump -n -e -i de0 tcpdump: listening on de0 12:33:40.010093 8:0:2b:e6:d4:26 ff:ff:ff:ff:ff:ff 0800 342: 0.0.0.0.68 > 255.255.255.255.67: xid:0x8a4f8e11 ether 0:0:0:12:34:56 [|bootp] [tos 0x10] 12:33:40.019187 0:10:60:e7:6a:39 0:0:0:12:34:56 0800 342: 172.16.0.1.67 > 172.16.0.33.68: xid:0x8a4f8e11 Y:172.16.0.33 S:172.16.0.1 [|bootp] [tos 0x10] 12:33:40.105308 8:0:2b:e6:d4:26 ff:ff:ff:ff:ff:ff 0806 42: arp who-has 172.16.0.33 tell 172.16.0.33 >From the above is clear that the specified mac address is not used for putting things on the wire. It is used inside the packet though. Is this a known problem, and if so, can it be fixed? -- Regards, Paul