From owner-freebsd-hackers Sat Feb 9 5:54:28 2002 Delivered-To: freebsd-hackers@freebsd.org Received: from freebie.xs4all.nl (freebie.xs4all.nl [213.84.32.253]) by hub.freebsd.org (Postfix) with ESMTP id 17E5737B402 for ; Sat, 9 Feb 2002 05:54:24 -0800 (PST) Received: (from wkb@localhost) by freebie.xs4all.nl (8.11.6/8.11.6) id g19DsEH00386; Sat, 9 Feb 2002 14:54:14 +0100 (CET) (envelope-from wkb) Date: Sat, 9 Feb 2002 14:54:14 +0100 From: Wilko Bulte To: Terry Lambert Cc: "Vladislav V. Anikiev" , Brian Reichert , freebsd-hackers@FreeBSD.ORG Subject: Re: MAC address Message-ID: <20020209145414.A372@freebie.xs4all.nl> References: <200202090052.DAA62563@neo.spbnit.ru> <3C649564.F51D18BE@mindspring.com> <20020209133738.A31278@freebie.xs4all.nl> <3C65235E.F46A40B1@mindspring.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline User-Agent: Mutt/1.2.5i In-Reply-To: <3C65235E.F46A40B1@mindspring.com>; from tlambert2@mindspring.com on Sat, Feb 09, 2002 at 05:25:50AM -0800 X-OS: FreeBSD 4.5-STABLE X-PGP: finger wilko@freebsd.org Sender: owner-freebsd-hackers@FreeBSD.ORG Precedence: bulk List-ID: List-Archive: (Web Archive) List-Help: (List Instructions) List-Subscribe: List-Unsubscribe: X-Loop: FreeBSD.ORG On Sat, Feb 09, 2002 at 05:25:50AM -0800, Terry Lambert wrote: > Wilko Bulte wrote: > > > Some NICs allow you to change the default MAC address by > > > reflashing the BIOS in them. There are tools to do this > > > in software. > > > > Or just reprogram it for runtime use only. DECnet comes to mind. > > No flashing needed there. > > Yes. The LANCE based DEQNA's from the MicroVAX II were > really strange in supporting that. It wasn't until I > realized that the MAC address was the DEC assigned > address block prefix plus an internal prefix, plus the > DECNet node number, that I realized why I could not > talk to DECNet with my raw EtherLink I drivers, even > though the packets were formatted correctly. 8-). Cool huh? We once had that when we wanted to isolate a part of the network using a programmable bridge. The network folks programmed it for us, then a colleague put DECnet on it. And nuked another DECnet node on the network because the bridge happily forwarded the new MAC-address' packets. The fact that we picked an arbitrary DECnet address which proved a main node on the DEC internal Easynet left us pretty impopulair for a considerable time ;-) -- | / o / /_ _ wilko@FreeBSD.org |/|/ / / /( (_) Bulte Arnhem, the Netherlands To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message