From owner-freebsd-hackers Fri May 14 20:26:38 1999 Delivered-To: freebsd-hackers@freebsd.org Received: from dan.emsphone.com (dan.emsphone.com [199.67.51.101]) by hub.freebsd.org (Postfix) with ESMTP id 397FD14FB9 for ; Fri, 14 May 1999 20:26:36 -0700 (PDT) (envelope-from dan@dan.emsphone.com) Received: (from dan@localhost) by dan.emsphone.com (8.9.3/8.9.3) id WAA28917; Fri, 14 May 1999 22:26:19 -0500 (CDT) (envelope-from dan) Date: Fri, 14 May 1999 22:26:19 -0500 From: Dan Nelson To: Greg Lehey Cc: David Scheidt , "Mark J. Taylor" , Daniel Eischen , freebsd-hackers@FreeBSD.ORG Subject: Re: ifconfig: changing mac address Message-ID: <19990514222619.A28754@dan.emsphone.com> References: <19990515121747.N89091@freebie.lemis.com> <19990515122826.O89091@freebie.lemis.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii X-Mailer: Mutt 0.95.5i In-Reply-To: <19990515122826.O89091@freebie.lemis.com>; from "Greg Lehey" on Sat May 15 12:28:26 GMT 1999 X-OS: FreeBSD 4.0-CURRENT Sender: owner-freebsd-hackers@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.ORG In the last episode (May 15), Greg Lehey said: > OK, now maybe I'm missing something here. But an Ethernet address is > used to identify a board. Arp binds it to an IP address. An IP > address is bound to a network. So if you're on a different network, > you get a different IP address. Why do you need the same Ethernet > address? I don't think anyone mentioned anything about having the cards on two networks. In that case, you're right, having two cards with the same MAC address doesn't help one bit. > This is very different from having two boards on the same network, > both with the same Ethernet address. As I observed earlier, that does > make sense, but it's a hot standby situation. I can't see any point > in arranging for both of them to accept or send data. Doubles the bandwidth. Especially if you are talking to multiple machines (i.e. talk to two regular boxes at 100mbit/sec each), or have another box hooked up the same way (200mbit/sec to it). Since both cards in the server have the same MAC address, the client boxes don't know anything's unusual. -Dan To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message