Date: Sat, 15 May 1999 12:28:26 +0930 From: Greg Lehey <grog@lemis.com> To: David Scheidt <dscheidt@enteract.com> Cc: Dan Nelson <dnelson@emsphone.com>, "Mark J. Taylor" <mtaylor@cybernet.com>, Daniel Eischen <eischen@vigrid.com>, freebsd-hackers@FreeBSD.ORG Subject: Re: ifconfig: changing mac address Message-ID: <19990515122826.O89091@freebie.lemis.com> In-Reply-To: <Pine.NEB.3.96.990514215106.75328A-100000@shell-1.enteract.com>; from David Scheidt on Fri, May 14, 1999 at 09:54:02PM -0500 References: <19990515121747.N89091@freebie.lemis.com> <Pine.NEB.3.96.990514215106.75328A-100000@shell-1.enteract.com>
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On Friday, 14 May 1999 at 21:54:02 -0500, David Scheidt wrote: > On Sat, 15 May 1999, Greg Lehey wrote: > > : > :If you have two different nets, why do you need the same Ethernet > :address? > : > > Transparent redundancy. With them both up on the same MAC address, if one > fails, you have no loss of connection, though you may drop some packets, of > course. Most of the time you get twice the bandwidth. > > David, who doesn't want to think about writing a driver for this. 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? 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. Greg -- See complete headers for address, home page and phone numbers finger grog@lemis.com for PGP public key To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message
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