Date: Fri, 14 May 1999 22:26:19 -0500 From: Dan Nelson <dnelson@emsphone.com> To: Greg Lehey <grog@lemis.com> Cc: David Scheidt <dscheidt@enteract.com>, "Mark J. Taylor" <mtaylor@cybernet.com>, Daniel Eischen <eischen@vigrid.com>, freebsd-hackers@FreeBSD.ORG Subject: Re: ifconfig: changing mac address Message-ID: <19990514222619.A28754@dan.emsphone.com> In-Reply-To: <19990515122826.O89091@freebie.lemis.com>; from "Greg Lehey" on Sat May 15 12:28:26 GMT 1999 References: <19990515121747.N89091@freebie.lemis.com> <Pine.NEB.3.96.990514215106.75328A-100000@shell-1.enteract.com> <19990515122826.O89091@freebie.lemis.com>
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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
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