Date: Mon, 27 Aug 2001 10:35:49 -0700 From: "Chad R. Larson" <chad@DCFinc.com> To: Kevin Oberman <oberman@es.net> Cc: chad@DCFinc.com, reader@newsguy.com, freebsd-mobile@FreeBSD.ORG Subject: Re: Frustrating network problem - need diagnotic help Message-ID: <20010827103549.B475@freeway.dcfinc.com> In-Reply-To: <200108271707.f7RH73R23446@ptavv.es.net>; from oberman@es.net on Mon, Aug 27, 2001 at 10:07:03AM -0700 References: <200108271633.JAA18022@freebie.dcfinc.com> <200108271707.f7RH73R23446@ptavv.es.net>
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On Mon, Aug 27, 2001 at 10:07:03AM -0700, Kevin Oberman wrote: > I'm afraid not. I do have my 802.3 handy and the source address field > is not interpreted at all. The I/G bit (individual/group) bit is > ALWAYS interpreted in a destination address, so setting the "locally > admin" bit does not over-ride this functionality. The import is that > many devices (including switches) make forwarding decisions based on > the setting of this bit. We did a bunch of multicasting stuff at my prior job, where we were building high-availability clusters of Pyramids. At the time, the O/S didn't support IP aliases on the interfaces, so we set up locally administered multicast addresses for the machines so clients could find their application even if it had migrated within the cluster. We had to put static ARP entries in the Cisco routers, as they were pretty snooty about dealing with multicast at all. > In any case, a hardware MAC address that has the group address bit set > is clearly broken. Unless it is a deliberate multicast. In this case, not likely. But not intrinsically broken. > R. Kevin Oberman, Network Engineer > Energy Sciences Network (ESnet) > Ernest O. Lawrence Berkeley National Laboratory (Berkeley Lab) > E-mail: oberman@es.net Phone: +1 510 486-8634 -crl -- Chad R. Larson (CRL15) 602-953-1392 Brother, can you paradigm? chad@dcfinc.com chad@larsons.org larson1@home.com DCF, Inc. - 14623 North 49th Place, Scottsdale, Arizona 85254-2207 To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-mobile" in the body of the message
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