On 7/1/05, William Chops Westfield wrote: > On Jun 30, 2005, at 6:18 AM, Charles Craft wrote: > > > Arguing ethernet bits and bytes with the guy from Cisco. No no no. > > Heh. To be fair, it's no longer obvious that I'm from cisco, since > I moved piclist reception to mac.com... > > The "locally administered address" is part of the 802.1 physical > address specification. I don't think IEEE specs are freely available > online, but there's a good explanation in the wikipedia of all places: > http://en.wikipedia.org/wiki/MAC_address > > The local addresses weren't used much on ethernet; in fact I don't think > they were in the original ethernet specification; it was more along the > lines of something added when there started to be a bunch of 802.x > specs, > and you needed to do correct transparent or translational bridging > between > them. Local addresses were more common on token ring. I don't recall > whether DECNet originally aimed at using a locally defined range of > addresses, or whether they just turned that into a happy coincidence > when > IEEE took over ethernet from DEC/Xerox/3com... > > I also can't find a way to request a "locally assigned" OUI assignment > from IEEE, although I'm not sure what that means; I didn't see a form > for a multicast range either. > > BillW Guys: The mac address is necessary, the IP is mapped to the mac address of the device in the routing table of the immediate routing device. From there I believe the mac gets dropped, it just becomes an IP. But without a mac address, you can't get mapped. For the one out's, I'm for grabbing an old 10baseT NIC and glombing it's Mac. Now . . . where can I get one of these devices? And, has anyone seen any sample routines for it yet? -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist