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- From: roy@mchip00.med.nyu.edu (Roy Smith)
- Newsgroups: comp.sys.mac.programmer
- Subject: Re: Uniquely identifying a Mac? How?
- Date: 16 Dec 1992 02:16:56 GMT
- Organization: New York University, School of Medicine
- Lines: 46
- Message-ID: <1gm3ioINN9uh@calvin.NYU.EDU>
- References: <9235010.4295@mulga.cs.mu.OZ.AU> <1992Dec15.121756.23075@kth.se>
- NNTP-Posting-Host: mchip00.med.nyu.edu
-
- d88-jwa@dront.nada.kth.se (Jon Wtte) writes:
- >If you run MacTCP, each mac will have/get its own IP address;
- >likewise, EtherNet cards have a 6-byte EtherNet address that's
- >unique in the world.
-
- Well, no, that's not quite true. If you run MacTCP, you basically
- have 3 choices:
-
- 1) You're configured for "Manual" mode, in which case the only
- reason you have an unique IP address is because somebody (manually, hence
- the name) configured it in. That somebody could just as easily change it,
- either by accident, or on purpose.
-
- 2) You're on a LocalTalk segment behind a FastPath (or similar box
- with KIP-like dynamic address allocation) and you're configured for "Server"
- moded. In that case, you've got an IP address which is currently unique,
- but each time you reboot, you (potentially) get a different one. Hardly
- useful for identifying a machine on the network.
-
- 3) You're on Ethernet and configured for "Server" mode, in which
- case a bootp server gave you your IP address, based on a 1-to-1 mapping from
- your ethernet address. I don't know about token ring, but presumably the
- same thing can happen with TokenTalk.
-
- Then, of course, there's "Dynamic" mode in MacTCP, but I havn't the
- foggiest idea what it is. :-)
-
- Unfortunately, as far as I can tell, unless your Mac has an ethernet
- (or, presumably, token ring) port, there is no built-in unique way to
- identify the machine. I personally think it was a major mistake for Apple
- to not have put some sort of machine-readable serial number in each machine.
- Actually, there is a machine-readable serial number *on* each machine; it's
- the bar-code label on the bottom/back/where-ever. Unfortunately, since most
- Macs don't come with bar-code readers, they have no way of finding out their
- own serial number. Sort of like walking around with a sign painted on your
- forehead that everybody but yourself can read! Obviously, it would have
- added something to the manufacturing costs, but slapping those unique
- bar-code labels must cost something too; I would have been happy to give up
- the unique bar-code on my keyboard and mouse to have a serial number burned
- into an eprom on board.
-
- --
- Roy Smith <roy@nyu.edu>
- Hippocrates Project, Department of Microbiology, Coles 202
- NYU School of Medicine, 550 First Avenue, New York, NY 10016
- "This never happened to Bart Simpson."
-