Date: Wed, 25 Sep 1996 14:24:31 -0700 (MST) From: Terry Lambert <terry@lambert.org> To: dubois@primate.wisc.edu (Paul DuBois) Cc: terry@lambert.org, current@FreeBSD.org, commercial@FreeBSD.org Subject: Re: Licensing Software Message-ID: <199609252124.OAA06806@phaeton.artisoft.com> In-Reply-To: <199609252044.PAA29154@night.primate.wisc.edu> from "Paul DuBois" at Sep 25, 96 03:44:56 pm
next in thread | previous in thread | raw e-mail | index | archive | help
> > de0: Ethernet address 00:80:48:e8:1b:b1 > > --------------------------***************** > > I have a device that changes this value (a GatorBox), and I believe > under some versions of Ultrix, they reprogrammed the ethernet > address as well (if I remember correctly, it was in conjunction > with something to do with DECnet). So although an address is > stamped on the card, the system reports a different one. (Don't > know why this is done, and it seems to make little sense as it > could cause a conflict?) LANalyzer (Excellan) ethernet cards can do this. Any router which can route DECNet can do this. Any Sun machine with a LANCE chipset can do this. Typically, it's done to allow the ethernet address to be set to the DECNet node address. Routers had to do it to "bridge" DECNet "segments", which were non-outable in olver versions of the DECNet protocol. NetBEUI has similar constraints. Yes, this value is spoofable. This value is, in fact, *more* spoofable than an IP address, since if I use the ifconfig interface to get the IP address, and I hack the interface to spoof the license manager, I break my networking because it will also spoof ifconfig (and netsta -i, etc.). Terry Lambert terry@lambert.org --- Any opinions in this posting are my own and not those of my present or previous employers.
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?199609252124.OAA06806>