Xref: utzoo comp.protocols.tcp-ip:11648 comp.dcom.lans:5151
Path: utzoo!attcan!uunet!samsung!uakari.primate.wisc.edu!uflorida!haven!uvaarpa!mcnc!ecsgate!uncmed!durham!robinson
From: robinson@durham.med.unc.edu (Gerard A. Robinson)
Newsgroups: comp.protocols.tcp-ip,comp.dcom.lans
Subject: Re: Duplicate Internet address on same network
Keywords: internet ethernet
Message-ID: <311@uncmed.med.unc.edu>
Date: 9 Jun 90 21:01:23 GMT
References: <4988@plains.UUCP>
Sender: news@uncmed.med.unc.edu
Reply-To: robinson@uncmed.med.unc.edu (Gerard A. Robinson)
Followup-To: comp.protocols.tcp-ip
Organization: UNC-CH School of Medicine, Office of Information Systems
Lines: 14

In article <4988@plains.UUCP> lodin@plains.UUCP (Steve Lodin) writes:
>
>I have two machines on my network using the same Internet address, and without
>network analysis tools, I am having trouble identifying the culprit.  Could
>somebody please tell me which manufacturer uses the Ethernet address
>AA:0:4:X:X:X.

That's the format of a DEC ethernet address after DECnet is done with it.
The X:X:X is typically a 0 followed by the 16-bit combination of the area
and node number 6bits of area and 10bits of node, little-endian.  DECnet
overrides the default ethernet address on the board with this result.  An
example for host 42.8 is AA:0:4:0:8:A8.

Gerard Robinson