lodin@plains.UUCP (Joe Schmo) (06/08/90)
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. Thanks alot... Reply to: Steve Lodin lodin%koiasvr01.uucp@ee.ecn.purdue.edu or lodin@koess.gm.hac.com
robinson@durham.med.unc.edu (Gerard A. Robinson) (06/10/90)
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
postel@VENERA.ISI.EDU (06/10/90)
Steve Lodin: AA:0:4:X:X:X = DEC - logical addresses for systems running decnet See RFC-1060 page 40. --jon.
stewart@xyplex.com (Bob Stewart) (06/11/90)
The Ethernet AA-00-04 indicates a DECnet node, with its Ethernet address "locally administered" to contain the DECnet node number. You'll find the fourth byte is a zero. The last two bytes are the DECnet node number, in, of course, little-endian form. The high order 6 bits of the last byte are the DECnet area. The rest of the bits are the DECnet node within that area. (This should be close, its from memory and looking at a sample of one DECNet node.) Bob ----------- Bob Stewart (rlstewart@eng.xyplex.com) Xyplex, Boxborough, Massachusetts (508) 264-9900
lodin@plains.UUCP (Joe Schmo) (06/12/90)
The culprit has been determined to be a Sun 4 running both TCP/IP and DECnet. The DECnet software for the Sun is Sunlink DNI. Only Intergraph machines pick up this address translation error, Suns and HPs don. We haven't determined whether its a Sun problem or Intergraph problem. No offense, but Intergraphs are weird when it comes to TCP/IP. Steven W. Lodin Advanced Instrumentation Engineering Delco Electronics Corp AT&T: (317) 451-8722 GM: 8-322-8722 Domain: lodin%koiasvr01.uucp@ee.ecn.purdue.edu or lodin@plains.nodak.edu or swlodin@koess.gm.hac.com UUCP: <backbone>!pur-ee!koiasvr01!lodin GM: LODIN, SW <KOESS::SWLODIN>