Path: utzoo!attcan!uunet!mcvax!cernvax!achille
From: achille@cernvax.UUCP (achille petrilli)
Newsgroups: comp.sys.apollo
Subject: Re: How can I get the Ethernet No. of an Apollo
Message-ID: <1057@cernvax.UUCP>
Date: 22 Aug 89 21:28:29 GMT
References: <507@cadlab.cadlab.de> <349@simon.UUCP>
Reply-To: achille@cernvax.UUCP (achille petrilli)
Organization: CERN European Laboratory for Particle Physics, CH-1211 Geneva, Switzerland
Lines: 38

In article <349@simon.UUCP> root@simon.UUCP (Local Deity) writes:
>In article <507@cadlab.cadlab.de>, schmidt@cadlab.uucp (Michael Schmidt) writes:
>> We have 3com Ethernet boards in one of our Apollos. Can any kind
>> soul tell me, how I can get the Ethernet No. of one of these boards?
>> -- 
>
>On all of the 3com boards I have seen in the U.S. the Ethernet address is
>located on the board in two places.
>
>On the back of the board, there is a label in English that specifies the
>"NETWORK ADDRESS". This number has two parts; an assigned prefix that
>identifies the interface as being manufactured by 3com, and a unique part
>that identifies the specific board.  
>
>This second part of the address is also located on the small prom chip that
>encodes the address. On a 3c505 card the first part of the address is 02.60.8C
>and the prom is at U17. A 3c503 card will have a similar set of lables.
>
>If the system is up and running you can find out the Ethernet address by using
>the arp command available under UNIX. 

I seem to remember (it was some 2 years ago when I looked at it), that
Apollo's PC/AT Eth boards are NOT the ones you can buy in a shop, due
to a different ROM Apollo ships with them.

Also, apparently Apollo overwrites the standard (3Com) eth address
with Apollo's own address, that is 8:0:1e:??:??:??, where the last
??:??:?? stands for the hexadecimal nodeid of the machine. So the
same eth board will have different h/w addresses depending on which
node it is plugged in.

I was checking that when first installed domain on eth and we wanted to
know how much traffic was generated in, otherwise idle, conditions.
Obviously it took a couple of hours to realize that the board address
was overwritten :-)

Achille Petrilli
Cray and PWS operation