Re: Link level Ethernet bridges (Modified)! does that mean joke?


gordan (mnetor!spectrix!yunexus!maccs!gordan@uunet.uu.net)
4 Mar 88 23:59:06 GMT


In article <3343@psuvax1.psu.edu> ehrlich@blitz.cs.psu.edu (Dan Ehrlich) writes:
-Once upon a time, in another job far, far, away I also encountered
-these mysterious aa:0:4:0:xx:xx addresses. Read on. Maybe someone
-can explain to me why DEC does what it does. :-)
-
-This mystery number is from a VAX running DECnet, either under VMS or
-Ultrix. [...] DEC in their infinite wisdom uses one of the maintenance
-functions in the DE[QU]NA to change the physical ethernet address from
-what is in the ROM to this magic number.

I wondered about those funny addresses myself when I found this in one
of my log files some time ago (it appeared to have snuck in as a
multicast packet). Then those lists of Ethernet packet types were
posted to this group, and 6003 was listed as "DEC/DNA Routing". Out of
sheer idle curiosity, anybody know what the protocol header fields are
for this packet?

aa 00 04 00 02 04 aa 00 04 00 01 04 60 03 1d 00 ............`...
81 26 00 00 aa 00 04 00 02 04 00 00 aa 00 04 00 .&..............
01 04 00 00 00 00 04 0a 18 0a 04 5d 86 00 00 00 ...........]....
00 00 00 00 00 00 00 00 00 00 00 00 ............

Ethernet -- aa 0 4 0 1 4 --> aa 0 4 0 2 4
Packet type (hex) : 6003



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