Path: utzoo!attcan!uunet!know!sdd.hp.com!ucsd!ucbvax!emrcan.BITNET!fillmore
From: fillmore@emrcan.BITNET
Newsgroups: comp.protocols.tcp-ip
Subject: Reply to Re: Ethernet Address Uniqueness...
Message-ID: <5A0A090C1F1A031C-MTAEMR1*fillmore@emrcan>
Date: 9 Oct 90 18:15:17 GMT
Sender: daemon@ucbvax.BERKELEY.EDU
Organization: The Internet
Lines: 14

In my recent message about DECNET Ethernet address non-uniqueness I should have
mentioned that my site works in a mixed DECNET - TCP/IP environment (plus
Appletalk, etc.).  Problems arise in VAXes which run both DECNET and TCP/IP
on the same Ethernet interface - the Ethernet address used in ARP responses
depends on whether DECNET was started before or after TCP/IP, because DECNET
changes the Ethernet address in the interface hardware (in RAM memory).
If the TCP/IP software uses the modified DECNET Ethernet address then there
might be address duplication because IP addresses are connection oriented,
not node oriented.
________________________
Bob Fillmore, Systems Software & Communications     BITNET:  FILLMORE@EMRCAN
  Computer Services Centre,                         BIX:     bfillmore
  Energy, Mines, & Resources Canada                 Voice:   (613) 992-2832
  588 Booth St., Ottawa, Ontario, Canada  K1A 0E4   FAX:     (613) 996-2953