home *** CD-ROM | disk | FTP | other *** search
- Path: sparky!uunet!munnari.oz.au!yoyo.aarnet.edu.au!dstos3.dsto.gov.au!ardu.dsto.gov.au!css
- From: css@ardu.dsto.gov.au
- Newsgroups: vmsnet.networks.tcp-ip.multinet
- Subject: Re: hardware address?
- Message-ID: <1992Jul23.135118.1@ardu.dsto.gov.au>
- Date: 23 Jul 92 04:21:18 GMT
- References: <2020038B16JUL92220529@TGV.COM>
- Organization: RAAF ARDU
- Lines: 43
- Nntp-Posting-Host: rental.dsto.gov.au
-
- In article <2020038B16JUL92220529@TGV.COM>, adelman@TGV.COM writes:
- >> Node Volatile Characteristics as of 16-JUL-1992 11:38:35
- >
- >> Remote node = 43.755 (ROCK09)
- >
- >> Hardware address = 08-00-2B-0F-5E-73
- >> Tertiary loader = SYS$SYSTEM:TERTIARY_VMB.EXE
- >> Load Assist Agent = SYS$SHARE:NISCS_LAA.EXE
- >> Load Assist Parameter = DISK$VAXVMSRL5:<SYS10.>
- >
- >
- >> What is that "Hardware address"? How is it related to the ethernet
- >> physical address which is AA-00-04-00-F3-AE for this node? Somebody
- >> please enlightens me about this. Thanx in advance.
- >
- > Every ethernet controller made has an unique ethernet address
- > located in a PROM on the board; your address is 08-00-2B-0F-5E-73 (DEC
- > hardware addresses start with 08-00-2B or AA-00-03.). When DECnet
- > starts it changed the address used by the card to a function of your
- > DECnet address, starting with AA-00-04-00.
- >
- > For all practical purposes, the address of your machine is
- > AA-00-04-00-F3-AE. If you boot across the Ethernet, it will use the
- > address 08-00-2B-0F-5E-73 for a short period of time until VMS gets
- > loaded and it changed address.
- >
- > Ken
- >
- Just to add some more info (for those who like a bit of calculating), the DEC
- physical address is calculated from the DECNET node and area number, in this
- case 43.755 (ROCK09) is area 43, node 755. To calculate:-
- area * 1024 + node =
- 43 * 1024 + 755 = 44,787 (a decimal number)
- convert 44,787 to hexadecimal = AEF3
- reverse pairs of digits = F3 AE
- Append to the address AA-00-04-00 to give the address used by DECnet:
- AA-00-04-00-F3-AE
- Ain't life wonderful!!!!!
- All this is spelled out in the DEC VMS Networking manual
- (para 3.3.4.2 in my old VMS 5.0 edition)
- Hope this takes out the mystery of where the number comes from.
-
- John Hall, jlh@ardu.dsto.gov.au
-