funsec mailing list archives
Re: No Place Left to Hide on Tomorrow's Net?
From: Blue Boar <BlueBoar () thievco com>
Date: Sun, 19 Mar 2006 23:24:40 -0800
der Mouse wrote:
It's been a while, so I may have this wrong (and it may depend on which DECnet Phase we're talking about), but as I recall, it was actually that DECnet tried to reach a machine at a MAC address derived directly from its DECnet address (the DECnet node number got a fixed set of bits prepended to it). I don't remember exact details, but it was something like node 14:711 (binary 001110 1011000111, hex 3ac7 after regrouping) being assumed to be at 0a:00:00:01:3a:c7, the 0a:00:00:01 part being constant and part of the spec for that phase of DECnet. Yes, this put them in a part of the MAC address space assigned to DEC, but it didn't depend on having a DEC card, just on having one whose MAC address could be set by software (these days that's all of them, but back in the earlier days it wasn't). Of course, it also required software that knew how to set the MAC, but that was just part of having a DECnet stack that could handle that interface.
The Wikipedia entry is decent: http://en.wikipedia.org/wiki/DECnet Look under "Phase IV"."The Ethernet implementation was unusual in that the software changed the physical address of the Ethernet interface on the network to AA-00-04-00-xx-yy where xx-yy reflected the DECnet network address of the host. This allowed router-less LAN operation because the LAN address could be deduced from the DECnet address."
I disagree with the "router-less" bit. Maybe ARP-equivalent-less. BB (Who did too much DECNet in the early 90s.) _______________________________________________ Fun and Misc security discussion for OT posts. https://linuxbox.org/cgi-bin/mailman/listinfo/funsec Note: funsec is a public and open mailing list.
Current thread:
- No Place Left to Hide on Tomorrow's Net? Fergie (Mar 19)
- RE: No Place Left to Hide on Tomorrow's Net? Richard M. Smith (Mar 19)
- Re: No Place Left to Hide on Tomorrow's Net? der Mouse (Mar 19)
- Re: No Place Left to Hide on Tomorrow's Net? Jeff Rosowski (Mar 20)
- Re: No Place Left to Hide on Tomorrow's Net? Eduardo Tongson (Mar 20)
- <Possible follow-ups>
- RE: No Place Left to Hide on Tomorrow's Net? Alex Eckelberry (Mar 19)
- RE: No Place Left to Hide on Tomorrow's Net? Richard M. Smith (Mar 19)
- RE: No Place Left to Hide on Tomorrow's Net? Nick FitzGerald (Mar 19)
- Re: No Place Left to Hide on Tomorrow's Net? der Mouse (Mar 19)
- Re: No Place Left to Hide on Tomorrow's Net? Blue Boar (Mar 19)
- Re: No Place Left to Hide on Tomorrow's Net? Nick FitzGerald (Mar 20)
- Re: No Place Left to Hide on Tomorrow's Net? der Mouse (Mar 20)
- Re: No Place Left to Hide on Tomorrow's Net? Blue Boar (Mar 20)
- Re: No Place Left to Hide on Tomorrow's Net? Nick FitzGerald (Mar 20)
- Re: No Place Left to Hide on Tomorrow's Net? Jeff Rosowski (Mar 20)
- Re: No Place Left to Hide on Tomorrow's Net? Valdis . Kletnieks (Mar 20)
- Re: No Place Left to Hide on Tomorrow's Net? der Mouse (Mar 20)
- RE: No Place Left to Hide on Tomorrow's Net? Richard M. Smith (Mar 19)
- RE: No Place Left to Hide on Tomorrow's Net? Richard M. Smith (Mar 19)
- Re: No Place Left to Hide on Tomorrow's Net? Nick FitzGerald (Mar 20)
- Re: No Place Left to Hide on Tomorrow's Net? Valdis . Kletnieks (Mar 19)
- RE: No Place Left to Hide on Tomorrow's Net? Richard M. Smith (Mar 20)