At 02:20 AM 4/22/00 , Johnny Billquist wrote:
>On Sat, 22 Apr 2000, der Mouse wrote:
>
> > I can't help with much of it, but I can clear up this much.
> > 
> > > MOP DL 8:0:2b:19:8f:4e   > ab:0:0:1:0:0      len   24 code 08 RPR
> > 
> > > The ethernet address shown is the DECServer, I assume ab:0:0:1:0:0 is
> > > a broadcast address?
> > 
> > I *think* there's only one broadcast Ethernet address,
> > ff:ff:ff:ff:ff:ff.  ab:0:0:1:0:0 is a multicast address, used for just
> > this sort of MOP booting.
>
>Well, no. Multicast is an IP term. In ethernet, all addresses with a "1"
>in the low bit of the first byte is a broadcast, since that is the
>broadcast bit.

Bzzzt.  Wrong.  Multicast is a Ethernet term.  Ethernet controllers have
*multicast* filters.  The broadcast address is a special multicast address.
MOP uses multicast addresses (MOP Dump/Load uses AB-00-00-01-00-00 and 
MOP Remote Console uses AB-00-00-02-00-00).

>It is, however, up to every machine to decide which broadcast you want to
>receive (inlcuing the all-ones).

Again you have the sense of multicast and broadcast reversed.
-- 
Matt Thomas               Internet:   matt@3am-software.com
3am Software Foundry      WWW URL:    http://www.3am-software.com/bio/matt/
Cupertino, CA             Disclaimer: I avow all knowledge of this message