[HECnet] LQA system ID message

[Dave McGuire]

On 02/15/2013 08:53 PM, Johnny Billquist wrote:
I was watching the MOP Console system ID messages from DECnet/E on
simh, with an emulated LQA.   Noticed something odd: the source address
was broadcast.   That's not valid, of course.   The question is why that
happened.

The answer is that the emulation uses the address in slot 0 of the
address filter as the source address.   The hardware doesn't care what
order the addresses go in as far as filtering is concerned; DECnet/E
puts broadcast in slot 0 and the physical address in slot 1, followed
by any multicast addresses.

Is the SIMH behavior also what a real LQA does?   That would be an
interesting DECnet/E bug if so...   Or does a real LQA just use the
physical address, as a UNA would?

Hi, Paul. Sorry for not responding sooner. Busy, as usual. However, I
did mark this for some later investigation. However, I now realize that
it's not trivial for me to test, as it would appear a RSTS/E system
would help. :-)
I honestly don't know how a real LQA do. Maybe John Wilson knows more,
since he have been digging into these kind of questions way more than
most people I know...

Or else if you have some realistic suggestion on how I would test this
on my machine, as I do have a 11/93 with a real LQA here (although an
LQA plus).

  I can provide access to my RSTS/E machine with a DELQA if that would
be helpful.

                              -Dave

-- 
Dave McGuire, AK4HZ
New Kensington, PA