[HECnet] MIM?

[Johnny Billquist]

On 2018-10-23 15:51, Paul Koning wrote:
> 
> 
>> On Oct 23, 2018, at 3:54 AM, Johnny Eriksson <bygg at cafax.se> wrote:
>>
>> supratim sanyal wrote:
>>
>>> Johnny,
>>
>> The other Johnny will now give a short answer:
>>
>>> I am suddenly seeing this from IMPVAX. Not sure what to make of this
>>>
>>> $ dir mim::
>>> %%%%%%%%%%%  OPCOM  23-OCT-2018 04:15:10.77  %%%%%%%%%%%
>>> Message from user DECNET on IMPVAX
>>> DECnet event 4.18, adjacency down
>>>  From node 1.559 (IMPVAX), 23-OCT-2018 04:15:10.77
>>> Circuit TCP-0-0, Unexpected packet type, Adjacent node = 1.13 (MIM)
>>> Packet beginning = 010D040140020200002C010000000000
>>
>> The packet in question is an init packet, used to start up a link.
>>
>> If tcpdump knew about this, it would look somewhat like:
>>
>>   Init, 1.13 info 01 size 576 ver 2/0/0 timer 300
>>
>> Why MIM decided to restart the link is another question.
> 
> I would guess that is a Multinet link, right?  A conforming DECnet implementation would not send an init message without restarting the data link layer first, which would produce a "circuit down" event.  So the unexpected packet type is indeed a reasonable complaint for it to generate.

Yes, it's a Multinet link. In addition, it's one carried over TCP, so 
I'm a bit curious why you would get an init packet here. When the TCP 
connection was lost, the circuit should have gone down.
And you would not be able to get a new init packet before a new TCP 
connection was established.

But then again, I do not properly know how the Multinet implementation 
works internally, and I have been struggling from time to time to get it 
all working the right way. So I might also not be doing things in a 
fully matching manner to what Mutlinet does. If anyone have any 
knowledge of the internals of the Multinet implementation, I'd love to 
talk with them.

   Johnny

-- 
Johnny Billquist                  || "I'm on a bus
                                   ||  on a psychedelic trip
email: bqt at softjar.se             ||  Reading murder books
pdp is alive!                     ||  tryin' to stay hip" - B. Idol