[Info-vax] Reject Cause=Invalid Message Format, Erroneous Transport PDU='386200BD00000005'H

[Dirk Munk]

Johnny Billquist wrote:
> On 2016-11-27 14:51, Supratim Sanyal wrote:
>>> You can not use NCP to get similar 'bogus' Phase IV information from
>>> another Phase V node.
>>
>> Thanks, that is indeed the case. I can run NCP commands from
>> RSX-11M-PLUS (NSP version = 4.0.0, Routing version = 2.0.0, Type =
>> Endnode IV) to both VAXen (running DECnet Plus/OSI) but cannot get NCP
>> to work between the two VAXen.
>
> To be correct:
> There is a subset of NCP available on Phase V nodes, which can be used
> to talk, in some limited form to Phase IV nodes.
> If you want to talk between Phase V nodes, you need to use whatever
> protocol they designed in Phase V, as it appears Phase V nodes do not
> have a NICE listener.

No, of course not. NICE is not designed to deal with OSI information. 
For OSI you need the Common Management Information Protocol (CMIP), 
which of course is not DECnet specific.

> Also, there is something slightly broken in Phase V with regards to
> Phase IV compatibility in other aspects as well, as can be seen by my
> reply of how a VMS and RSX box (both on phase IV) gives different errors
> when trying to talk NICE to a Phase V node.

No, talking NICE to a Phase V node makes no sense. A Phase V node can 
handle Phase IV traffic, it doesn't mean it can give Phase IV management 
information, since that information doesn't exist.

>
>> NCL does work between the two VAXen.
>
> That would be expected, yes.
>
>> I am trying to write a script to walk a mixed list of Phases IV and V
>> nodes and get status, running from one of the DECnet Plus/OSI/Phase V
>> nodes. This NCP for Phase IV and NCL for Phase V introduces a new twist.
>
> Could you please redesign that thing. I'm getting lots of logs about you
> trying to access machines I control, on which you do not have access.
>
>> Is there a way to find out from a Phase V node what protocol another
>> node is running (Phase IV or V) so that I can conditionally run NCP or
>> NCL from the script?
>
> I can't answer that one, as I avoid Phase V. :-)
>
>     Johnny
>