Testing and Verifying DECNET setup.

November 19, 2010 at 11:00:13
Specs: OpenVMS 7.2, MicroVax 3800
I have recently been assigned to port over all Vax/VMS applications to a Linux system. The last time that the company had an actual VMS system admin was 10 years ago. They have been winging it since then. The last time I was a VMS admin was 20 years ago. Anyway, we have a MicroVax 3800 with a network (BNC/AUI) port. I have purchased a BNC cable with the proper terminators and T-connectors and attached this cable to an Ethernet Hub/Repeater. I have run through the Networking manuals that I found on the HP site, and have run the netconfig.com script and all the NCP commands that I can find. Software wise, I believe that DECNET is running as it should. We have two Linux servers running Decnet/Linux that will communicate with each other using dndir, dneigh, dncopy commands. I can "sethost xxxx" from one to the other successfully. Where my problem lies is that neither can see or connect to the MicroVax, nor can the MicroVax see or connect to either Linux server. Is there someone who knows the networking side of DEC systems that could give me some assistance? I'm not 100% confident that we can connect a Vax directly to a hub and make it work. I'm thinking in the back of my mind we need something like an interconnect device, but I'm not sure. Any help would be greatly appreciated.

Kind Regards,
Jim Wallace

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November 19, 2010 at 11:12:59
It has been over 10 years since I worked with decnet. I am moving this to the Open VMS forum in the hopes of connecting you with someone still working with decnet.

Answers are only as good as the information you provide.
How to properly post a question: http://tinyurl.com/2fsqqmu

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November 20, 2010 at 07:48:05
I'm using DECnet, but it is Phase V on Alphas, which has a different setup and command interface, so I can't only be vague in the commands to diagnose.

First the basic Ethernet connection verification:
Of course one can connect the VAX directly to a hub via BNC. Are You sure the BNC connection is used ? There should be a switch and/or indicator showing AUI or BNC is selected.
Does the hub or switch indicate "link up" and activity?

If the hardware connection looks o.k., VMS DECnet software:
First enable the operator console on Your VMS terminal (-window), or better on a separate terminal window:
to see any system messages.
Check if DECnet is started and active on VMS:
NCP SHOW EXECUTOR is it in state ON ?
I assume the circuit name is ESA-0 (substitute for the correct one ...).
(or SHOW KNOWN CIRCUITS COUNTERS , don't know which is correct, use HELP SHOW from the NCP prompt).
Do counters show activity or only error counts ?

Is the address setup on both sides (Linux and VMS) agreeing ?
Since You (most probably) have no DECnet router in between, are all nodes in the same area ? The area is the first part of the address a.n .
If the Linux nodes are in 1.x then the VMS system must have an address 1.x as well.

Is the (non-)reachability symmetric ? What is the result of SET HOST linuxnode ?

Another point is to look at the Ethernet counters:

That's all I have to offer for the moment.
If there is no solution, maybe asking the question on the HP ITRC VMS forum (see link in my sig below) brings in somebody with a similar VAX and VMS version.

Good luck.

Joseph Huber, http://www.huber-joseph.de

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