[Simh] VAX/VMS 6.2 DECnet turned off, still resetting MAC address

[Mark Pizzolato - Info Comm]

Hi Bill,

My responses inline in GREEN.

From: Bill Deegan [mailto:bill at baddogconsulting.com]
Sent: Tuesday, October 20, 2015 2:54 PM
To: Mark Pizzolato - Info Comm <Mark at infocomm.com>
Cc: simh at trailing-edge.com
Subject: Re: [Simh] VAX/VMS 6.2 DECnet turned off, still resetting MAC address

Mark,
See responses inline.

On Tue, Oct 20, 2015 at 2:39 PM, Mark Pizzolato - Info Comm <Mark at infocomm.com<mailto:Mark at infocomm.com>> wrote:
Hi Bill,

I’m still looking for details on your network vision/requirements:

Do you expect communicate between the host system and the simulated VMS environment?  If so, how were you thinking you’d achieve this?

No need.

You do have a unique IP address for use by the VMS system, right?

Historical questions relating to some possible solutions to achieve the, as yet not completely specified, network goals:

Have you previously had LAT enabled on the original VMS system?

Yes. But no longer needed. LAT startup has been commented out.


Was this VMS system ever part of a VMS Cluster environment?

Yes.  But no longer needed.

You should also do the following:
$ RUN SYS$SYSTEM:SYSGEN
SYSGEN> SET VAXCLUSTER 0
SYSGEN> SET SCSSYSTEMID 0
SYSGEN> WRITE CURRENT
Change the same values in SYS$SYSTEM:MODPARAMS.DAT so that you won’t get surprised by some future AUTOGEN you might do.
Reboot your system.
-Bill

- Mark

From: Bill Deegan [mailto:bill at baddogconsulting.com<mailto:bill at baddogconsulting.com>]
Sent: Tuesday, October 20, 2015 2:21 PM
To: Mark Pizzolato - Info Comm <Mark at infocomm.com<mailto:Mark at infocomm.com>>
Cc: simh at trailing-edge.com<mailto:simh at trailing-edge.com>
Subject: Re: [Simh] VAX/VMS 6.2 DECnet turned off, still resetting MAC address

Mark,
The system is running multinet, so accessing the system vi TCP/IP and telnet will be sufficient for this application.
Not cluster not decnet needed.
-Bill

On Tue, Oct 20, 2015 at 1:55 PM, Mark Pizzolato - Info Comm <Mark at infocomm.com<mailto:Mark at infocomm.com>> wrote:
Hi Bill,

You want VMS to not try and change the MAC address.

On Tuesday, October 20, 2015 at 1:31 PM, Bill Deegan wrote:
> I'm migrating a VMS 6.2 system from real hardware to simh VAX.
> We're running on EC2 so DECnet's a no go.

So, exactly how do you plan/want to access the simulated VAX?

What do you envision the network to look like?

> We've disabled the DECnet startup on the system, but when I turn on tracing I see:
> DBG(42740138541)+> XQ ETH: writing  dst: 02:41:0C:98:92:09  src: AA:00:04:00:20:10  proto: 0x0800  len: 98  crc: B5981F43
>
> Is there a way to enable the debugging before booting up the VAX?

The same debugging commands that enabled the above XQ debug output can certainly be put in the vax configuration file.

I'm not sure how that will help anything.

> Barring that is there a way to prevent simh catching the "setup packet" and changing the SRC MAC address?

Something in VMS is changing the MAC address on the simulated interface by issuing the appropriate I/O operations to do this.  It may be DECnet or it may also be other networking things on the system.

Before we dig into the details of that, answering the above questions about how you envision the network to look will be more helpful.

- Mark


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