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

[Mark Pizzolato - Info Comm]

On Tuesday, October 20, 2015 at 2:56 PM, Johnny Billquist wrote:
> Bill - just a quick check. Does it really matter that the MAC address
> gets set? Do you have some other device that also sets the same MAC
> address? Otherwise the MAC address don't really matter. It's just 48
> bits that needs to be unique.

I agree, that in general it should not matter one way or another.  However I suspect that the EC2 environment he's running under has specific knowledge of the MAC address they've assigned him and so it probably does matter or he'd already have gotten further along.

> 	Johnny
> 
> On 2015-10-20 23:53, Bill Deegan wrote:
> > 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.
> >
> >     ____
> >
> >     __ __
> >
> >     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.
> >
> >
> > -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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> > Simh at trailing-edge.com
> > http://mailman.trailing-edge.com/mailman/listinfo/simh
> >
> 
> 
> --
> Johnny Billquist                  || "I'm on a bus
>                                    ||  on a psychedelic trip
> email: bqt at softjar.se             ||  Reading murder books
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