[Simh] Simh Digest, Vol 151, Issue 7

[David Coolbear]

I tried running on the new version of simh - git commit id: 25b9fc22, but
there was no noticeable difference.

I mentioned two simulators for completeness of discussion but that's not
typical. Typically I only run one at a time. When I do run two, I use a
unique MAC address for the VAX simulator so that I can run both at the same
time without having duplicate MACs.

For essentially all my testing I've been focusing on the PDP11 simulator
and the VAX simulator isn't running. The ping test shown in my initial
email is from the simulated PDP11 (192.168.1.4/24) running on the Linux
host (192.168.1.2/24) to the cable router (192.168.1.1/24). The cable
router is the default route for both the simulated PDP11 and the Linux
host. As I mentioned before, the PDP11 is attached to a dedicated NIC and
that NIC is up but doesn't have an IP address assigned.

My instinct is that the problem is with the Linux host and not the
simulator since this was working at one time (before I upgraded the Linux
OS). I'm wondering if I need to mess with the routing table or arp table in
the Linux host.

Message: 2
Date: Tue, 23 Aug 2016 19:16:02 +0200
From: Johnny Billquist <bqt at softjar.se> <bqt at softjar.se>
To: simh at trailing-edge.com
Subject: Re: [Simh] Packet Loss
Message-ID: <3e60a2ea-f7c7-49ca-1e60-d8350cf47fde at softjar.se>
<3e60a2ea-f7c7-49ca-1e60-d8350cf47fde at softjar.se>
Content-Type: text/plain; charset=utf-8; format=flowed

"Between simulators" ...?

So you are running two simulators, and if I understand all of your text
correctly, you have the same MAC address on both of them?

In that case, I would indeed expect for each one, to on average only get
a 50% success rate on ping packets.

	Johnny


------------------------------

Message: 3
Date: Tue, 23 Aug 2016 12:28:44 -0700
From: Mark Pizzolato <Mark at infocomm.com> <Mark at infocomm.com>
To: David Coolbear <david at thecoolbears.org> <david at thecoolbears.org>,
"simh at trailing-edge.com" <simh at trailing-edge.com>
	<simh at trailing-edge.com> <simh at trailing-edge.com>
Subject: Re: [Simh] Packet Loss
Message-ID:
	<03006E3FC39B5A48AB9DBCCC101090A82E030F1B73 at REDROOF2.alohasunset.com>
<03006E3FC39B5A48AB9DBCCC101090A82E030F1B73 at REDROOF2.alohasunset.com>
Content-Type: text/plain; charset="utf-8"

Hi David,

First I would suggest that you run the latest code which has
significantly improved networking.
The latest is available from https://github.com/simh/simh/archive/master.zip

It is not clear from the below description, but from what Johnny read
‘in between
the lines’  you have both the VAX and PDP11 simulators configured with the same
MAC address.  This would indeed be an error on your part (and the latest code
would tell you that).

Meanwhile, once unique MAC addresses are configured for each simulator (which
would happen automatically if you didn’t explicitly have a “SET XQ MAC=…”
command using the latest code), then your dedicated to simh NIC model should
work well.

If it doesn’t, please create an issue at https://github.com/simh/simh/issues and
we can explore the details further.

Good Luck.


-          Mark
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