[Simh] Simh Digest, Vol 151, Issue 7

[Johnny Billquist]

Since Linux isn't using/managing the interface, the Linux routing table 
or ARP cache is not involved.

You could try running tcpdump on the interface to see if all packets 
come in, and whether packets go out.

	Johnny

On 2016-08-24 23:16, David Coolbear wrote:
> 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
> <http://192.168.1.4/24>) running on the Linux host (192.168.1.2/24
> <http://192.168.1.2/24>) to the cable router (192.168.1.1/24
> <http://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> <mailto:bqt at softjar.se>
>> To: simh at trailing-edge.com <mailto:simh at trailing-edge.com>
>> Subject: Re: [Simh] Packet Loss
>> Message-ID: <3e60a2ea-f7c7-49ca-1e60-d8350cf47fde at softjar.se>
>> <mailto: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> <mailto:Mark at infocomm.com>
>> To: David Coolbear <david at thecoolbears.org> <mailto:david at thecoolbears.org>, "simh at trailing-edge.com" <mailto:simh at trailing-edge.com>
>> 	<simh at trailing-edge.com> <mailto:simh at trailing-edge.com>
>> Subject: Re: [Simh] Packet Loss
>> Message-ID:
>> 	<03006E3FC39B5A48AB9DBCCC101090A82E030F1B73 at REDROOF2.alohasunset.com>
>> <mailto: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
>> <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 <https://github.com/simh/simh/issues> and
>> we can explore the details further.
>>
>> Good Luck.
>>
>>
>> -          Mark
>>
>
>
>
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-- 
Johnny Billquist                  || "I'm on a bus
                                   ||  on a psychedelic trip
email: bqt at softjar.se             ||  Reading murder books
pdp is alive!                     ||  tryin' to stay hip" - B. Idol