4 Oct
2000
4 Oct
'00
9:57 p.m.
Just to let everyone know, Stephen Schultz was right: I needed arp table
entries as he described.`
Thanks to him and Greg Lehey for their useful replies.
Frank
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The reason for publishing an ARP entry on the hosting system is
so that other systems on the LAN know how to get to the simulated
11 via the P11 hosting system. If the hosting system doesn't
publish an ARP entry the gateway, etc won't know to send the packets
to the machine running P11.
I know it can't - I asked him about it :) That's when I first
discovered that nothing was able to communicate with the simulated
11 - the 11 will not send anything unless it's able to get a
response to its ARP request. On the hosting side it would be
possible perhaps to use a "interface route" but 2.11 can not do that
and will block waiting for an ARPREPLY.
Steven
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The reason for publishing an ARP entry on the hosting system is
so that other systems on the LAN know how to get to the simulated
11 via the P11 hosting system. If the hosting system doesn't
publish an ARP entry the gateway, etc won't know to send the packets
to the machine running P11.
I did that with a static route entry.
I know it can't - I asked him about it :) That's when I first
discovered that nothing was able to communicate with the simulated
11 - the 11 will not send anything unless it's able to get a
response to its ARP request. On the hosting side it would be
possible perhaps to use a "interface route" but 2.11 can not do that
and will block waiting for an ARPREPLY.
As I say, it's not that simple. I used it without trouble for years.
Recently something broke, and I suspect it trashed my root file
system, and I haven't had time to go back and fix it. Since others
have the rest running, it's obviously nothing fundamental.
Greg
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From Frank Wortner <frank(a)wortner.com> Thu Oct 5
04:37:09 2000
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From: Frank Wortner <frank(a)wortner.com>
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To: PDP-11 Unix Preservation Society <pups(a)minnie.cs.adfa.edu.au>
Subject: [pups] Default P11 Emulator Clock Rate
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This is just an FYI for anyone playing with the Begemot P11 emulator ...
The default clock rate on P11 is 50 Hz. While this corresponds to AC line
frequency in many parts of the world, it is not correct for the
U.S., where 60 Hz is the norm. Since PDP-11 Unix was developed in the
U.S., the bootable distributions probably assume a 60 Hz clock
also. When the software and "hardware" disagree on clock rates, problems
happen.
My emulated 11 had difficulties keeping accurate time until I discovered
the 50 Hz clock rate. After I changed it to 60, the emulator's time was
remarkably accurate!
If you want to change the default clock rate, you can do so in the source
(look for the symbol "clock_rate" in "main.c"), or you can just add
set clock_rate 60
into your p11conf file. This will override the default in the emulator
program.
Have fun -- I certainly am! :-)
Frank
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From "Steven M. Schultz"
<sms(a)moe.2bsd.com> Thu Oct 5 01:24:07 2000
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Date: Wed, 4 Oct 2000 08:24:07 -0700 (PDT)
From: "Steven M. Schultz" <sms(a)moe.2bsd.com>
Message-Id: <200010041524.IAA19559(a)moe.2bsd.com>
To: pups(a)minnie.cs.adfa.edu.au
Subject: Re: [pups] Networking With 2.11 BSD and Begemot Emulator
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Hi -
From: Greg Lehey <grog(a)lemis.com>
No, that wasn't me. FreeBSD doesn't have a tap driver. Do you mean
Frank?
Sure it does. The FreeBSD 4.1.1 release notes say so ;)
Before that the 'if_tap.c' module was available (for some time)
as a download that could be retrieved from the author's site.
The missing
piece I forgot earlier was on the hosting machine's
side to publish an ARP entry for the simulated 11.
I'm pretty sure we weren't using arp at all. tun is a point-to-point
interface. I'm not
sure how ARP can be made to work thru the 'tun' device.
I don't think it can. I think Harti used some magic there. From "Steven M. Schultz"
<sms(a)moe.2bsd.com> Thu Oct 5 08:27:58 2000
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Date: Wed, 4 Oct 2000 15:27:58 -0700 (PDT)
From: "Steven M. Schultz" <sms(a)moe.2bsd.com>
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To: pups(a)minnie.cs.adfa.edu.au
Subject: Re: [pups] Default P11 Emulator Clock Rate
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Hi -
From: Frank Wortner <frank(a)wortner.com>
The default clock rate on P11 is 50 Hz. While this corresponds to AC line
frequency in many parts of the world, it is not correct for the
U.S., where 60 Hz is the norm. Since PDP-11 Unix was developed in the
U.S., the bootable distributions probably assume a 60 Hz clock
Yes, the bootable 2.11 distribution assumes a 60Hz clock. That is
easily changed though for folks that live in 50Hz areas. Edit the
kernel config file and change LINEHZ to 50. The rest of the system
has been changed to ask the kernel for the clockrate so there shouldn't
be any compiled in assumptions outside the kernel (if I overlooked
any let me know and I'll fix it).
My emulated 11 had difficulties keeping accurate time
until I discovered
the 50 Hz clock rate. After I changed it to 60, the emulator's time was
remarkably accurate!
Indeed it is accurate. Earlier versions of P11 would lose time
very rapidly if the PDP-11 was "busy" - but the latest version of
P11 is fantastic at keeping time. If you run 'ntpd' on the 11 the
time stays even closer to "real".
Steven Schultz
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From Greg Lehey <grog(a)lemis.com> Thu Oct 5
13:03:25 2000
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From: Greg Lehey <grog(a)lemis.com>
To: "Steven M. Schultz" <sms(a)moe.2bsd.com>
Cc: pups(a)minnie.cs.adfa.edu.au
Subject: Re: [pups] Networking With 2.11 BSD and Begemot Emulator
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On Wednesday, 4 October 2000 at 8:24:07 -0700, Steven M. Schultz wrote:
Hi -
I stand corrected:
From: Greg Lehey <grog(a)lemis.com>
No, that wasn't me. FreeBSD doesn't have a tap driver. Do you mean
Frank?
Sure it does. The FreeBSD 4.1.1 release notes say so ;)
Before that the 'if_tap.c' module was available (for some time)
as a download that could be retrieved from the author's site. revision 1.1
date: 2000/07/20 17:01:10; author: nsayer; state: Exp;
Add the tap driver.
The tap driver is used to present a virtual Ethernet interface to the
system. Packets presented by the network stack to the interface are
made available to a character device in /dev. With tap and the bridge
code, you can make remote bridge configurations where both sides of
the bridge are separated by userland daemons.
This driver also has a special naming hack to allow it to serve a similar
purpose to the vmware port.
Submitted by: myevmenkin(a)att.com, vsilyaev(a)mindspring.com
Ah well, I still haven't used it.
The missing piece I forgot earlier was on the hosting
machine's
side to publish an ARP entry for the simulated 11.
I'm pretty sure we weren't using arp at all. tun is a point-to-point
interface. I'm not sure how ARP can be made to work thru
the 'tun' device.
I don't think it can. I think Harti used some magic there.
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Frank Wortner