I've been trying to set up an emulated PDP-11 running 2.11 BSD. Just for
the fun, I'm trying to get the 11 to talk on a LAN. Unfortunately, it's
not working.
My configuration is Begemot P11 Version 2.7 running under
FreeBSD 4.1.1. I've booted 2.11, configured a custom networking kernel,
installed the unix and netnix images, changed the IP addresses in
/etc/hosts to match my LAN, run mkhosts to rebuild /etc/hosts.dir and
/etc/hosts.pag and rebooted.
On the P11 front, I've built a fake qma.rom file populated with zeros --
just like the P11 README file said, made sure that I had a tun driver
configured in my FreeBSD system, and started P11. Then I did an
ifconfig tun0 host-IP-address emulator-IP-address up
Running ifconfig on the host confirmed that things *seemed* to be OK:
# ifconfig tun0
tun0: flags=8051<UP,POINTOPOINT,RUNNING,MULTICAST> mtu 1518
inet6 fe80::260:8ff:febd:5882%tun0 --> :: prefixlen 64 scopeid 0xb
inet host-IP-address --> emulator-IP-address netmask 0xffff0000
Opened by PID 32199
The IP addresses are identical in the first three octets, and differ only
in the last octet.
Unfortunately, once I boot 2.11 BSD, I can't contact the "outside
world" from the emulator, nor contact the emulator from the
outside. No telnet, no ftp, pings just hang.
Everything looks OK from inside:
# ifconfig qe0
qe0: flags=63<UP,BROADCAST,NOTRAILERS,RUNNING>
inet emulator-IP-address netmask ffff0000 broadcast Bcast-IP
What am I missing?
Thanks in advance,
Frank
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Date: Wed, 4 Oct 2000 09:17:22 +0930
From: Greg Lehey <grog(a)lemis.com>
To: Frank Wortner <frank(a)wortner.com>
Cc: PDP-11 Unix Preservation Society <pups(a)minnie.cs.adfa.edu.au>,
Hartmut Brandt <brandt(a)fokus.gmd.de>,
Joerg Micheel <joerg(a)begemot.org>
Subject: Re: [pups] Networking With 2.11 BSD and Begemot Emulator
Message-ID: <20001004091722.C1760(a)wantadilla.lemis.com>
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On Tuesday, 3 October 2000 at 16:02:17 -0400, Frank Wortner wrote:
> I've been trying to set up an emulated PDP-11 running 2.11 BSD. Just for
> the fun, I'm trying to get the 11 to talk on a LAN. Unfortunately, it's
> not working.
There's a bug. It used to work, and *something* changed. I've been
meaning to look at it, but it's currently waiting on the tuit queue.
> My configuration is Begemot P11 Version 2.7 running under
> FreeBSD 4.1.1. I've booted 2.11, configured a custom networking kernel,
> installed the unix and netnix images, changed the IP addresses in
> /etc/hosts to match my LAN, run mkhosts to rebuild /etc/hosts.dir and
> /etc/hosts.pag and rebooted.
>
> On the P11 front, I've built a fake qma.rom file populated with zeros --
> just like the P11 README file said, made sure that I had a tun driver
> configured in my FreeBSD system, and started P11.
I know the README says this will work, but I haven't been able to get
it to work that way. Somewhere I have a real image; I'll see if I can
find it.
Greg
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>From "Steven M. Schultz" <sms(a)moe.2bsd.com> Wed Oct 4 10:11:10 2000
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Date: Tue, 3 Oct 2000 17:11:10 -0700 (PDT)
From: "Steven M. Schultz" <sms(a)moe.2bsd.com>
Message-Id: <200010040011.RAA09035(a)moe.2bsd.com>
To: frank(a)wortner.com, pups(a)minnie.cs.adfa.edu.au
Subject: Re: [pups] Networking With 2.11 BSD and Begemot Emulator
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Hi --
> From: Frank Wortner <frank(a)wortner.com>
>
> I've been trying to set up an emulated PDP-11 running 2.11 BSD. Just for
> the fun, I'm trying to get the 11 to talk on a LAN. Unfortunately, it's...
>
> My configuration is Begemot P11 Version 2.7 running under
> FreeBSD 4.1.1. I've booted 2.11, configured a custom networking kernel,
> installed the unix and netnix images, changed the IP addresses in...
>
> ifconfig tun0 host-IP-address emulator-IP-address up
>
> # ifconfig tun0
> tun0: flags=8051<UP,POINTOPOINT,RUNNING,MULTICAST> mtu 1518
> inet6 fe80::260:8ff:febd:5882%tun0 --> :: prefixlen 64 scopeid 0xb
> inet host-IP-address --> emulator-IP-address netmask 0xffff0000
> Opened by PID 32199
>
> The IP addresses are identical in the first three octets, and differ only
> in the last octet.
>
> Unfortunately, once I boot 2.11 BSD, I can't contact the "outside
> world" from the emulator, nor contact the emulator from the
> outside. No telnet, no ftp, pings just hang.
> What am I missing?
You're missing ARP.
'tun' only works with IP - ARP packets are not IP and do not pass
thru the 'if_tun' driver.
I have (using BSD/OS 4.1's if_tun which is probably the same as
FreeBSD's) an emulated 11 going quite nicely.
What you need to do ON THE 11's SIDE, is populate his arp table with
the information about any host on the local LAN that the 11 will
want to talk to
In /etc/netstart on the 11 side just after the 'ifconfig' lines:
ifconfig qe0 inet netmask $netmask $hostname broadcast $broadcast up -trailers >/dev/console 2>&1
# ifconfig sl0 inet 192.254.254.2 192.254.254.1 -arp -trailers >/dev/console 2>&1
# slattach /dev/ttyS6 9600
# Next line needed when running under the Begemot emulator
arp -s 206.139.202.1 "0:0:c:3d:e9:f7" pub
arp -s 206.139.202.51 "0:a0:24:78:9c:21" pub
arp -s 206.139.202.200 "0:90:27:88:64:74" pub
arp -s 206.139.202.201 "08:0:2b:f:5b:a6" pub
arp -s 206.139.202.209 "0:40:5:a4:72:27" pub
ifconfig lo0 inet localhost up -trailers >/dev/console 2>&1
Typically you only need the ARP info for the hosting system and
the default gateway.
Oh, there's a bug in P11 that after 25 days of calendar up time the
clock on the 11 basically stops ticking. I've a fix I came up with
(and submitted to the author) but it'll be a couple weeks until I
know for sure if it's the right fix (32bit overflow in a calculation).
Steven Schultz
sms(a)to.gd-es.com
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>From Greg Lehey <grog(a)lemis.com> Wed Oct 4 11:29:11 2000
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Date: Wed, 4 Oct 2000 10:59:11 +0930
From: Greg Lehey <grog(a)lemis.com>
To: "Steven M. Schultz" <sms(a)moe.2bsd.com>
Cc: frank(a)wortner.com, pups(a)minnie.cs.adfa.edu.au
Subject: Re: [pups] Networking With 2.11 BSD and Begemot Emulator
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On Tuesday, 3 October 2000 at 17:11:10 -0700, Steven M. Schultz wrote:
> Hi --
>
>> From: Frank Wortner <frank(a)wortner.com>
>>
>> I've been trying to set up an emulated PDP-11 running 2.11 BSD. Just for
>> the fun, I'm trying to get the 11 to talk on a LAN. Unfortunately, it's...
>>
>> My configuration is Begemot P11 Version 2.7 running under
>> FreeBSD 4.1.1. I've booted 2.11, configured a custom networking kernel,
>> installed the unix and netnix images, changed the IP addresses in...
>>
>> ifconfig tun0 host-IP-address emulator-IP-address up
>>
>> # ifconfig tun0
>> tun0: flags=8051<UP,POINTOPOINT,RUNNING,MULTICAST> mtu 1518
>> inet6 fe80::260:8ff:febd:5882%tun0 --> :: prefixlen 64 scopeid 0xb
>> inet host-IP-address --> emulator-IP-address netmask 0xffff0000
>> Opened by PID 32199
>>
>> The IP addresses are identical in the first three octets, and differ only
>> in the last octet.
>>
>> Unfortunately, once I boot 2.11 BSD, I can't contact the "outside
>> world" from the emulator, nor contact the emulator from the
>> outside. No telnet, no ftp, pings just hang.
>> What am I missing?
>
> You're missing ARP.
>
> 'tun' only works with IP - ARP packets are not IP and do not pass
> thru the 'if_tun' driver.
>
> I have (using BSD/OS 4.1's if_tun which is probably the same as
> FreeBSD's) an emulated 11 going quite nicely.
>
> What you need to do ON THE 11's SIDE, is populate his arp table with
> the information about any host on the local LAN that the 11 will
> want to talk to
I didn't need to do this when I had the emulated net running. I did
set the netmask to 255.255.255.255, though, and put the default route
through that interface.
Greg
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>From "Steven M. Schultz" <sms(a)moe.2bsd.com> Wed Oct 4 11:59:45 2000
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Date: Tue, 3 Oct 2000 18:59:45 -0700 (PDT)
From: "Steven M. Schultz" <sms(a)moe.2bsd.com>
Message-Id: <200010040159.SAA09659(a)moe.2bsd.com>
To: grog(a)lemis.com, sms(a)moe.2bsd.com
Subject: Re: [pups] Networking With 2.11 BSD and Begemot Emulator
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> From: Greg Lehey <grog(a)lemis.com>
>
> I didn't need to do this when I had the emulated net running. I did
> set the netmask to 255.255.255.255, though, and put the default route
> through that interface.
I thought you mentioned using the 'tap' driver rather than 'tun'
at one time. If my memory hasn't failed me that would explain
why it worked since 'tap' passes ARP traffic.
The missing piece I forgot earlier was on the hosting machine's
side to publish an ARP entry for the simulated 11.
Just after ifconfig'ing tun0 up use the hosting system's mac address:
ifconfig tun0 206.139.202.200 206.139.202.203 up
arp -s shemp 0:90:27:88:64:74 pub
I'm not sure how ARP can be made to work thru the 'tun' device.
Without ARP on an ethernet I am not aware of any 'routing' that
can fill in the mac addresses in the ethernet packets.
Try pub'ing the arp entries and see if that works. Might try 'tap'
instead of 'tun' if you're looking for something else to try.
Steven Schultz
