[pups] 2.11BSD networking on simh
luvisi at andru.sonoma.edu
Fri Nov 29 11:22:09 AEST 2002
On Wed, 27 Nov 2002, Steven M. Schultz wrote:
> Hi -
> > From: Andru Luvisi <luvisi at andru.sonoma.edu>
> > I have gotten 2.11 installed on simh, I have it recognizing the simulated
> > ethernet card, and everything appears correct except the packets just
> > aren't getting in and out. The simh documentation says that the DELQA
> > card is better than the DEQNA, but I was unable to get the DELQA (qt)
> > driver to recognize the card. When I compiled the kernel to use the DEQNA
> There are TWO variants of the DELQA as I recall. One was referred
> to as the "turbo" verion (I think it was called the DELQA-YM) and
> the if_qt driver was developed and tested specifically for, and only
> for, that variant. The normal DELQA and DEQNA should use the if_qe
The qe driver does appear to recognize the DELQA. Same results as with
the DEQNA. It sees it, recognizes the ethernet address I configured it
with, and the network configuration all seems to work, but once it's all
up I can't get anywhere.
> > I have configured 2.11BSD with:
> > A valid IP address on the network the host is on.
> > The same netmask, broadcast, and gateway as the host.
> > I am running the emulator as root.
> > The docs say you won't be able to talk between the host and the emulated
> Hmmm, that seems strange. Using P11 I talk between the host (the
> machine running the emulator program) and the "PDP11" all the time.
> Ah, it has to do with ARP handling I suspect. I know that with P11
> it's IP only and thus ARP packets do not traverse the emulated ethernet
> card. If that is the case with simh as well then on the PDP11 side
> you might have to do what I did and install arp entries for everything
> on the local lan with which the PDP11 is going to communicate. That
> way the 11 already knows the 'mac' address and does not need ARP (which
> doesn't work thru the emulated ethernet) at all.
I couldn't say. I just tried setting the arp information for the gateway
in 2.11BSD, but to no avail.
> > machine, so my test for each configuration has been pinging the gateway,
> > which I know responds to pings since I can ping it from the host.
> Ah, but on the host did you publish an ARP entry so that the host
> will arp for the PDP11? I think that is required.
I just tried it, also to no avail.
> I would tinker around with installing published/proxy arp entries and
> seeing what happens.
tcpdump isn't showing me any packets coming from or to the IP or ethernet
address of the emulated PDP-11.
Andru Luvisi, Programmer/Analyst
Quote Of The Moment:
"Taking the envelope and pencil in his otherwise empty hands, the
medium feels it, stares into space, grunts, foams at the mouth, and
otherwise becomes very psychic."
- Theodore Annemann
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