On 8/28/2021 6:19 PM, Bill Gunshannon via cctech wrote:
On 8/28/21 4:13 PM, Douglas Taylor via cctalk wrote:
On 8/28/2021 1:15 PM, Bill Gunshannon via cctalk wrote:
On 8/28/21 1:03 PM, Douglas Taylor via cctalk wrote:
Yes, I did create a new kernel and copy it to the correct place and
chmod 644 the new unix file.
Did yo have fun playing with the overlays? :-)
I don't know what this means. The kernel creation was automatic, it
seemed to check for enough room.
I guess you did the bare minimum to get the network up. When I buld
a new kernel I tend to add all the devices (like multiple network cards
and serial cards) that I may want in the future. I have often had to
manually shift things around and usually create one or two additional
overlays to get it all to fit. I actually enjoy doing it. :-)
I had only toyed with the idea of adding a dzv11 so real terminals could
be connected to a real pdp11 Ultrix-11 system. I guess I'll find out
once I get there.
On my Debian system I can install ftpd and telnetd (they are still
in the Debian package list) which are the unsecure ones, but I
don't know how to configure them or start them. As in, # systemctl
restart ftpd
Probably easier to turn them on on Ultrix-11. Just modify inetd.conf.
Actually, I just looked and ftp is on by default. Telnet is not.
I edited inetd.conf to uncomment telnet. It helped.
It turns out to not be a hot topic: "How do I make my Liinux system
less secure?", but for us that noodle around with old computers
with obsolete operating systems it is exactly what we need. In the
past I remember using Filezilla to go from a Windows7 machine into
a Vax without any problem.
I suspect you will be somewhat disappointed with networking in
Ultrix-11. Not that there is something wrong with it, just that
the hardware is nothing like you are used to. In the early days
of networking it was not unusual for systems like the PDP-11 to
crash just because of the traffic passing by on their network
connection. The advent of switches helped alleviate that but it
is still common to crash a system by pushing data at it from a
modern ftp. I expect FileZila will do it. To be honest, I always
preferred Kermit for moving files. It is possible to keep packet
sizes down and even slow down the transfer rate to give the PDP
time to handle it.
bill
I brought up a Vax Alpha 3000-300 and tried interacting with the
Ultrix-11 simulation:
Starting in Ultrix-11 I could log into the vax via telnet. Ultrix-11
ftp was able to transfer a short ascii file from the Vax to the
Ultrix-11 sim.
Just another note. remember that ulimit is only 1024 on Ultrix-11 by
default. That means no file larger than 10M. Unless you raise ulimit.
Going the other way, Ultrix-11 would reject an ftp request from the
vax, here is the error message -
$ ftp 192.169.0.52
%TCPIP-E-FTP_NETERR, I/O error on network device
-SYSTEM-F-UNREACHABLE, remote node is not currently reachable
$
Been a long time. Could have to do with PTYs. Remember, FTP takes two
open connection and the number of possible connection on Ultrix-11 is
very limited.
I think I noticed that I only had 2 PTY's during the install/kernel
process. Glad you mentioned this, it had gone over my head.
Ignore the VAX error, the error was mine. I typed the ip wrong, should
have been 192.168.0.52, not 192.169.0.52. Blame it on bad eyes, old
age, small font, clumsy fingers.
Ultrix-11 would allow a telnet connection (after the change to
inetd.conf) and I could do an ls, but when I asked for a man page it
hung up. Nothing after that, had to kill it.
I told you it was very unstable. :-)
I got the same result whether I was telneting in from the Vax or
Linux computer. Probably not news to you. I wonder if real hardware
works just like this....
Sometimes, but I always found SIMH less reliable with my limited use
of it. I always preferred real hardware.
It was good to find out that you can get things in/out of the
Ultrix-11 simulation.
Like I said, I usually find Kermit over emulated serial lines to be more
efficient at moving stuff on and off. The network may be faster but
failures after 4 hours of a transfer can be very frustrating. Better
to let kkermit have it over night and then get a fresh start in the
morning.
bill
