bill.gunshannon at hotmail.com
Sat Aug 28 17:19:49 CDT 2021
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. :-)
>>> 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
>> 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.
> 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 22.214.171.124
> %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
> 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
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.
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