dj.taylor4 at comcast.net
Sat Aug 28 15:13:36 CDT 2021
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.
>> 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.
I brought up a Vax Alpha 3000-300 and tried interacting with the
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.
Going the other way, Ultrix-11 would reject an ftp request from the vax,
here is the error message -
$ ftp 18.104.22.168
%TCPIP-E-FTP_NETERR, I/O error on network device
-SYSTEM-F-UNREACHABLE, remote node is not currently reachable
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 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....
It was good to find out that you can get things in/out of the Ultrix-11
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