[Simh] DECnet for TOPS-10

[Rob Jarratt]

I haven't been paying proper attention and ended up asking the wrong person
some questions.

Has anyone successfully installed DECnet on TOPS-20 on SIMH using Johnny
Erikkson's code? If so can you explain which virtual tape you used and what
documentation you used to explain the procedure? 

>From what I have been able to discover it seems that the virtual tapes that
are available do not match the documentation that is available, so I am
having trouble marrying the two and following a procedure to get it
installed. 

Regards

Rob

> -----Original Message-----
> From: simh-bounces at trailing-edge.com [mailto:simh-bounces at trailing-
> edge.com] On Behalf Of Johnny Eriksson
> Sent: 14 April 2013 21:10
> To: simh at trailing-edge.com
> Subject: Re: [Simh] DECnet for TOPS-10
> 
> <r.jarratt at computer.org> wrote:
> 
> > That has got to be worth integrating into the latest SIMH. Does that
> > mean we can get DECnet running on TOPS-10 on SIMH? I would love to
> > know how you actually install and set it up on TOPS-10.
> >
> > I will try to find some time to get the KMC/DUP into the latest SIMH.
> 
> You are welcome.  A number of random points:
> 
> * My code sends the DDCMP frames out as UDP datagrams, and receives
>   frames the same way.  You simply specify src/dst ports, and possibly
>   an address (defaulting to 127.0.0.1).  This means that there is no
>   need to do elaborate (blocking) setups of TCP connections etc. from
>   inside the simulator.  This also makes it trivial to connect two
>   simulators running on the same machine, or on the same (trusted) LAN.
> 
> * A side effect of this is that you can have a helper process on your
>   machine that does the TCP magic and also encrypts the traffic out
>   on the evil internet.  My normal (at the moment defunct) setup is
>   done that way.  One such program is on the site, named "stuk2.c"
>   (don't ask...)
> 
> * You can in theory write a helper process to talk to some real
>   piece of hardware.  I have not tested, but it should work to send
>   the frames to a serial port and connect it to a real machine
>   running async DECnet on a terminal line...
> 
> * The current crypto in stuk2 is weak.  Not the algorithm itself,
>   RC4 (tm) is used, but some random padding etc. should be applied
>   on the data stream, since it normally consists of 6-byte idle
>   frames, with mostly known bits...
> 
> * The actual KS10 supports one KDP with 2 DUPs.  There are several
>   reasons for this, like unibus load, unibus space and speed.  This
>   places some limits in case one wants to build a network of emulators
>   and want to run both ANF and DECnet.  The KMC itself supports 16
>   if I remember correctly.  We should have at least 6-8, and allow
>   for a fairly simple mod to Tops10 to handle them.
> 
> * I am willing to help out, but I have very limited time until after
>   the CuG conference, mid May.
> 
> > Regards
> >
> > Rob
> 
> --Johnny
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