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From: key@UTKCS2.CS.UTK.EDU (Ken Key)
Newsgroups: comp.protocols.tcp-ip.ibmpc
Subject: Re: TCP/IP and DECnet/DOS at once
Message-ID: <8710262309.AA12558@utkcs2.CS.UTK.EDU>
Date: Mon, 26-Oct-87 18:09:55 EST
Article-I.D.: utkcs2.8710262309.AA12558
Posted: Mon Oct 26 18:09:55 1987
Date-Received: Thu, 29-Oct-87 01:57:08 EST
Sender: usenet@ucbvax.BERKELEY.EDU
Organization: The ARPA Internet
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>From: G B Reilly <reilly@facman.wharton.upenn.edu>

>Is anyone out there finding a need for both at once?
>A situation is developing here that could call for
>DECnet to talk with some VMS-based services (which are
>written by Digital - hence TCP/IP/telnet is out) and
>for TCP/IP to talk with IBM and UNIX based applications.

>Brendan

We are expecting a need for both.  We have a number of "power" users
who are going to speak DECnet-DOS and PC services to our local VAXen and 
TCP/IP for NSFnet access.  Just for fun, we stuffed a DEPCA and an 
Interlan in an AT and ran both simultaneously.  FTP'ing into a virtual 
disk was interesting (not too shabby).  This is, however, a 
very expensive solution ;-)

I have just started work on "interfacing" between the DECnet-DOS
DLL.EXE (datalink layer TSR device driver for DNDOS) and
the CMU PC/IP code.  This will allow the two systems to run over the
same board and let PC/IP to run over any Ethercards that DEC supports 
(without having to write a device driver) at the cost of TCP/IP performance.
While its true that the only card not currently supported by the CMU 
distribution and supported by the DLL interface is the DEPCA, there's 
always the future.

I have not had much time to put into the project (silly things like
Thesis work).  If anyone can share their experience in programming
for the DLL interface, I'd appreciate it.  In particular, I am
currently looking for examples of transmit and receive callback
routines (everything but is in the VAXmate Tech. Ref.)

Thanks in advance,
Ken Key
University of Tennessee Computing Center
key@utkcs2.cs.utk.edu