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TCP-IP Digest Vol. 1 No. 08
TCP/IP Digest Friday, 11 Dec 1981 Volume 1 : Issue 8
Today's Topics:
TCP/IP for CDC CYBER Mainframes
Mail Between NCP and TCP Hosts -- RFC801 Excerpts
Relating ArpaNet Protocols to the ISO Reference Model
TCP/IP Conversion Timetable & Documents -- RFC801 again
Tidbit about UK INDRA Project
----------------------------------------------------------------------
Subject: TCP/IP for CDC CYBER Mainframes
From: SITNIK at OFFICE-8
Tektronix has implemented TCP/IP on their CDC CYBER mainframe.
The project is being directed by Tim Fallon, (415) 627-5471. Tim
doesn't mind being contacted and in fact, would like to
distribute TCP to anyone who is interested with the understanding
that there is no committment of future support by Tektronix. He
is currently exploring the distribution issue with the Tektronix
legal department.
The Tektronix implementation of TCP/IP runs at a System Control
Point (SCP) under the NOS operating system. Interface with the
user is through SCP macro calls. Interface to the network is via
a Hyperchannel device drive which runs in a peripheral processor.
Tim is not aware of anyone working on a NOS/BE version of TCP.
Rich Sitnik
------------------------------
From: csk at UCLA-Security (Charley Kline)
Subject: mail among tcp/ncp hosts
A while ago, the following question was asked and I didn't see an
answer to it in this digest. Can someone answer it. Thanks.
As TCP/IP becomes the standard, many hosts are coming online with
only TCP/IP protocols. Can someone explain where and how one uses
mail gateways to get mail to/from hosts which are using NCP
protocols with those using TCP/IP protocols while the transition
is taking place?
--charley
[ I believe that the plan for transition is well detailed in RFC801,
which is availible for FTP from the NIC using account "anonymous",
and your name for the password. File is <netinfo>rfc801.txt
I have included pieces here for everybody to see. -Mike ]
------------------------------
Subject: RFC801 Excerpts about NCP <-> TCP Mail and File Transfer
Network Working Group J. Postel
Request for Comments: 801 ISI
For FTP, there will be provided one or more relay hosts. An FTP
relay host will implement both the NCP and TCP environments, both
user and server Telnet, and both user and server FTP in both
environments. Users requiring FTP service between hosts in
different environments will first connect via Telnet to an FTP
relay host, then use FTP to move the file from the file donor host
to the FTP relay host, and finally use FTP to move the file from
the FTP relay host to the file acceptor host. (See Appendix B.)
For Mail, hosts will implement the new Simple Mail Transfer
Protocol (SMTP) described in RFC 788. The SMTP procedure provides
for relaying mail among several protocol environments. For
TCP-only hosts, using SMTP will be sufficient. For NCP-only hosts
that have not been modified to use SMTP, the special syntax
"user.host@forwarder" may be used to relay mail via one or more
special forwarding host. Several mail relay hosts will relay mail
via SMTP procedures between the NCP and TCP environments, and at
least one special forwarding host will be provided.
------------------------------
From: Michael Muuss <mike@brl>
Subject: Relating ArpaNet Protocols to the ISO Reference Model
Whilst reading a copy of "FY80 Final Report: Cable Bus Applications
in Command Centers" from the Mitre Corporation which was kindly provided
to me by Steve Holmgren <Steve@Mitre>, I discovered a most interesting
comparison between the TCP/IP based ArpaNet, and the ISO Reference Model.
Included is basically the following picture:
ISO Reference Model | ArpaNet Environment
------------------------|-------------------------------------
Application |
------------------------|
Presentation | Virtual Terminal Protocol
------------------------|
Session |-------------------------------------
------------------------|
Transport | Transmission Control Protocol/
------------------------| InterNet Protocol
Network |-------------------------------------
------------------------|
Data-Link Cntrl | Variety of Low-Level Network
------------------------| Access Mechanisms
Physical |
------------------------|-------------------------------------
Also there is the following descriptive text:
"At the lower protocol levels there is no natural intersection of the
DARPA-like architectures with the ISO Reference Model (RM), but
above layer four in the RM and the end-to-end transport layer in
the DARPA model an eventual mergins of models is possible.
TCP contains some session layer mechanisms and our Virtual Terminal
Protocol (VTP) contains both session and presentation functions, but
the splitting out of these functions in the VTP model is possible and
would not significantly change the protocol itself. Naturally, a VTP
that fits within the open systems architecture would need to utilize
certain data transformation services of the presentation layer and data
transfer controlling services of the session layer. This could be done
by using appropriately constructed presentation and session protocols."
[pp 17-19]
------------------------------
From: Michael Muuss <mike@brl>
Subject: TCP-IP Conversion Timetable & Documents, from RFC801
RFC 801 November 1981
NCP/TCP Transition Plan
Milestones When
---------- ----
First Internet Service already
A few hosts are TCP-capable and use TCP-based services.
First TCP-only Host already
The first TCP-only host begins use of TCP-based services.
Telnet and FTP Relay Service already
Special relay accounts are available to qualified users with a
demonstrated need for the Telnet or FTP relay service.
Ad Hoc Mail Relay Service already
An ad hoc mail relay service using the prototype MTP (RFC 780) is
implemented and mail is relayed from the TCP-only hosts to
NCP-only hosts, but not vice versa. This service will be replaced
by the SMTP service.
Last NCP Conversion Begins Jan 82
The last NCP-only host begins conversion to TCP.
Mail Relay Service Jan 82
The SMTP (RFC 788) mail service begins to operate and at least one
mail relay host is operational, and at least one special forwarder
is operational to provide NCP-only host to TCP-only host mail
connectivity.
Normal Internet Service Jul 82
Most hosts are TCP-capable and use TCP-based services.
Last NCP Conversion Completed Nov 82
The last NCP-only host completes conversion to TCP.
Full Internet Service Jan 83
All hosts are TCP-capable and use TCP-based services. NCP is
removed from service, relay services end, all services are
TCP-based.
Documents
---------
The following RFCs document the protocols to be implemented in the
new IP/TCP environment:
IP RFC 791
ICMP RFC 792
TCP RFC 793
Telnet RFC 764
FTP RFC 765
SMTP RFC 788
Name Server IEN 116
Assigned Numbers RFC 790
These and associated documents are to be published in a notebook, and
other information useful to implementers is to be gathered. These
documents will be made available on the following schedule:
Internet Protocol Handbook Jan 82
Implementers Hints Jan 82
SDC IP/TCP Specifications Jan 82
Expanded Host Table Jan 82
------------------------------
From: PKIRSTEIN at USC-ISI
Subject: Re: TCP-IP Digest, Vol 1 #6
In response to your message sent 18 Nov 81 5:39:59-EDT (Wed)
Mike,
There is a lot of things one can say about the INDRA project. What level, and
what length interests you. The project has been going in some form for
eight years, and we are deeply involved in providing services for UK groups
to have terminal, file and mail connectiviity with US groups who are
both on ARPANET or TElENET in the US, and on SRCNET or PSS in the UK. Thus
the project is like CSNET, but also as a considerable research congent.
We are active in various Internet and satelite projects as well.
Peter Kirstein
END OF TCP-IP DIGEST
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