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AMPRNews.104
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1992-06-23
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UK AMPRNET TCP/IP Newsletter
Mike Chace (G6DHU)
Volume 1 Issue 4 (6 July 1991)
1. Hello and Welcome
Well, 4 issues gone and that's clocked up the first half
year of these bi-monthly newsletters aimed at those
interested in, or starting out with TCP/IP.
As usual, if you are interested in TCP/IP and want to know
more then I can supply my TCP/IP Beginners Information Pack
which is crammed with useful stuff about what TCP/IP is all
about. There is software available for nearly all 16bit
machines namely, Amiga, Atari ST, PC and Mac. Information
about where to get them and the Beginners Pack follows.
Since the last (rather thin!) issue a lot has been happening
in the software field so this issue will be catching up
with those events. I've a got a 'hot' piece of news
concerning the 9600bps FAX modem that I mentioned in Issue
1.
2. TCP/IP Software News
2.1. G1EMM Signs Off
In case you didn't know, a month or two ago Kelvin (G1EMM),
writer of the now legendary and widely used G1EMM NOS, gave
up work on his version.
Kelvin was devoting an aweful lot of time to developing NOS,
something which is not an easy task given the rate at which
changes to KA9Qs code occur. Unfortunately, Kelvin's non
NOS workload has increased to the point where he can no
longer support it and he has therefore given up for the time
being.
I'm sure we would all like to give our thanks to Kelvin for
his efforts. I'm quite sure that without his modifications
and enhancements Amateur TCP/IP would be a lot less popular
and less advanced. He will be missed. Thanks again
Kelvin.
2.2. PA0GRI NOS
Just as Kelvin signed off, Gerard (PA0GRI) announced a new
version of his NOS. The PA0GRI version had been around for
some time but had been dormant since G1EMM gained
popularity. Gerard is now making regular updates and
enhancements following on from the 900423 KA9Q and 901130
G1EMM code.
The latest version is PA0GRI 900618 and features most of
what was present in G1EMM 901130 plus a few enhancements
such as split screen operation on ttylink connections,
session flow control and function key operations so that the
previous command can be recalled and pressing an F key can
recall a favourite command.
2.3. Encapsulation
PA0GRI also includes the 'encap' pseudo interface. What's
this I hear you cry! Well, Brian Kantor at UCSD recently
wrote RFC1226 which describes IP/AX.25 encapsulation. There
are currently two different encap schemes about, one for
IP/IP encapsulation and the other IP/AX.25.
In the first case AMPRNET IP datagrams can be routed through
the encap pseudo interface and wrapped up within another IP
datagram for another network (eg the real Internet). This
allows stations to move AMPRNET traffic across the Internet
for example. This is necessary because the AMPRNET has a
flat namespace (we're all .ampr.org domain names) and this
causes the Internet some problems.
In the second case, AX.25 frames can be wrapped up in IP
datagrams and transported via IP across another IP based
network. For instance two AMPRNET IP nodes could be
connected via an Ethernet, AX.25 users could communicate
using these AMPRNET nodes as digi/gateways running encap.
Imagine g6dhu.ampr.org (G6DHU-5) is connected to
dc0hk.ampr.org (DC0HK-5) via an Internet link. An AX25 user
local to me could type CONNECT DC0XXX via G6DHU-5, DC0HK-5.
I would hear the AX.25 frame, wrap it up in an IP datagram,
forward it (using IP) to dc0hk.ampr.org who would unwrap
the AX.25 frame and send it (on AX.25) to DC0XXX. This sort
of thing is called a wormhole connection. There are already
a number of AMPRNET IP nodes connected to each other across
the real Internet, most in the US of course.
2.4. DB3FL WNOS (Version 1m)
This is probably the most radical 'rewrite' of the NOS
software yet. Michael (DB3FL) has put some really good
operator convenience functions into WNOS. The AX.25 BBS
interface has changed somewhat and there are a few new
features.
Changes include,
More user friendly bbs - eg node connects straight from
the command line
AX25 Autorouting - as found in the German FlexNet
system
Wampes IP support - (that's what the W in WNOS stands
for)
On Screen status line - Clock, current sessions, call,
data pending
Easier session switching - ESC = command mode, F1 =
session 1 etc
Although I have this software, I've yet to receive the
manual so there are lots more features left out of the list
because I don't know what they do!
2.5. G8AMD NOS
Hayden (G8AMD) has been working hard on bug fixing the
established G1EMM final version and has added some features
of his own. Most notably Hayden is working on making the
NOS mailbox fully W0RLI compatible for both forward and
reverse-forward mail. He also plans changes to the handling
of BIDs with a history file and automatic clean up of that
file on a timed basis. In short, these features will make
the NOS mailbox just about as powerful as any of the
standard mailboxes eg AA4RE, MBL etc.
Most of Hayden's work is still under development and/or
testing and he will announce it when ready - so look out!
Drop Hayden a line at G8AMD@GB7SUT.
2.6. AmigaNOS (v2.7)
John, G1YYH@GB7NWP, has been busy making some changes to his
version of NOS for the Commodore Amiga machine. New in
version 2.7 are
status command - returns time, time NOS started,
elapsed time, whether station is attended, and message
of the day (motd).
source command - 'source' allows you to 'read in'
another file to the start-up file.
Changes and fixes to timing.
2.7. PE1CHL NET
Rob (PE1CHL) now has his much enhanced NET running on Atari
ST (all models), PC and Xenix. I believe a port to Amiga is
also underway. NET now includes
FTL0 support for up/download of files and mail to and
from the PacSats.
FTL0 broadcast support
Mailbox now supports reverse forward using the BBSFWD
protocol.
ICMP 'Host Unreachable' and 'Source Quench' support
added.
TCP upper bound timer
Support for acting as an X.25 gateway.
It is now possible to write strings to a connection
from the command line
Contact Paul (G1PLT) either QTHR or via mailbox GB3XP, for
details of PE1CHL NET.
3. 9600 bps Modem
As I mentioned in Issue 1 of this newsletter, there were
some trials of a 9600bps modem between WA8OOH and WB8WKA.
What was interesting about this modem is that it was based
on a Yamaha FAX chip (V.29) and could be interfaced to
radios without the sort of surgery required by other 9600
modems such as G3RUH.
Both stations (one NOS, one MSYS) told of good throughput,
upto 8kbps in some cases and that most common 2m radios
tried worked first time.
I understand that Pac-Comm is now making the WB8WKA modem
into a saleable product and it should be out very soon.
9600bps without the rig surgery! What's the catch ? Well
there are 2! Firstly these FAX modems require a 'training'
time of some 200-300ms to achieve synchronisation - that's a
long time in terms of 9600bps data! Nevertheless a full
duplex link or one with high frame lengths might be able to
offset this problem in the most part. Secondly, the modem
is of course V29 which makes it incompatible with other
high speed modems such as G3RUH etc.
Despite the drawbacks, I think that it really does need a
modem such as this without requiring the rig surgery to get
high speed finally off the ground. It only remains to be
seen just how expensive it will be!
4. Network News
4.1. Cambridge Area
Only one contributor since the last newsletter. Paul
(G0MHD) reports on progress since I last gave details on his
local subnet, in the Cambridge area.
The Cambridge area now has its own TCP/IP gateway.
GB7MHD is located at St Ives, just a few miles north west of
Cambridge and as many miles east of Huntingdon.
GB7MHD has two ports. 144.625 with full TCP/IP access and
432.675 for mail forwarding. It is possible to use the 70cm
port and the local nodes for TCP/IP trafic.
GB7MHD is running Msys 1.11 at the present time.
Why don't *YOU* write in with details of your local
network. Let people know about what you are doing through
this newsletter. Drop me a line at any of the addresses
below.
5. IP Addresses
There's been a lot of flak on the mailbox network lately,
directed towards Dave (G4CLI) our IP address coordinator,
most of it complaining about lack of response. Dave has a
busy work schedule as well as keeping the UK IP address
database up to date. So please, take it easy! After all,
you don't need an official address right away.
As I have explained before, contact your IP locals, agree a
temporary 'high end' eg .253 address and use that. You can
switch to the pukka one when it comes through. Unlike the
Amateur Radio license, you don't have to have an official IP
address to get going on IP. OK ?
6. 221 Closing
Well that's it for another couple of months. Thanks to
those who contacted me..
G0MHD, G4FIP, G7JCJ, G1PJJ, G8AMD, DC0HK/GM8SAU, G1PLT
and G0LXC
May I remind you that if you send disks to the people
mentioned above, please include disks, return postage and
tell them what you want (you can't expect them to be mind
readers!).
Articles and your comments to...
84 Frankland Close
Bath
Avon BA1 4EL
or via email (mikec@praxis.co.uk), AMPRNET g6dhu.ampr.org
[44.131.20.3] or NTS (G6DHU @ GB7IMB).
73, Mike