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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
-
-
-