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-
- Preface to Hedrick's
- "Introduction to the Internet Protocols"
- for Amateur Packet Radio
-
-
- Copyright 1987 Bdale Garbee, N3EUA.
- Permission to copy for non-commercial purposes granted.
-
-
- Charles Hedrick of RUTGERS, the State University of New Jersey, has written
- a very important document... a description of the "world of TCP/IP" that
- manages to be both a reasonable introduction for the non-technical or mildly
- technical individual, and an excellant starting point for anyone interested
- in learning more about the family of networking protocols commonly referred
- to as "TCP/IP".
-
- The only difficulty with this document for those who are trying to learn more
- about TCP/IP in the Amateur Radio "Packet" environment, is that the experience
- Mr. Hedrick works from is almost entirely with the wired networks common in
- universities and businesses, where various computer systems are networked
- together using some form of wire (usually coaxial cable as in Ethernet, or
- fibre optic cabling as in Pronet).
-
- The individual who is familiar with radio transmission will easily recognize
- differences between the wired environment and the on-air environment. This
- does not mean that the protocols are unfit for use on the air, it simply means
- that we need to be careful when *implementing* the protocols in software for
- use on the radio that we don't make assumptions that aren't valid on the air!
-
- Mr. Hedrick mentions several protocols that can "ride on top of" TCP, such as
- Sun's Network File System, NFS. Some of the applications that he talks about,
- including NFS, while wonderful on wired networks, are somewhat unreasonable
- for packet radio until or unless we have *much* higher speed modems. Wired
- networks can easily run at 10 million bits per second, while packet ranges
- from 300 bits per second on HF, to perhaps 56 thousand bits per second on
- UHF. Contemporary TCP/IP on packet may therefore not provide quite the same
- level of "wonderfulness" that is available to users of wired networks, but
- it certainly provides a dramatic improvement in potential services for the
- "next generation" of packet radio.
-
- The KA9Q Internet Package is currently the most common TCP/IP implementation
- (if not the only one!) in use on Amateur Packet Radio. The software supports
- the IBM PC and clones, and provides IP, ICMP, TCP, UDP, and ARP as basic
- services, and implements the FTP, Telnet, and SMTP protocols as applications.
- The Package also includes a separate mail user interface program by N3EUA
- called BM, and software from PA0GRI for forwarding PBBS mail over TCP. An
- associated set of software packages provide replacement ROM firmware for
- several TNC's, allowing them to be used with the KA9Q TCP/IP Package. At
- least two commercial manufacturers, AEA and Kantronics, now support the KISS
- protocol in their TNC's, making them useable with TCP/IP. Various folks are
- busily writing additional application protocol modules, and porting the
- package to other machines (Macintosh, Amiga, various Unix systems, etc.).
-
- Ok, now that we've primed you about what to watch out for, and hopefully
- helped you find the parts that you need to take "with a grain of salt", dig
- on in and read Hedrick's paper! And when you're done, if you want to learn
- more about how it all works, read the documents (RFC's and IEN's) that he
- mentions in the references... and if you're really brave, and know or want to
- learn the C programming language, dig in and read the NET.EXE sources...
-
- Who knows? Your life may never be the same again!
-
-