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STRUCTUR.ARC
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STRUCTUR.DOC
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Text File
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1989-07-20
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5KB
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82 lines
STRUCTURE OF KA9Q NET (PE1CHL VERSION)
This picture clarifies the relation between the different protocol components
present in the PE1CHL version of NET.
Transfer of information is only possible crossing horizontal lines in this
picture. E.G: Information can be transferred from TELNET to TCP, but not from
TELNET to NET/ROM level 7.
+----------------------------------------------------------------------------+
| |
| U S E R I N T E R F A C E |
| |
+------------------+-------------------+--------+-----+------+------+--------+
| | | | | | | |
| TNC, MHEARD, | NET/ROM level 7 | TELNET | FTP | SMTP | RCMD | REMOTE |
| | | | | | | |
| NETDIGI, BRIDGE, | +-----------------+--------+-----+------+------+--------+
| | | | | |
| TNC2 EMULATOR | | NET/ROM level 4 | TCP | UDP |
| | | | | |
| | +-----------------+----------------------------+--------+
| | | | |
| | | | IP / ICMP |
| | | NET/ROM level 3 | |
| | | +----+---------------------+ |
| | | | | |
+------------------+-+----------------------+----+ | |
| | ARP | |
| AX.25 Level 2 Version 1 / 2 (LAPB / UI) | | |
| | | |
+--------------------------+---------------------+----------------+----------+
| | | | |
| Direct HDLC (SCC Driver) | KISS (MBBIOS/X00) | Ethernet | SLIP |
| | | | |
+--------------------------+---------------------+----------------+----------+
| | | |
| /| | /| | | /|
|/ | |/ | | |/ |
| | | |
v v | v
MODEM TNC //=======// Other Sys
TNC, MHEARD, NETDIGI, BRIDGE and TNC2 EMULATOR are the AX.25 servers.
NET/ROM level 7 is the NET/ROM command interpreter. It is both an AX.25 and
a NET/ROM level 4 server.
TELNET, FTP, SMTP, RCMD and FINGER (not shown) are the TCP/IP servers.
REMOTE is a UDP/IP server.
NET/ROM level 4 is the transport protocol of the NET/ROM stack. It manages
connections between NET/ROM endnodes.
TCP is the transport protocol of the Internet Suite. It manages connections
between endnodes in the TCP/IP world.
UDP is the datagram protocol of the Internet Suite. It is comparable to the UI
frame transmissions of AX.25.
NET/ROM level 3 is the network protocol of the NET/ROM stack. It manages the
routing of packets between NET/ROM endnodes, relying on a table built from
information received in NODES transmissions.
IP/ICMP is the network protocol of the Internet Suite. This implementation
routes packets based on a fixed routing table.
ARP manages the mapping of Internet addresses to the addresses of the
underlying network. In the case of NET these can be amateur callsigns or
Ethernet hardware addresses.
AX.25 Level 2 manages all packet traffic on the amateur packet radio network.
it supports both virtual circuit (LAPB) and datagram (UI) modes.
Virtual circuits can be used directly by AX.25 servers, by NET/ROM level 3, and
by IP. Datagrams are only used by IP.
The drivers for HDLC, KISS, Ethernet and SLIP manage the physical lines
connected to the system. The HDLC driver provides AX.25 packets directly,
making only a MODEM necessary for amateur radio packet communication.
The KISS driver provides the same information encoded in KISS frames, which
will be sent to a TNC (in asynchronous form) for conversion to HDLC.
The Ethernet and SLIP drivers provide ways to connect systems for IP traffic
using either an Ethernet LAN or an asynchronous connection.
Rob Janssen, PE1CHL