191 lines
6.0 KiB
Groff
191 lines
6.0 KiB
Groff
.\" Copyright 1996 The Board of Trustees of The Leland Stanford
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.\" Junior University. All Rights Reserved.
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.\"
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.\" Author: Jonathan Stone
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.\"
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.\" Permission to use, copy, modify, and distribute this
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.\" software and its documentation for any purpose and without
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.\" fee is hereby granted, provided that the above copyright
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.\" notice and the above authorship notice appear in all copies.
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.\" Stanford University makes no representations about the suitability
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.\" of this software for any purpose. It is provided "as is" without
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.\" express or implied warranty.
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.Dd March 10, 1996
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.Dt STRIP 4
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.Os NetBSD 1.1
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.Sh NAME
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.Nm strip
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.\" Why doesn't this work right? mdoc(7) nor mdoc.samples(7) lists
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.\" .Nd, except for a passing reference in the latter.
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.Nd packet-mode network device driver for the Metricom Ricochet radio
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.Sh SYNOPSIS
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.\" want to write
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.\" .Sy pseudo-device
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.\" .Nm tun
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.\" .Op Ar count
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.\" so that .Nm is just "tun", but if we do that we get a line break
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.\" after "pseudo-device", ick.
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.Nm pseudo-device strip
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.Op Ar count
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.Sh DESCRIPTION
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Configures
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.Ar count
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.Nm strip
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interfaces, named
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.Sy st Ns Ar 0 ,
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.Sy st Ns Ar 1 ,
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etc, into a kernel built from a config file containing the
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given entry.
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.Pp
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Each
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.Nm strip
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interface is a pseudo-device driver for the Metricom Ricochet radio,
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operating in peer-to-peer packet mode.
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.Pp
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The STRIP driver takes outbound network packets, encapsulates them using the
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Metricom "starmode" framing, and sends the packets out an RS-232
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interface to a Metricom
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.Em Ricochet
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radio. Packets arriving from the radio
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via the serial link are decapsulated and then passed up to the local
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host's networking stack.
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.Pp
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.Nm STRIP
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is an acronym for
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.Sy St Ns armode
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.Sy R Ns adio
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.Sy IP.
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.Pp
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In many ways,
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the
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.Nm strip
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driver is very much like the
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.Nm sl
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SLIP pseudo-device driver. A
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.Nm strip
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device is attached to a tty line with
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.Xr slattach 8 .
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Once attached, the interface is configured via
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.Xr ifconfig 8 .
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The major difference between the
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.Xr sl 4
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SLIP pseudo-device driver and the
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.Nm strip
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driver is that SLIP works only between two hosts over
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a dedicated point-to-point connection. In contrast,
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.Nm strip
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sends
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packets to a frequency-hopping radio, which can address packets to
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any peer Metricom radio. rather than just to a single host at the
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other end of a point-to-point line. Thus, one
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.Nm strip
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pseudo-device is usually sufficient for any kernel.
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.Pp
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In other respects, a
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.Nm strip
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interface is rather like an Ethernet interface.
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Packets are individually addressed, and subsequent packets can
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be sent independently to different MAC addresses. However,
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the "Star-mode" framing and MAC addressing are not in any way
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compatible with Ethernet. Broadcast or multicast to more than one radio is not
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possible, due to the independent frequency-hopping operation of the radios.
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The interface flags
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.Dv IFF_POINTOPOINT
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and
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.Dv IFF_BROADCAST
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are not supported on
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.Nm strip
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interface.
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.Pp
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In other words,
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.Nm strip
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implements a multiple-access, non-broadcast device, accessed via
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an RS-232 serial line, using a proprietary packet framing scheme.
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.Pp
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This version
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.Nm strip
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driver maps IP addresses to Metricom radio addresses using
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statically configured entries in the normal routing table. These entries
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map IP addresses of peer radios to the MAC-level addresses.
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The exact syntax of this mapping and an example are discussed below.
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The Internet Assigned Numbers Authority (IANA) has allocated an ARP
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type code for use with STRIP. A future version of this driver will
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support
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.Xr arp 4
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to obtain the IP address of reachable peer radios dynamically.
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.Pp
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.Sh Address configuration.
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This version of the STRIP driver requires static pre-configuration of
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the mapping from IP addresses to radio MAC addresses.
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The
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.Xr route 8
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command should be used to bind a peer STRIP host's radio IP address
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to the peer's link-level radio address. Radio addresses are encoded
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using the hex equivalent of the radio's decimal ASCII address.
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For example, the following route command will
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configure a routing entry to a radio with a MAC address of 1234-5678,
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and an IP address 10.11.12.13:
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.Pp
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.br
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.in 10
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route add -host 10.11.12.13 -link 1:2:3:4:5:6:7:8
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.br
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.in 5
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.Pp
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Generalising from this example to other IP addresses and to other 8-digit MAC addreses
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should be clear.
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.Pp
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.Sh Radio configuration.
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The Metricom radios can auto-baud at speeds up to 38.4k baud.
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At higher speeds -- 57600 or 115200 -- the radio cannot autobaud.
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When running at high speeds, the radio's serial port should be
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manually configured to permanently run at the desired speed.
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Use a terminal emulator and the Hayes command
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.Em ATS304=115200
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to set the serial baudrate to the specified number (or 0 for autobaud). The command
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.Em AT&w
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will then save the current radio state in non-volatile memory.
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.Pp
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Metricom radios can operate in either "modem-emulation" mode
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or in packet mode (Starmode). The
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.Nm strip
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driver automatically detects if the radio has fallen out of starmode,
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and resets it back into starmode, if the baud rate was set correctly
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by
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.Xr slattach 8 .
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.Pp
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.\" Why isn't .Ss documented in mdoc(7) and mdoc.samples(7)?
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.\" .Sh DIAGNOSTICS
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.Pp
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.Sh SEE ALSO
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.Xr inet 4 ,
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.Xr arp 4 ,
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.Xr route 8 .
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.Xr slip 4 ,
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.Xr slattach 8 ,
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.Sh BUGS
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Currently is IP-only. Encapsulations for AppleTalk and ARP have been defined,
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but are not yet implemented in this driver.
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.Pp
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.Nm Strip
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has not been widely tested on a variety of lower-level tty drivers.
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.P
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The detection and resetting of radios that crash out of Starmode does
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not always work in this version of the driver. One workaround
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is to kill the
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.Xr slattach
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process, ifconfig the
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.Nm strip
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interface down, and then starti a new slattach and rerun ifconfig.
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.Sh HISTORY
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.Nm Strip
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was originally developed for the Linux kernel by Stuart
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Cheshire of Stanford's Operating Systems and Networking group,
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as part of Mary Baker's MosquitoNet
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.Sy http://mosquitonet.stanford.edu/mosquitonet.html
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project.
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This
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.Nm strip
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driver was ported to BSD by Jonathan Stone at Stanford's Distributed
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Systems Group and first distributed with NetBSD 1.2.
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