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-.\"	$OpenBSD: strip.4,v 1.24 2008/01/06 18:40:24 jmc Exp $
-.\"
-.\" Copyright 1996 The Board of Trustees of The Leland Stanford
-.\" Junior University. All Rights Reserved.
-.\"
-.\" Author: Jonathan Stone
-.\"
-.\" Permission to use, copy, modify, and distribute this
-.\" software and its documentation for any purpose and without
-.\" fee is hereby granted, provided that the above copyright
-.\" notice and the above authorship notice appear in all copies.
-.\" Stanford University makes no representations about the suitability
-.\" of this software for any purpose.  It is provided "as is" without
-.\" express or implied warranty.
-.Dd $Mdocdate: January 6 2008 $
-.Dt STRIP 4
-.Os
-.Sh NAME
-.Nm strip
-.Nd packet-mode network device driver for the Metricom Ricochet radio
-.Sh SYNOPSIS
-.Cd "pseudo-device strip" Op Ar count
-.Sh DESCRIPTION
-Configures
-.Ar count
-.Nm
-interfaces, named
-.Sy st Ns Ar 0 ,
-.Sy st Ns Ar 1 ,
-etc., into a kernel built from a config file containing the
-given entry.
-.Pp
-Each
-.Nm
-interface is a pseudo-device driver for the Metricom Ricochet radio,
-operating in peer-to-peer packet mode.
-.Pp
-The
-.Nm
-driver takes outbound network packets, encapsulates them using the
-Metricom "starmode" framing, and sends the packets out an RS-232
-interface to a Metricom
-.Em Ricochet
-radio.
-Packets arriving from the radio via the serial link are decapsulated and then
-passed up to the local host's networking stack.
-.Pp
-.Nm
-is an acronym for
-.Sy \&St Ns armode
-.Sy R Ns adio
-.Sy IP .
-.Pp
-In many ways,
-the
-.Nm
-driver is very much like the
-.Nm sl
-SLIP pseudo-device driver.
-A
-.Nm
-device is attached to a tty line with
-.Xr ldattach 8 .
-Once attached, the interface is configured via
-.Xr ifconfig 8 .
-The major difference between the
-.Xr sl 4
-SLIP pseudo-device driver and the
-.Nm
-driver is that SLIP works only between two hosts over
-a dedicated point-to-point connection.
-In contrast,
-.Nm
-sends
-packets to a frequency-hopping radio, which can address packets to
-any peer Metricom radio rather than just to a single host at the
-other end of a point-to-point line.
-Thus, one
-.Nm
-pseudo-device is usually sufficient for any kernel.
-.Pp
-In other respects, a
-.Nm
-interface is rather like an Ethernet interface.
-Packets are individually addressed, and subsequent packets can
-be sent independently to different MAC addresses.
-However, the "Star-mode" framing and MAC addressing are not in any way
-compatible with Ethernet.
-Broadcast or multicast to more than one radio is not possible, due to the
-independent frequency-hopping operation of the radios.
-The interface flags
-.Dv IFF_POINTOPOINT
-and
-.Dv IFF_BROADCAST
-are not supported on
-.Nm
-interface.
-.Pp
-In other words,
-.Nm
-implements a multiple-access, non-broadcast device, accessed via
-an RS-232 serial line, using a proprietary packet framing scheme.
-.Pp
-This version
-.Nm
-driver maps IP addresses to Metricom radio addresses using
-statically configured entries in the normal routing table.
-These entries map IP addresses of peer radios to the MAC-level addresses.
-The exact syntax of this mapping and an example are discussed below.
-The Internet Assigned Numbers Authority (IANA) has allocated an ARP
-type code for use with STRIP.
-A future version of this driver will support
-.Xr arp 4
-to obtain the IP address of reachable peer radios dynamically.
-.Sh ADDRESS CONFIGURATION
-This version of the
-.Nm
-driver requires static pre-configuration of
-the mapping from IP addresses to radio MAC addresses.
-The
-.Xr route 8
-command should be used to bind a peer STRIP host's radio IP address
-to the peer's link-level radio address.
-Radio addresses are encoded using the hex equivalent of the radio's
-decimal ASCII address.
-For example, the following route command will
-configure a routing entry to a radio with a MAC address of 1234-5678,
-and an IP address 10.11.12.13:
-.Pp
-.Dl "# route add -host 10.11.12.13 -link 1:2:3:4:5:6:7:8"
-.Pp
-Generalising from this example to other IP addresses and to other 8-digit MAC addresses
-should be clear.
-.Sh RADIO CONFIGURATION
-The Metricom radios can auto-baud at speeds up to 38.4k baud.
-At higher speeds \(em 57600 or 115200 \(em the radio cannot autobaud.
-When running at high speeds, the radio's serial port should be
-manually configured to permanently run at the desired speed.
-Use a terminal emulator and the Hayes command
-.Em ATS304=115200
-to set the serial baudrate to the specified number (or 0 for autobaud).
-The command
-.Em AT&w
-will then save the current radio state in non-volatile memory.
-.Pp
-Metricom radios can operate in either "modem-emulation" mode
-or in packet mode (Starmode).
-The
-.Nm
-driver automatically detects if the radio has fallen out of starmode,
-and resets it back into starmode, if the baud rate was set correctly
-by
-.Xr ldattach 8 .
-.\" .Sh DIAGNOSTICS
-.Sh SEE ALSO
-.Xr arp 4 ,
-.Xr inet 4 ,
-.Xr ldattach 8 ,
-.Xr route 8 ,
-.Xr slip 8
-.Sh HISTORY
-.Nm
-was originally developed for the Linux kernel by Stuart
-Cheshire of Stanford's Operating Systems and Networking group,
-as part of Mary Baker's MosquitoNet
-.Sy http://mosquitonet.stanford.edu/mosquitonet.html
-project.
-This
-.Nm
-driver was ported to BSD by Jonathan Stone at Stanford's Distributed
-Systems Group and first distributed with
-.Nx 1.2 .
-.Sh BUGS
-Currently is IP-only.
-Encapsulations for AppleTalk and ARP have been defined,
-but are not yet implemented in this driver.
-.Pp
-.Nm
-has not been widely tested on a variety of lower-level tty drivers.
-.P
-The detection and resetting of radios that crash out of Starmode does
-not always work in this version of the driver.
-One workaround is to kill the
-.Xr ldattach 8
-process, ifconfig the
-.Nm
-interface down, and then start a new ldattach and rerun ifconfig.