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NetBSD 6.1.5 - man page for strip (netbsd section 4)

STRIP(4)			   BSD Kernel Interfaces Manual 			 STRIP(4)

     strip -- Metricom Ricochet packet radio wireless network device

     pseudo-device strip

     The strip driver takes outbound network packets, encapsulates them using the Metricom "star
     mode" framing, and sends the packets out an RS-232 interface to a Metricom Ricochet packet
     radio.  Packets arriving from the packet radio via the serial link are decapsulated and then
     passed up to the local host's networking stack.

     strip is an acronym for STarmode Radio IP.

     The strip interfaces can be created by using the ifconfig(8) create command.  Each strip
     interface is a pseudo-device driver for the Metricom Ricochet packet radio, operating in
     peer-to-peer packet mode.

     In many ways, the strip driver is very much like the sl(4) SLIP pseudo-device driver.  A
     strip device is attached to a tty line with slattach(8).  Once attached, the interface is
     configured via ifconfig(8).  The major difference between the sl(4) SLIP pseudo-device
     driver and the strip driver is that SLIP works only between two hosts over a dedicated
     point-to-point connection.

     In contrast, strip sends packets to a frequency-hopping packet radio, which can address
     packets to any peer Metricom Ricochet packet radio, rather than just to a single host at the
     other end of a point-to-point line.  Thus, one strip pseudo-device is usually sufficient for
     any kernel.

     In other respects, a strip 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 compati-
     ble with Ethernet.  Broadcast or multicast to more than one packet radio is not possible,
     due to the independent frequency-hopping operation of the packet radios.  The interface
     flags IFF_POINTOPOINT and IFF_BROADCAST are not supported on the strip interface.

     In other words, strip implements a multiple-access, non-broadcast device, accessed via an
     RS-232 serial line, using a proprietary packet framing scheme.

     This version of the strip driver maps IP addresses to Metricom Ricochet packet radio
     addresses using statically configured entries in the normal routing table.  These entries
     map IP addresses of peer packet 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 arp(4) to obtain the IP address of reachable peer packet radios dynamically.

     This version of the STRIP driver requires static pre-configuration of the mapping from IP
     addresses to packet radio MAC addresses.  The route(8) command should be used to bind a peer
     STRIP host's packet radio IP address to the peer's link-level packet radio address.

     Radio addresses are encoded using the hex equivalent of the packet radio's decimal ASCII
     address.  For example, the following route command will configure a routing entry to a
     packet radio with a MAC address of 1234-5678, and an IP address, reachable via
     the strip0 interface:

	   route add -host -link strip0:1:2:3:4:5:6:7:8

     Generalising from this example to other IP addresses and to other 8-digit MAC addresses
     should be clear.

     The Metricom Ricochet packet radios can auto-baud at speeds up to 38.4K baud.  At higher
     speeds -- 57600 or 115200 -- the packet radio cannot autobaud.  When running at high speeds,
     the packet radio's serial port should be manually configured to permanently run at the
     desired speed.  Use a terminal emulator and the Hayes command ATS304=115200 to set the
     serial baudrate to the specified number (or 0 for autobaud).  The command AT&W will then
     save the current packet radio state in non-volatile memory.

     Metricom Ricochet packet radios can operate in either ``modem-emulation'' mode or in packet
     mode (i.e.  "star mode").	The strip driver automatically detects if the packet radio has
     fallen out of "star mode", and resets it back into "star mode", if the baud rate was set
     correctly by slattach(8).

     arp(4), inet(4), sl(4), ifconfig(8), route(8), slattach(8)

     strip was originally developed for the Linux kernel by Stuart Cheshire of Stanford's Operat-
     ing Systems and Networking group, as part of Mary Baker's MosquitoNet
     http://mosquitonet.stanford.edu/mosquitonet.html project.

     This strip driver was ported to NetBSD by Jonathan Stone at Stanford's Distributed Systems
     Group and first distributed with NetBSD 1.2.

     Currently, strip is IP-only.  Encapsulations for AppleTalk and ARP have been defined, but
     are not yet implemented in this driver.

     strip has not been widely tested on a variety of lower-level serial drivers.

     The detection and resetting of packet radios that crash out of "star mode" does not always
     work in this version of the driver.  One workaround is to kill the slattach(8) process,
     ifconfig(8) the strip interface down, and then start a new slattach and rerun ifconfig to
     enable the interface again.

BSD					 December 5, 2004				      BSD

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