2005-05-02 15:01:42 +02:00
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.TH SLIP 8
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.SH NAME
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slip \- Serial Line IP
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.SH SYNOPSIS
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.B slip
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.I pseudo-ip-device
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.SH DESCRIPTION
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.de SP
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.if t .sp 0.4
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.if n .sp
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..
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The
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.B slip
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program implements an Internet network connection over a bidirectional 8-bit
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transport, usually a serial line. The protocol used for this connection is
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the Serial Line Internet Protocol, SLIP for short.
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.PP
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The
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.I pseudo-ip-device
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argument names one of the
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.B /dev/psip*
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2005-08-22 14:56:02 +02:00
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devices that is offered by the MINIX 3 TCP/IP driver
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.BR inet (8).
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The
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.B slip
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program reads IP packets from standard input and writes them to the pseudo
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IP device, and reads packets from the pseudo IP device and writes them to
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standard output. A typical use is like this:
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.PP
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.RS
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.nf
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.ft B
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{
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stty raw 115200
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slip /dev/psip2 &
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} </dev/tty01 >/dev/tty01
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.ft P
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.fi
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.RE
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.PP
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The SLIP protocol is just a very simple packet framing protocol. It defines
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two characters as markers on a byte stream to frame packets. SLIP does
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not implement any higher level addressing, error detection, or compression.
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2005-08-22 14:56:02 +02:00
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Thanks to its simplicity it can be used under MINIX 3, any other system would
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prefer to use the Point-to-Point protocol: PPP.
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.PP
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The SLIP packet framing protocol as defined in RFC-1055 is as follows:
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.IP "\-"
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Packets are delimited by an END character, octal 300. END is often send at
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the start of a packet too to reset the logic of the receiver, so that random
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noise isn't added to the beginning of a packet.
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.IP "\-"
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An ESC character (octal 333) is used to escape any END or ESC characters
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that may occur in an IP packet. END and ESC are changed to ESC 334 and ESC
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335 in the data stream. (Note that END doesn't occur within the data stream
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at all by escaping it this way, making finding the framing END easier.)
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.ig
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.PP
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The manual page
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.BR serial-ip (8)
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describes how to configure the MINIX 3 network devices to be used with a
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serial IP connection.
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..
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.SH FILES
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.TP \w'/dev/psip*'u+5n
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.B /dev/psip*
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Pseudo-IP devices for use by
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.BR slip .
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.SH "SEE ALSO"
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.ig
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.BR ppp (8).
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.br
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..
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.BR RFC-1055 .
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.SH NOTES
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2005-08-22 14:56:02 +02:00
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Under MINIX 3
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2005-05-02 15:01:42 +02:00
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.B slip
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forks in two to handle the two data streams in or out of the serial line.
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Under Minix-vmd it uses asynchronous I/O to handle the two streams within
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one program.
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.SH AUTHOR
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Kees J. Bot <kjb@cs.vu.nl>
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