| 1 | .TH SLIP 8
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| 2 | .SH NAME
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| 3 | slip \- Serial Line IP
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| 4 | .SH SYNOPSIS
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| 5 | .B slip
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| 6 | .I pseudo-ip-device
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| 7 | .SH DESCRIPTION
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| 8 | .de SP
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| 9 | .if t .sp 0.4
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| 10 | .if n .sp
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| 11 | ..
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| 12 | The
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| 13 | .B slip
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| 14 | program implements an Internet network connection over a bidirectional 8-bit
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| 15 | transport, usually a serial line. The protocol used for this connection is
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| 16 | the Serial Line Internet Protocol, SLIP for short.
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| 17 | .PP
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| 18 | The
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| 19 | .I pseudo-ip-device
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| 20 | argument names one of the
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| 21 | .B /dev/psip*
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| 22 | devices that is offered by the MINIX 3 TCP/IP driver
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| 23 | .BR inet (8).
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| 24 | The
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| 25 | .B slip
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| 26 | program reads IP packets from standard input and writes them to the pseudo
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| 27 | IP device, and reads packets from the pseudo IP device and writes them to
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| 28 | standard output. A typical use is like this:
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| 29 | .PP
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| 30 | .RS
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| 31 | .nf
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| 32 | .ft B
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| 33 | {
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| 34 | stty raw 115200
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| 35 | slip /dev/psip2 &
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| 36 | } </dev/tty01 >/dev/tty01
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| 37 | .ft P
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| 38 | .fi
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| 39 | .RE
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| 40 | .PP
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| 41 | The SLIP protocol is just a very simple packet framing protocol. It defines
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| 42 | two characters as markers on a byte stream to frame packets. SLIP does
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| 43 | not implement any higher level addressing, error detection, or compression.
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| 44 | Thanks to its simplicity it can be used under MINIX 3, any other system would
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| 45 | prefer to use the Point-to-Point protocol: PPP.
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| 46 | .PP
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| 47 | The SLIP packet framing protocol as defined in RFC-1055 is as follows:
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| 48 | .IP "\-"
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| 49 | Packets are delimited by an END character, octal 300. END is often send at
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| 50 | the start of a packet too to reset the logic of the receiver, so that random
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| 51 | noise isn't added to the beginning of a packet.
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| 52 | .IP "\-"
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| 53 | An ESC character (octal 333) is used to escape any END or ESC characters
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| 54 | that may occur in an IP packet. END and ESC are changed to ESC 334 and ESC
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| 55 | 335 in the data stream. (Note that END doesn't occur within the data stream
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| 56 | at all by escaping it this way, making finding the framing END easier.)
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| 57 | .ig
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| 58 | .PP
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| 59 | The manual page
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| 60 | .BR serial-ip (8)
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| 61 | describes how to configure the MINIX 3 network devices to be used with a
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| 62 | serial IP connection.
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| 63 | ..
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| 64 | .SH FILES
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| 65 | .TP \w'/dev/psip*'u+5n
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| 66 | .B /dev/psip*
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| 67 | Pseudo-IP devices for use by
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| 68 | .BR slip .
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| 69 | .SH "SEE ALSO"
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| 70 | .ig
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| 71 | .BR ppp (8).
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| 72 | .br
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| 73 | ..
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| 74 | .BR RFC-1055 .
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| 75 | .SH NOTES
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| 76 | Under MINIX 3
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| 77 | .B slip
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| 78 | forks in two to handle the two data streams in or out of the serial line.
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| 79 | Under Minix-vmd it uses asynchronous I/O to handle the two streams within
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| 80 | one program.
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| 81 | .SH AUTHOR
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| 82 | Kees J. Bot <kjb@cs.vu.nl>
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