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