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SLIP(8)                     System Manager's Manual                    SLIP(8)

NAME
       slip - Serial Line IP

SYNOPSIS
       slip pseudo-ip-device

DESCRIPTION
       The  slip  program  implements  an  Internet  network connection over a
       bidirectional 8-bit transport, usually a  serial  line.   The  protocol
       used for this connection is the Serial Line Internet Protocol, SLIP for
       short.

       The pseudo-ip-device argument names one of the /dev/psip* devices  that
       is  offered  by  the  MINIX  3 TCP/IP driver inet(8).  The slip program
       reads IP packets from standard input and writes them to the  pseudo  IP
       device,  and reads packets from the pseudo IP device and writes them to
       standard output.  A typical use is like this:

              {
                   stty raw 115200
                   slip /dev/psip2 &
              } </dev/tty01 >/dev/tty01

       The SLIP protocol is just a very simple packet  framing  protocol.   It
       defines  two  characters  as markers on a byte stream to frame packets.
       SLIP does not implement any higher level addressing,  error  detection,
       or compression.  Thanks to its simplicity it can be used under MINIX 3,
       any other system would prefer to use the Point-to-Point protocol: PPP.

       The SLIP packet framing protocol as defined in RFC-1055 is as follows:

       -      Packets are delimited by an END character, octal  300.   END  is
              often  send  at  the start of a packet too to reset the logic of
              the receiver, so that random noise isn't added to the  beginning
              of a packet.

       -      An  ESC  character  (octal 333) is used to escape any END or ESC
              characters that may occur in an IP  packet.   END  and  ESC  are
              changed  to  ESC 334 and ESC 335 in the data stream.  (Note that
              END doesn't occur within the data stream at all by  escaping  it
              this way, making finding the framing END easier.)

FILES
       /dev/psip*     Pseudo-IP devices for use by slip.

SEE ALSO
       RFC-1055.

NOTES
       Under  MINIX  3  slip forks in two to handle the two data streams in or
       out of the serial line.  Under Minix-vmd it uses  asynchronous  I/O  to
       handle the two streams within one program.

AUTHOR
       Kees J. Bot <kjb@cs.vu.nl>

                                                                       SLIP(8)
NAME | SYNOPSIS | DESCRIPTION | FILES | SEE ALSO | NOTES | AUTHOR