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startslip(8)


NAME

  startslip - Configures SLIP connections


SYNOPSIS

  /usr/sbin/startslip [-i filename]


OPTIONS

  -i filename
      Specifies the file containing the startslip subcommands for dial-out
      connections.


DESCRIPTION

  The startslip program configures two types of SLIP connections:

    ·  Dial-in connections -- The system is to answer calls from remote
       systems.

    ·  Dial-out connections -- The system is to place calls to a remote
       system.

  Dial-in Connections

  If your system is configured as a dial-in system, a getty process is
  continuously run on the serial line that is connected to a modem.  When a
  call comes in, getty prompts for a login name.  If the login name matches a
  SLIP user name entry in the /etc/passwd file, getty starts startslip as a
  login shell.	The startslip program then reads the /etc/slhosts files until
  it finds an entry matching the current login name.  If an entry is found,
  startslip configures the tty line as a SLIP link using information in the
  slhosts file entry.

  See Network Administration: Connections for information on setting up your
  system as a SLIP dial-in system.

  Dial-out Connections

  If your system is configured as a dial-out system and you want to create a
  SLIP connection to a remote system, you invoke the startslip program from
  the command line and specify -i filename.  The filename file contains the
  startslip subcommands to set up the dial-out connection (see the
  Subcommands section). After making the connection, startslip runs in the
  background.

  When you are finished with the SLIP connection, you can either turn off
  your modem or kill the tty process.  The tty process ID is stored in the
  /var/run/ttyxx.tel-pid file, where ttyxx specifies the terminal line.

  Subcommands

  The following startslip subcommands can be used to set up SLIP dial-out
  connections.	The subcommands are specified in a SLIP setup script file
  that is passed to startslip with the -i filename option.  In the setup
  script file, any text following the comment character (#) is ignored.	 In
  addition, each line can contain up to 256 characters.

  callback
      Specifies the callback option.  If this subcommand is specified,
      startslip raises Data Terminal Ready (DTR) if carrier is lost during a
      read from the serial line.

  connslip
      Causes startslip to configure the network interface with the values
      specified with the myip, dstip, and netmask subcommands, and to attach
      the serial line to the network interface.	 If the gateway is specified,
      it also adds the destination IP address as the default gateway.

      Specify this subcommand at the end of the script file.  Specify the
      myip, dstip, netmask, and, optionally, gateway subcommands prior to
      connslip.

  debug logfile
      Enables debugging and prints debug messages to the logfile file.
      Specify this subcommand at the beginning of the script file.

  dial telephone_number
      Dials the telephone_number.  The format of telephone_number is a string
      of numbers with no separators.  Specify this subcommand after opentty
      and modemtype.

  dstip hostname | IP address
      Sets destination IP address.  You can specify either a host name or IP
      address.

  exit
      Terminates startslip and exits.

  expect string timeout seconds errmsg message
      Causes startslip to wait to receive string from the remote host.	If a
      match occurs, startslip continues reading this file.  If a match does
      not occur after the specified seconds, startslip prints message and
      exits.

      Specify this subcommand after opentty.

  flush
      Flushes the read and write queues.

  gateway
      Sets the destination IP address as the default gateway.

  hardwired
      Specifies a hard-wired link.  Ignore modem control signals (CLOCAL flag
      set in termios structure) when switching to a SLIP connection.

  icmpsup
      Enables ICMP traffic suppression.

  modemtype modem_name
      Sets the modem type.  The modem_name specified must be defined in the
      /etc/acucap file.

  myip hostname | IP address
      Sets my local IP address.	 You can specify either a host name or IP
      address.

  netmask
      Sets the network mask.

  opentty ttyxx speed baud_rate
      Opens the ttyxx serial line and sets line speed to baud_rate.  The
      value for baud_rate must be one of the standard speeds listed in
      </usr/include/sys/termios.h>.

  printmsg string
      Prints string to the standard output; everything to the end of the
      line, including punctuation, is printed.	Use this subcommand to cue
      the user as to which subcommand is executing.

  raddr myip | dstip | netmask
      Causes startslip to read either the local IP address, destination IP
      address, or network mask from the remote system in dotted decimal
      notation. Use this subcommand after opentty.  An expect subcommand
      should be used prior to raddr ensure that the desired information is
      read.

  send string
      Sends the string to the serial line.  Use this subcommand after
      opentty.

      If string is set to the keyword ASKPASSWD, startslip prompts for a
      password, reads it from standard input, and sends it to the serial
      line.

  sleep number_of_seconds
      Causes startslip to sleep number_of_seconds before continuing to read
      subcommands.

  status
      Displays current status of startslip.

  tcpcomp
      Enables TCP header compression.

  tcpauto
      Enables automatic TCP header compression.


RESTRICTIONS

  Only a person with superuser authority can run the startslip program.


EXAMPLES

  The following sample setup script file shows how to use various startslip
  dial-out subcommands.

       debug /tmp/debuglog

       myip 27.140.208.38

       dstip 27.140.208.40

       netmask 255.255.255.0

       # set modemtype before dialing
       # microcom modem attributes defined in /etc/acucap
       modemtype microcom

       printmsg open /dev/tty00 at speed 38400
       opentty tty00 speed 38400

       printmsg dial 18154231234
       dial 18154231234

       # expect login prompt. timeout and exit after 5 seconds.
       expect ogin: timeout 5 errmsg "not getting login: prompt"

       printmsg send login
       send sliplogin

       # expect password prompt. timeout and exit after 5 seconds.
       expect assword: timeout 5 errmsg "not getting Password: prompt"

       printmsg Prompt and send password
       send ASKPASSWD

       # expect Starting SLIP after login
       expect SLIP timeout 10 errmsg "not getting startup message"

       # connect slip - ifconfig, slattach
       printmsg connect slip
       connslip


FILES

  /usr/sbin/startslip
      Specifies the command path

  /var/run/ttyxx.tel-pid
      Contains the startslip process ID

  </usr/include/termios.h>
      Specifies the termios header file


SEE ALSO

  Commands: ifconfig(8)

  Files: acucap(4), slhosts(4)

  Network Administration: Connections

  Specifications: A Nonstandard for Transmission of IP Datagrams Over Serial
  Lines: SLIP (RFC1055)

  Compressing TCP/IP Headers for Low-speed Serial Links (RFC1144)

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