180 lines
6.3 KiB
Groff
180 lines
6.3 KiB
Groff
.\" Copyright (c) 1986, 1991 The Regents of the University of California.
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.\" All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\" 3. All advertising materials mentioning features or use of this software
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.\" must display the following acknowledgement:
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.\" This product includes software developed by the University of
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.\" California, Berkeley and its contributors.
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.\" 4. Neither the name of the University nor the names of its contributors
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.\" may be used to endorse or promote products derived from this software
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.\" without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" @(#)slattach.8 6.4 (Berkeley) 3/16/91
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.\"
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.\" $Header: /a/cvs/386BSD/src/sbin/slattach/slattach.8,v 1.6 1993/09/15 21:18:07 jkh Exp $
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.\"
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.Dd April 4, 1993
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.Dt SLATTACH 8
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.Os BSD 4.3
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.Sh NAME
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.Nm slattach
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.Nd attach serial lines as network interfaces
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.Sh SYNOPSIS
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.Nm Slattach
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.Op \-a
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.Op \-c
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.Op \-e exit-command
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.Op \-f
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.Op \-h
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.Op \-l
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.Op \-n
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.Op \-r redial-command
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.Op \-s baudrate
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.Op \-u unit-command
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.Op \-z
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.Ar ttyname
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.Sh DESCRIPTION
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.Nm Slattach
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is used to assign a tty line to a network interface,
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and to define the network source and destination addresses.
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The following operands are supported by
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.Nm slattach :
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.Bl -tag -width Ar
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.It Ar \-a
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Autoenable the VJ header compression option, if the other end of the link
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is capable of VJ header compression then it will be used otherwise normal
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headers will be used.
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.It Ar \-c
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Enables the VJ header compression option. Note that both ends of the link
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must be able to use VJ header compression for this to work.
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.It Ar \-e exit-command
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Specifies a command to be invoked within a shell (sh -c exit-command)
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before slattach exits.
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.It Ar \-f
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Disables the invocation of daemon() to run slattach in the background.
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.It Ar \-h
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Turn on cts/rts style flow control on the slip port, by default no flow
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control is done.
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.It Ar \-l
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disable modem control (CLOCAL) and ignore carrier detect on the slip
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port. By default the redial-command is invoked upon carrier drop and
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slattach aborts if no redial-command is specified.
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.It Ar \-n
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Throw away ICMP packets. The slip interface will ignore ICMP packets
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to prevent slow lines being saturated by ICMP responses.
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.It Ar \-r redial-command
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Specifies a command to be invoked within a shell (sh -c
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redial-command) whenever carrier is lost on the line.
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.It Ar \-s baudrate
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Specifies the speed of the connection. If not specified, the
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default of 9600 is used.
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.It Ar \-u unit-command
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When the line is switched to slip discipline, run
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.Ql sh \-c unit-command <last> <current>
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where <last> and <current> are the slip unit numbers when the line was
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last opened and the unit number of the current slip connection
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respecitvely. The unit number can change after redialing if you are
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using more than one slip line. Slattach will abort if the unit number
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changes and
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.Ql \-u unit-command
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was not specified.
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.It Ar \-z
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forces redial
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redial-cmd upon startup irrespective of carrier.
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.It Ar ttyname
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Specifies the name of the tty device.
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.Ar Ttyname
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should be a string of the form
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.Ql ttyXX or
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.Ql /dev/ttyXX.
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.El
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.Pp
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Only the super-user may attach a network interface.
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.Pp
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To detach the interface, use
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.Dq Li ifconfig interface-name down
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after killing off the
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.Nm slattach
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process using
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.Ql kill -INT .
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.Ar Interface-name
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is the name that is shown by
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.Xr netstat 1
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.Pp
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To setup slattach to redial the phone when carrier is lost, use the
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.Ql \-r redial-cmd
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option to specify a script or executable that will reconnect the
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serial line to the slip server. For example, the script could redial
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the server and log in, etc.
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.Pp
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To reconfigure the network interface in case the slip unit number
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changes, use the
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.Ql \-u unit-cmd
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option to specify a script or executable that will be invoked as
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.Ql sh \-c unit-cmd old new,
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where old and new are the slip unit numbers before and after
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reconnecting the line. The unit number can change if you have more
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than one line disconnect at the same time. The first to succeed in
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reconnecting will get the lowest unit number.
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.Pp
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To kill slattach use
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.Ql kill -INT
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(SIGINT) which causes it to close the tty and exit.
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.Pp
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To force a redial, use
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.Ql kill -HUP
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(SIGHUP) which causes slattach to think carrier was lost and thus invoke
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.Ql sh -c redial-command
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to reconnect to the server.
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.Pp
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If you use a hard-wired connection rather than a modem, invoke
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slattach with the
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.Ql \-l
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option in order to ignore carrier on the slip line.
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.Sh EXAMPLES
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.Bd -literal -offset indent -compact
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slattach ttyh8
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slattach \-s 4800 /dev/tty01
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slattach \-c \-s 38400 /dev/sio01
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slattach \-r 'kermit -y dial.script >kermit.log 2>&1'
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.Ed
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.Sh DIAGNOSTICS
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Look for error messages in /var/log/messages (slattach is a daemon).
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Messages indicating the specified interface does not exit, the
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requested address is unknown, the user is not privileged and tried to
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alter an interface's configuration are logged there. Slattach also
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logs failure to set the controlling terminal or failure to install
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signal handlers. Upon connection and redial the ttyname and baud rate
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are logged and on shutdown the ttyname is logged.
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.Pp
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.Sh SEE ALSO
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.Xr netstat 1 ,
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.Xr netintro 4 ,
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.Xr ifconfig 8 ,
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.Xr rc 8
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.Sh HISTORY
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The
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.Nm
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command appeared in
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.Bx 4.3 .
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