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32 .\" @(#)slattach.8 6.4 (Berkeley) 3/16/91
34 .\" $FreeBSD: src/sbin/slattach/slattach.8,v 1.16.2.6 2003/02/23 21:17:43 trhodes Exp $
41 .Nd attach serial lines as network interfaces
46 .Op Fl e Ar exit-command
53 .Op Fl r Ar redial-command
55 .Op Fl u Ar unit-command
63 utility is used to assign a tty line to a network interface,
64 and to define the network source and destination addresses.
66 The following options are available:
67 .Bl -tag -width indent
69 Autoenable the VJ header compression option, if the other end of the link
70 is capable of VJ header compression then it will be used otherwise normal
73 Enable the VJ header compression option. Note that both ends of the link
74 must be able to use VJ header compression for this to work.
75 .It Fl e Ar exit-command
76 Specify a command to be invoked within a shell
77 .Ql sh \-c Ar exit-command
82 Disable the invocation of daemon() to run
86 Turn on cts/rts style flow control on the slip port, by default no flow
89 Disable modem control (CLOCAL) and ignore carrier detect on the slip
92 is invoked upon carrier drop and
98 Throw away ICMP packets. The slip interface will ignore ICMP packets
99 to prevent slow lines being saturated by ICMP responses.
100 .It Fl r Ar redial-command
101 Specify a command to be invoked within a shell
102 .Ql sh \-c Ar redial-command
103 whenever carrier is lost on the modem line.
108 cause connection reestablishing on leased line
109 without any external command invoked.
111 Specify the speed of the connection.
112 If not specified, the
113 default of 9600 is used.
114 .It Fl u Ar unit-command
115 When the line is switched to slip discipline, run
116 .Dq Nm "sh -c" Ar unit-command old new
121 are the slip unit numbers when the line was
122 last opened and the unit number of the current slip connection
123 respectively. The unit number can change after redialing if you are
124 using more than one slip line.
127 is connected for the first time,
128 .Dq Nm "sh -c" Ar unit-command \-1 new
133 .Dq Nm "sh -c" Ar unit-command old \-1
137 utility will abort if the unit number
139 .Dq Fl u Ar \%unit-command
144 upon startup irrespective of carrier.
146 Use uucp-style device locking.
147 You need it unless you start
149 from external program which already does uucp locking.
150 Default case is no uucp locking to satisfy such programs.
151 .It Fl K Ar keepalive
152 Set SLIP "keep alive" timeout in seconds.
153 If FRAME_END is not received in
154 this amount of time, re-connect occurs.
155 The default value is no timeout.
157 Set SLIP "out fill" timeout in seconds. It forces at least one FRAME_END
158 to be sent during this time period, which is necessary for the "keep alive"
159 timeout on the remote side.
160 The default value is no timeout.
162 Set the SLIP unit number directly.
163 Use with caution, because no check is made
164 for two interfaces with same number.
165 By default sliplogin dynamically assigns the unit number.
167 Specify the name of the tty device.
169 should be a string of the form
175 Only the super-user may attach a network interface.
177 To detach the interface, use
178 .Dq Li ifconfig interface-name down
179 after killing off the
184 is the name that is shown by
189 to redial the phone when carrier is lost, use the
190 .Fl r Ar redial-command
191 option to specify a script or executable that will reconnect the
192 serial line to the slip server. For example, the script could redial
193 the server and log in, etc.
195 To reconfigure the network interface in case the slip unit number
197 .Fl u Ar unit-command
198 option to specify a script or executable that will be invoked as
199 .Ql sh \-c Ar unit-command old new
204 are the slip unit numbers before and after
205 reconnecting the line. The unit number can change if you have more
206 than one line disconnect at the same time. The first to succeed in
207 reconnecting will get the lowest unit number.
213 (SIGINT) which causes it to close the tty and exit.
215 To force a redial, use
217 (SIGHUP) which causes
219 to think carrier was lost and thus invoke
220 .Ql sh \-c Ar redial-command
221 to reconnect to the server.
223 If you use a hard-wired connection rather than a modem, invoke
227 option in order to ignore carrier on the slip line.
229 .Bd -literal -offset indent -compact
231 slattach \-s 4800 /dev/ttyd1
232 slattach \-c \-s 38400 /dev/cuaa1
233 slattach \-r 'kermit -y dial.script >kermit.log 2>&1'
236 Look for error messages in
237 .Pa /var/log/messages
240 Messages indicating the specified interface does not exit, the
241 requested address is unknown, the user is not privileged and tried to
242 alter an interface's configuration are logged there.
246 also logs failure to set the controlling terminal or failure to install
247 signal handlers. Upon connection and redial the ttyname and baud rate
248 are logged and on shutdown the ttyname is logged.
250 .Bl -tag -width /usr/share/examples/slattach/* -compact
251 .It Pa /var/run/slattach.<tty>.pid
254 replaced by the terminal path name component of
256 This file contains the numerical process ID of the
258 process and can be examined by scripts in order to send a signal to
260 .It Pa /usr/share/examples/slattach/*