.\" manual page [] for pppd 2.3
-.\" $Id: pppd.8,v 1.27 1998/03/31 04:31:08 paulus Exp $
+.\" $Id: pppd.8,v 1.30 1998/11/07 06:59:29 paulus Exp $
.\" SH section heading
.\" SS subsection heading
.\" LP paragraph
option is privileged if the \fInoauth\fR option is used.
.TP
.B crtscts
-Use hardware flow control (i.e. RTS/CTS) to control the flow of data
-on the serial port. If neither the \fIcrtscts\fR nor the
-\fInocrtscts\fR option is given, the hardware flow control setting
-for the serial port is left unchanged.
+Use hardware flow control (i.e. RTS/CTS) to control the flow of
+data on the serial port. If neither the \fIcrtscts\fR, the
+\fInocrtscts\fR, the \fIcdtrcts\fR nor the \fInocdtrcts\fR option
+is given, the hardware flow control setting for the serial port is
+left unchanged.
+Some serial ports (such as Macintosh serial ports) lack a true
+RTS output. Such serial ports use this mode to implement
+unidirectional flow control. The serial port will
+suspend transmission when requested by the modem (via CTS)
+but will be unable to request the modem stop sending to the
+computer. This mode retains the ability to use DTR as
+a modem control line.
+.TP
+.B cdtrcts
+Use a non-standard hardware flow control (i.e. DTR/CTS) to control
+the flow of data on the serial port. If neither the \fIcrtscts\fR,
+the \fInocrtscts\fR, the \fIcdtrcts\fR nor the \fInocdtrcts\fR
+option is given, the hardware flow control setting for the serial
+port is left unchanged.
+Some serial ports (such as Macintosh serial ports) lack a true
+RTS output. Such serial ports use this mode to implement true
+bi-directional flow control. The sacrifice is that this flow
+control mode does not permit using DTR as a modem control line.
.TP
.B defaultroute
Add a default route to the system routing tables, using the peer as
requests from pppd for CCP negotiation.
.TP
.B nocrtscts
-Disable hardware flow control (i.e. RTS/CTS) on the serial port. If
-neither the \fIcrtscts\fR nor the \fInocrtscts\fR option is given,
-the hardware flow control setting for the serial port is left
-unchanged.
+Disable hardware flow control (i.e. RTS/CTS) on the serial port.
+If neither the \fIcrtscts\fR nor the \fInocrtscts\fR nor the
+\fIcdtrcts\fR nor the \fInodtrcts\fR option is given, the hardware
+flow control setting for the serial port is left unchanged.
+.TP
+.B nodtrcts
+This option is a synonym for \fInocrtscts\fR. Either of these options will
+disable both forms of hardware flow control.
.TP
.B nodefaultroute
Disable the \fIdefaultroute\fR option. The system administrator who
.B SPEED
The baud rate of the tty device.
.TP
-.B UID
+.B ORIG_UID
The real user-id of the user who invoked pppd.
.P
Pppd invokes the following scripts, if they exist. It is not an error