document xonxoff/-crtscts and lcp-echo-* options

and ip-up/down scripts.

diff --git a/pppd/pppd.8 b/pppd/pppd.8
index 032eeb09cc14b34a04a37e2b585531d58130114d..4c9819792b21af1b423500846acaeb464fec23c0 100644 (file)
--- a/pppd/pppd.8
+++ b/pppd/pppd.8
@@ -1,5 +1,5 @@
 .\" manual page [] for pppd 2.0
-.\" $Id: pppd.8,v 1.4 1994/05/09 02:40:39 paulus Exp $
+.\" $Id: pppd.8,v 1.5 1994/05/24 11:27:08 paulus Exp $
 .\" SH section heading
 .\" SS subsection heading
 .\" LP paragraph
@@ -74,6 +74,14 @@ dial the modem and start the remote ppp session.
 Use hardware flow control (i.e. RTS/CTS) to control the flow of data on
 the serial port.
 .TP
+.B xonxoff
+Use software flow control (i.e. XON/XOFF) to control the flow of data on
+the serial port.  This option is not implemented on BSD or Ultrix systems
+at present.
+.TP
+.B -crtscts
+A synonym for \fBxonxoff\fR.
+.TP
 .B defaultroute
 Add a default route to the system routing tables, using the peer as
 the gateway, when IPCP negotiation is successfully completed.
@@ -82,7 +90,8 @@ This entry is removed when the PPP connection is broken.
 .B disconnect \fI<p>
 Run the executable or shell command specified by \fI<p>\fR after
 \fIpppd\fR has terminated the link.  This script could, for example,
-issue commands to the modem to cause it to hang up.
+issue commands to the modem to cause it to hang up if hardware modem
+control signals were not available.
 .TP
 .B escape \fIxx,yy,...
 Specifies that certain characters should be escaped on transmission
@@ -288,6 +297,25 @@ hostname.  With this option, the peer will have to supply the local IP
 address during IPCP negotiation (unless it specified explicitly on the
 command line or in an options file).
 .TP
+.B lcp-echo-interval \fI<n>
+If this option is given, \fIpppd\fR will send an LCP echo-request
+frame to the peer every \fIn\fR seconds.  Under Linux, the
+echo-request is sent when no packets have been received from the peer
+for \fIn\fR seconds.  Normally the peer should respond to the
+echo-request by sending an echo-reply.  This option can be used with
+the \fIlcp-echo-failure\fR option to detect that the peer is no longer
+connected.
+.TP
+.B lcp-echo-failure \fI<n>
+If this option is given, \fIpppd\fR will presume the peer to be dead
+if \fIn\fR LCP echo-requests are sent without receiving a valid LCP
+echo-reply.  If this happens, \fIpppd\fR will terminate the
+connection.  Use of this option requires a non-zero value for the
+\fIlcp-echo-interval\fR parameter.  This option can be used to enable
+\fIpppd\fR to terminate after the physical connection has been broken
+(e.g., the modem has hung up) in situations where no hardware modem
+control lines are available.
+.TP
 .B lcp-restart \fI<n>
 Set the LCP restart interval (retransmission timeout) to <n> seconds
 (default 3).
@@ -355,7 +383,7 @@ remote IP address was specified in an option.
 .SH OPTIONS FILES
 Options can be taken from files as well as the command line.  
 .I pppd
-reads options from the files /etc/ppp/options and $HOME/.ppprc before
+reads options from the files /etc/ppp/options and ~/.ppprc before
 looking at the command line.  An options file is parsed into a series
 of words, delimited by whitespace.  Whitespace can be included in a
 word by enclosing the word in quotes (").  A backslash (\\) quotes the
@@ -575,6 +603,28 @@ process.
 .B /var/run/ppp\fIn\fB.pid \fR(BSD), \fB/etc/ppp/ppp\fIn\fB.pid \fR(SunOS)
 Process-ID for \fIpppd\fR process on ppp interface unit \fIn\fR.
 .TP
+.B /etc/ppp/ip-up
+A program or script which is executed when the link is available for
+sending and receiving IP packets (that is, IPCP has come up).  It is
+executed with the parameters \fIinterface-name tty-device speed
+local-IP-address remote-IP-address\fR.
+.IP
+This program or script is executed with the same real and effective
+user-ID as \fIpppd\fR, that is, at least the effective user-ID and
+possibly the real user-ID will be \fBroot\fR.  This is so that it can
+be used to manipulate routes, run privileged daemons (e.g.
+\fBsendmail\fR), etc.  Be careful that the contents of the
+/etc/ppp/ip-up and /etc/ppp/ip-down scripts do not compromise your
+system's security.
+.TP
+.B /etc/ppp/ip-down
+A program or script which is executed when the link is no longer
+available for sending and receiving IP packets.  This script can be
+used for undoing the effects of the /etc/ppp/ip-up script.  It is
+invoked with the same parameters as the ip-up script, and the same
+security considerations apply, since it is executed with the same
+effective and real user-IDs as \fIpppd\fR.
+.TP
 .B /etc/ppp/pap-secrets
 Usernames, passwords and IP addresses for PAP authentication.
 .TP
@@ -586,7 +636,7 @@ System default options for
 .I pppd,
 read before user default options or command-line options.
 .TP
-.B $HOME/.ppprc
+.B ~/.ppprc
 User default options, read before command-line options.
 .SH SEE ALSO
 .TP