.\" manual page [] for pppd 2.0
-.\" $Id: pppd.8,v 1.2 1994/02/08 23:50:51 paulus Exp $
+.\" $Id: pppd.8,v 1.15 1995/08/17 01:52:17 paulus Exp $
.\" SH section heading
.\" SS subsection heading
.\" LP paragraph
.SH SYNOPSIS
.B pppd
[
-.I options
-] [
.I tty_name
] [
.I speed
+] [
+.I options
]
.SH DESCRIPTION
.LP
.I <tty_name>
Communicate over the named device. The string "/dev/"
is prepended if necessary. If no device name is given,
+or if the name of the controlling terminal is given,
.I pppd
will use the controlling terminal, and will not fork to put itself in
the background.
.TP
.I <speed>
-Set the baud rate to <speed>. On systems such as 4.4BSD and NetBSD,
-any speed can be specified. Other systems (e.g. SunOS) allow only a
-limited set of speeds.
+Set the baud rate to <speed> (a decimal number). On systems such as
+4.4BSD and NetBSD, any speed can be specified. Other systems
+(e.g. SunOS) allow only a limited set of speeds.
.TP
.B asyncmap \fI<map>
Set the async character map to <map>.
This map describes which control characters cannot be successfully
received over the serial line.
.I pppd
-will ask the peer to send these characters as a 2-byte "escape" sequence.
+will ask the peer to send these characters as a 2-byte escape sequence.
The argument is a 32 bit hex number
with each bit representing a character to escape.
Bit 0 (00000001) represents the character 0x00;
bit 31 (80000000) represents the character 0x1f or ^_.
-The default asyncmap is 0. If multiple \fBasyncmap\fR options are
+If multiple \fBasyncmap\fR options are
given, the values are ORed together.
+If no \fBasyncmap\fR option is given, no async character map will be
+negotiated for the receive direction; the peer should then escape
+\fIall\fR control characters.
.TP
.B auth
Require the peer to authenticate itself before allowing network
packets to be sent or received.
.TP
.B connect \fI<p>
-Use the executable or shell command specified by <p> to set up the
-serial line. This script would typically use the "chat" program to
+Use the executable or shell command specified by \fI<p>\fR to set up the
+serial line. This script would typically use the chat(8) program to
dial the modem and start the remote ppp session.
.TP
.B crtscts
-Use hardware flow control (i.e. RTS/CTS) to control the flow of data on
-the serial port.
+Use hardware flow control (i.e. RTS/CTS) to control the flow of data
+on the serial port. If neither the \fBcrtscts\fR nor the
+\fB\-crtscts\fR option is given, the hardware flow control setting for
+the serial port is left unchanged.
.TP
.B defaultroute
Add a default route to the system routing tables, using the peer as
the gateway, when IPCP negotiation is successfully completed.
This entry is removed when the PPP connection is broken.
.TP
+.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 if hardware modem
+control signals were not available.
+.TP
+.B escape \fIxx,yy,...
+Specifies that certain characters should be escaped on transmission
+(regardless of whether the peer requests them to be escaped with its
+async control character map). The characters to be escaped are
+specified as a list of hex numbers separated by commas. Note that
+almost any character can be specified for the \fBescape\fR option,
+unlike the \fBasyncmap\fR option which only allows control characters
+to be specified. The characters which may not be escaped are those
+with hex values 0x20 - 0x3f or 0x5e.
+.TP
.B file \fI<f>
Read options from file <f> (the format is described below).
.TP
+.B lock
+Specifies that \fIpppd\fR should create a UUCP-style lock file for the
+serial device to ensure exclusive access to the device.
+.TP
.B mru \fI<n>
Set the MRU [Maximum Receive Unit] value to <n> for negotiation.
.I pppd
-will ask the peer to send packets of no more than <n> bytes.
- The minimum MRU value is 128.
-The default MRU value is 1500. A value of 296 is recommended for slow
-links (40 bytes for TCP/IP header + 256 bytes of data).
+will ask the peer to send packets of no more than <n> bytes. The
+minimum MRU value is 128. The default MRU value is 1500. A value of
+296 is recommended for slow links (40 bytes for TCP/IP header + 256
+bytes of data).
+.TP
+.B mtu \fI<n>
+Set the MTU [Maximum Transmit Unit] value to \fI<n>\fR. Unless the
+peer requests a smaller value via MRU negotiation, \fIpppd\fR will
+request that the kernel networking code send data packets of no more
+than \fIn\fR bytes through the PPP network interface.
.TP
.B netmask \fI<n>
-Set the interface netmask to <n>, a 32 bit netmask in "decimal dot" notation
-(e.g. 255.255.255.0).
+Set the interface netmask to <n>, a 32 bit netmask in "decimal dot"
+notation (e.g. 255.255.255.0). If this option is given, the value
+specified is ORed with the default netmask. The default netmask is
+chosen based on the negotiated remote IP address; it is the
+appropriate network mask for the class of the remote IP address, ORed
+with the netmasks for any non point-to-point network interfaces in the
+system which are on the same network.
.TP
.B passive
Enables the "passive" option in the LCP. With this option,
With this option,
.I pppd
will not transmit LCP packets to initiate a connection until a valid
-LCP packet is received from the peer (as for the "passive" option with
-old versions of \fIpppd\fR).
+LCP packet is received from the peer (as for the `passive' option with
+ancient versions of \fIpppd\fR).
.SH OPTIONS
.TP
.I <local_IP_address>\fB:\fI<remote_IP_address>
.B noipdefault
option is given). The remote address will be obtained from the peer
if not specified in any option. Thus, in simple cases, this option is
-not required.
-If a local and/or remote IP address is specified with this option,
+not required. If a local and/or remote IP address is specified with
+this option,
.I pppd
will not accept a different value from the peer in the IPCP
negotiation, unless the
.B ipcp-accept-remote
options are given, respectively.
.TP
+.B -ac
+Disable Address/Control compression negotiation (use default, i.e.
+address/control field compression disabled).
+.TP
.B -all
Don't request or allow negotiation of any options for LCP and IPCP (use
default values).
.TP
-.B -ac
-Disable Address/Control compression negotiation (use default, i.e.
-disabled).
-.TP
.B -am
-Disable asyncmap negotiation (use default, i.e. 0xffffffff).
+Disable asyncmap negotiation (use the default asyncmap, i.e. escape
+all control characters).
.TP
.B -as \fI<n>
Same as
.B asyncmap \fI<n>
.TP
+.B bsdcomp \fInr,nt
+Request that the peer compress packets that it sends, using the
+BSD-Compress scheme, with a maximum code size of \fInr\fR bits, and
+agree to compress packets sent to the peer with a maximum code size of
+\fInt\fR bits. If \fInt\fR is not specified, it defaults to the value
+given for \fInr\fR. Values in the range 9 to 15 may be used for
+\fInr\fR and \fInt\fR; larger values give better compression but
+consume more kernel memory for compression dictionaries.
+Alternatively, a value of 0 for \fInr\fR or \fInt\fR disables
+compression in the corresponding direction.
+.TP
+.B \-bsdcomp
+Disables compression; \fBpppd\fR will not request or agree to compress
+packets using the BSD-Compress scheme.
+.TP
+.B +chap
+Require the peer to authenticate itself using CHAP [Cryptographic
+Handshake Authentication Protocol] authentication.
+.TP
+.B -chap
+Don't agree to authenticate using CHAP.
+.TP
+.B chap-interval \fI<n>
+If this option is given,
+.I pppd
+will rechallenge the peer every <n> seconds.
+.TP
+.B chap-max-challenge \fI<n>
+Set the maximum number of CHAP challenge transmissions to <n> (default
+10).
+.TP
+.B chap-restart \fI<n>
+Set the CHAP restart interval (retransmission timeout for challenges)
+to <n> seconds (default 3).
+.TP
+.B -crtscts
+Disable hardware flow control (i.e. RTS/CTS) on the serial port. If
+neither the \fBcrtscts\fR nor the \fB\-crtscts\fR option is given,
+the hardware flow control setting for the serial port is left
+unchanged.
+.TP
.B -d
-Increase debugging level.
+Increase debugging level (same as the \fBdebug\fR option).
+.TP
+.B debug
+Increase debugging level (same as \fB\-d\fR).
+If this
+option is given, \fIpppd\fR will log the contents of all control
+packets sent or received in a readable form. The packets are logged
+through syslog with facility \fIdaemon\fR and level \fIdebug\fR. This
+information can be directed to a file by setting up /etc/syslog.conf
+appropriately (see syslog.conf(5)).
+.TP
+.B \-defaultroute
+Disable the \fBdefaultroute\fR option. The system administrator who
+wishes to prevent users from creating default routes with \fIpppd\fR
+can do so by placing this option in the /etc/ppp/options file.
.TP
.B -detach
Don't fork to become a background process (otherwise
.I pppd
-will do so if a serial device is specified).
+will do so if a serial device other than its controlling terminal is
+specified).
+.TP
+.B domain \fI<d>
+Append the domain name <d> to the local host name for authentication
+purposes. For example, if gethostname() returns the name porsche, but the
+fully qualified domain name is porsche.Quotron.COM, you would use the
+domain option to set the domain name to Quotron.COM.
.TP
.B -ip
-Disable IP address negotiation (with this option, the remote IP
+Disable IP address negotiation. If this option is used, the remote IP
address must be specified with an option on the command line or in an
-options file).
+options file.
.TP
-.B -mn
-Disable magic number negotiation. With this option,
+.B ipcp-accept-local
+With this option,
.I pppd
-cannot detect a looped-back line.
-.TP
-.B -mru
-Disable MRU [Maximum Receive Unit] negotiation (use default, i.e. 1500).
-.TP
-.B -p
-Same as the
-.B passive
-option.
+will accept the peer's idea of our local IP address, even if the
+local IP address was specified in an option.
.TP
-.B -pc
-Disable protocol field compression negotiation (use default, i.e. disabled).
+.B ipcp-accept-remote
+With this option,
+.I pppd
+will accept the peer's idea of its (remote) IP address, even if the
+remote IP address was specified in an option.
.TP
-.B +ua \fI<p>
-Agree to authenticate using PAP [Password Authentication Protocol] if
-requested by the peer, and
-use the data in file <p> for the user and password to send to the
-peer. The file contains the remote user name, followed by a newline,
-followed by the remote password, followed by a newline. This option
-is obsolescent.
+.B ipcp-max-configure \fI<n>
+Set the maximum number of IPCP configure-request transmissions to <n>
+(default 10).
.TP
-.B +pap
-Require the peer to authenticate itself using PAP.
+.B ipcp-max-failure \fI<n>
+Set the maximum number of IPCP configure-NAKs returned before starting
+to send configure-Rejects instead to <n> (default 10).
.TP
-.B -pap
-Don't agree to authenticate using PAP.
+.B ipcp-max-terminate \fI<n>
+Set the maximum number of IPCP terminate-request transmissions to <n>
+(default 3).
.TP
-.B +chap
-Require the peer to authenticate itself using CHAP [Cryptographic
-Handshake Authentication Protocol] authentication.
+.B ipcp-restart \fI<n>
+Set the IPCP restart interval (retransmission timeout) to <n> seconds
+(default 3).
.TP
-.B -chap
-Don't agree to authenticate using CHAP.
+.B ipparam \fIstring
+Provides an extra parameter to the ip-up and ip-down scripts. If this
+option is given, the \fIstring\fR supplied is given as the 6th
+parameter to those scripts.
+.TP
+.B kdebug \fIn
+Enable debugging code in the kernel-level PPP driver. The argument
+\fIn\fR is a number which is the sum of the following values: 1 to
+enable general debug messages, 2 to request that the contents of
+received packets be printed, and 4 to request that the contents of
+transmitted packets be printed.
+.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-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 -vj
-Disable negotiation of Van Jacobson style IP header compression (use
-default, i.e. no compression).
+.B lcp-max-configure \fI<n>
+Set the maximum number of LCP configure-request transmissions to <n>
+(default 10).
.TP
-.B debug
-Increase debugging level (same as
-.B -d
-).
+.B lcp-max-failure \fI<n>
+Set the maximum number of LCP configure-NAKs returned before starting
+to send configure-Rejects instead to <n> (default 10).
.TP
-.B domain \fI<d>
-Append the domain name <d> to the local host name for authentication
-purposes. For example, if gethostname() returns the name porsche, but the
-fully qualified domain name is porsche.Quotron.COM, you would use the
-domain option to set the domain name to Quotron.COM.
+.B lcp-max-terminate \fI<n>
+Set the maximum number of LCP terminate-request transmissions to <n>
+(default 3).
.TP
-.B modem
-Use the modem control lines. (This option is not fully implemented.)
+.B lcp-restart \fI<n>
+Set the LCP restart interval (retransmission timeout) to <n> seconds
+(default 3).
.TP
.B local
-Don't use the modem control lines.
-.TP
-.B name \fI<n>
-Set the name of the local system for authentication purposes to <n>.
+Don't use the modem control lines. With this option,
+.B pppd
+will ignore the state of the CD (Carrier Detect) signal from the modem and
+will not change the state of the DTR (Data Terminal Ready) signal.
.TP
-.B user \fI<u>
-Set the user name to use for authenticating this machine with the peer
-using PAP to <u>.
+.B login
+Use the system password database for authenticating the peer using
+PAP, and record the user in the system wtmp file.
.TP
-.B usehostname
-Enforce the use of the hostname as the name of the local system for
-authentication purposes (overrides the
-.B name
-option).
+.B modem
+Use the modem control lines. This option is the default. With this
+option,
+.B pppd
+will wait for the CD (Carrier Detect) signal from the modem to be asserted
+when opening the serial device
+(unless a connect script is specified), and it will drop the DTR (Data
+Terminal Ready) signal briefly when the connection is terminated and before
+executing the connect script.
+On Ultrix, this option implies hardware
+flow control, as for the \fBcrtscts\fR option.
.TP
-.B remotename \fI<n>
-Set the assumed name of the remote system for authentication purposes
-to <n>.
+.B -mn
+Disable magic number negotiation. With this option,
+.I pppd
+cannot detect a looped-back line.
.TP
-.B proxyarp
-Add an entry to this system's ARP [Address Resolution Protocol] table
-with the IP address of the peer and the Ethernet address of this
-system.
+.B -mru
+Disable MRU [Maximum Receive Unit] negotiation. With this option,
+\fIpppd\fR will use the default MRU value of 1500 bytes.
.TP
-.B login
-Use the system password database for authenticating the peer using
-PAP.
+.B name \fI<n>
+Set the name of the local system for authentication purposes to <n>.
.TP
.B noipdefault
Disables the default behaviour when no local IP address is specified,
address during IPCP negotiation (unless it specified explicitly on the
command line or in an options file).
.TP
-.B lcp-restart \fI<n>
-Set the LCP restart interval (retransmission timeout) to <n> seconds
-(default 3).
+.B -p
+Same as the
+.B passive
+option.
.TP
-.B lcp-max-terminate \fI<n>
-Set the maximum number of LCP terminate-request transmissions to <n>
-(default 3).
+.B +pap
+Require the peer to authenticate itself using PAP.
.TP
-.B lcp-max-configure \fI<n>
-Set the maximum number of LCP configure-request transmissions to <n>
-(default 10).
+.B -pap
+Don't agree to authenticate using PAP.
.TP
-.B lcp-max-failure \fI<n>
-Set the maximum number of LCP configure-NAKs returned before starting
-to send configure-Rejects instead to <n> (default 10).
+.B papcrypt
+Indicates that all secrets in the /etc/ppp/pap-secrets file which
+are used for checking the identity of the peer are encrypted, and thus
+pppd should not accept a password which (before encryption) is
+identical to the secret from the /etc/ppp/pap-secrets file.
.TP
-.B ipcp-restart \fI<n>
-Set the IPCP restart interval (retransmission timeout) to <n> seconds
-(default 3).
+.B pap-max-authreq \fI<n>
+Set the maximum number of PAP authenticate-request transmissions to
+<n> (default 10).
.TP
-.B ipcp-max-terminate \fI<n>
-Set the maximum number of IPCP terminate-request transmissions to <n>
+.B pap-restart \fI<n>
+Set the PAP restart interval (retransmission timeout) to <n> seconds
(default 3).
.TP
-.B ipcp-max-configure \fI<n>
-Set the maximum number of IPCP configure-request transmissions to <n>
-(default 10).
+.B pap-timeout \fI<n>
+Set the maximum time that
+.I pppd
+will wait for the peer to authenticate itself with PAP to
+<n> seconds (0 means no limit).
.TP
-.B ipcp-max-failure \fI<n>
-Set the maximum number of IPCP configure-NAKs returned before starting
-to send configure-Rejects instead to <n> (default 10).
+.B -pc
+Disable protocol field compression negotiation (use default, i.e.
+protocol field compression disabled).
.TP
-.B pap-restart \fI<n>
-Set the PAP restart interval (retransmission timeout) to <n> seconds
-(default 3).
+.B persist
+Do not exit after a connection is terminated; instead try to reopen
+the connection.
.TP
-.B pap-max-authreq \fI<n>
-Set the maximum number of PAP authenticate-request transmissions to
-<n> (default 10).
+.B proxyarp
+Add an entry to this system's ARP [Address Resolution Protocol] table
+with the IP address of the peer and the Ethernet address of this
+system.
.TP
-.B chap-restart \fI<n>
-Set the CHAP restart interval (retransmission timeout for challenges)
-to <n> seconds (default 3).
+.B \-proxyarp
+Disable the \fBproxyarp\fR option. The system administrator who
+wishes to prevent users from creating proxy ARP entries with
+\fIpppd\fR can do so by placing this option in the /etc/ppp/options
+file.
.TP
-.B chap-max-challenge \fI<n>
-Set the maximum number of CHAP challenge transmissions to <n> (default
-10).
+.B remotename \fI<n>
+Set the assumed name of the remote system for authentication purposes
+to <n>.
.TP
-.B chap-interval \fI<n>
-If this option is given,
-.I pppd
-will rechallenge the peer every <n> seconds.
+.B +ua \fI<p>
+Agree to authenticate using PAP [Password Authentication Protocol] if
+requested by the peer, and
+use the data in file <p> for the user and password to send to the
+peer. The file contains the remote user name, followed by a newline,
+followed by the remote password, followed by a newline. This option
+is obsolescent.
.TP
-.B ipcp-accept-local
-With this option,
-.I pppd
-will accept the peer's idea of our local IP address, even if the
-local IP address was specified in an option.
+.B usehostname
+Enforce the use of the hostname as the name of the local system for
+authentication purposes (overrides the
+.B name
+option).
.TP
-.B ipcp-accept-remote
-With this option,
-.I pppd
-will accept the peer's idea of its (remote) IP address, even if the
-remote IP address was specified in an option.
+.B user \fI<u>
+Set the user name to use for authenticating this machine with the peer
+using PAP to <u>.
+.TP
+.B -vj
+Disable negotiation of Van Jacobson style TCP/IP header compression (use
+default, i.e. no compression).
+.TP
+.B -vjccomp
+Disable the connection-ID compression option in Van Jacobson style
+TCP/IP header compression. With this option, \fIpppd\fR will not omit
+the connection-ID byte from Van Jacobson compressed TCP/IP headers,
+nor ask the peer to do so.
+.TP
+.B vj-max-slots \fIn
+Sets the number of connection slots to be used by the Van Jacobson
+TCP/IP header compression and decompression code to \fIn\fR, which
+must be between 2 and 16 (inclusive).
+.TP
+.B xonxoff
+Use software flow control (i.e. XON/XOFF) to control the flow of data on
+the serial port. This option is only implemented on Linux systems
+at present.
.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
.LP
A secrets file is parsed into words as for a options file. A secret
is specified by a line containing at least 3 words, in the order
-client, server, secret. Any following words on the same line are
+client name, server name, secret. Any following words on the same line are
taken to be a list of acceptable IP addresses for that client. If
there are only 3 words on the line, it is assumed that any IP address
is OK; to disallow all IP addresses, use "-". If the secret starts
password supplied by the peer. If the password doesn't match the
secret, the password is encrypted using crypt() and checked against
the secret again; thus secrets for authenticating the peer can be
-stored in encrypted form. If the \fBlogin\fR option was specified, the
+stored in encrypted form. If the \fBpapcrypt\fR option is given, the
+first (unencrypted) comparison is omitted, for better security.
+.LP
+If the \fBlogin\fR option was specified, the
username and password are also checked against the system password
database. Thus, the system administrator can set up the pap-secrets
file to allow PPP access only to certain users, and to restrict the
-set of IP addresses that each user can use.
+set of IP addresses that each user can use. Typically, when using the
+\fBlogin\fR option, the secret in /etc/ppp/pap-secrets would be "", to
+avoid the need to have the same secret in two places.
.LP
Secrets are selected from the CHAP secrets file as follows:
.TP 2
fails, \fIpppd\fR will terminated the link (by closing LCP). If IPCP
negotiates an unacceptable IP address for the remote host, IPCP will
be closed. IP packets can only be sent or received when IPCP is open.
+.LP
+In some cases it is desirable to allow some hosts which can't
+authenticate themselves to connect and use one of a restricted set of
+IP addresses, even when the local host generally requires
+authentication. If the peer refuses to authenticate itself when
+requested, \fIpppd\fR takes that as equivalent to authenticating with
+PAP using the empty string for the username and password. Thus, by
+adding a line to the pap-secrets file which specifies the empty string
+for the client and password, it is possible to allow restricted access
+to hosts which refuse to authenticate themselves.
.SH ROUTING
.LP
When IPCP negotiation is completed successfully,
pppd /dev/ttya 38400 connect 'chat "" "" "login:" "username"
"Password:" "password" "% " "exec pppd passive"'
.LP
+(Note however that running chat like this will leave the password
+visible in the parameter list of pppd and chat.)
+.LP
If your serial connection is any more complicated than a piece of
wire, you may need to arrange for some control characters to be
escaped. In particular, it is often useful to escape XON (^Q) and
XOFF (^S), using \fBasyncmap a0000\fR. If the path includes a telnet,
you probably should escape ^] as well (\fBasyncmap 200a0000\fR).
-Don't use an rlogin in the path - many implementations are not
+If the path includes an rlogin, you will need to use the \fBescape
+ff\fR option on the end which is running the rlogin client, since many
+rlogin implementations are not
transparent; they will remove the sequence [0xff, 0xff, 0x73, 0x73,
followed by any 8 bytes] from the stream.
.SH DIAGNOSTICS
.LP
-Messages are sent to the syslog daemon using facility
-LOG_DAEMON unless
-.I pppd
-has been compiled with debugging code. In this case the logging
-facility used will be LOG_LOCAL2 in order to allow separation of the debug
-output from the other daemons using the LOG_DAEMON facility. You can
-override this by defining the macro LOG_PPP to the desired facility
-and recompiling. In order to see the error and debug messages, you
-will need to edit your /etc/syslog.conf file to direct the messages to
-the desired output device or file.
+Messages are sent to the syslog daemon using facility LOG_DAEMON.
+(This can be overriden by recompiling \fIpppd\fR with the macro
+LOG_PPP defined as the desired facility.) In order to see the error
+and debug messages, you will need to edit your /etc/syslog.conf file
+to direct the messages to the desired output device or file.
+.LP
+The \fBdebug\fR option causes the contents of all control packets sent
+or received to be logged, that is, all LCP, PAP, CHAP or IPCP packets.
+This can be useful if the PPP negotiation does not succeed.
+If debugging is enabled at compile time, the \fBdebug\fR option also
+causes other debugging messages to be logged.
.LP
-If enabled at compile time, debugging printout can be enabled by
-setting the -d or debug flag on the command line, or by sending a
+Debugging can also be enabled or disabled by sending a
SIGUSR1 to the
.I pppd
-process.
-Debugging may be disabled by sending a SIGUSR2 to the
-.I pppd
-process.
+process. This signal acts as a toggle.
.SH FILES
.TP
-.B /var/run/ppp\fIn\fB.pid \fR(BSD), \fB/etc/ppp/ppp\fIn\fB.pid \fR(SunOS)
+.B /var/run/ppp\fIn\fB.pid \fR(BSD or Linux), \fB/etc/ppp/ppp\fIn\fB.pid \fR(others)
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
+.IP
+\fIinterface-name tty-device speed local-IP-address
+remote-IP-address\fR
+.IP
+and with its standard input,
+output and error streams redirected to \fB/dev/null\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
.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.
+.TP
+.B /etc/ppp/options.\fIttyname
+System default options for the serial port being used, read after
+command-line options.
.SH SEE ALSO
.TP
.B RFC1144
.I The MD5 Message-Digest Algorithm.
1992 April.
.TP
-.B RFC1331
-Simpson, W.A.
-.I Point\-to\-Point Protocol (PPP) for the transmission of multi\-protocol
-.I datagrams over point\-to\-point links.
-1992 May.
-.TP
.B RFC1332
McGregor, G.
.I PPP Internet Protocol Control Protocol (IPCP).
Lloyd, B.; Simpson, W.A.
.I PPP authentication protocols.
1992 October.
+.TP
+.B RFC1548
+Simpson, W.A.
+.I The Point\-to\-Point Protocol (PPP).
+1993 December.
+.TP
+.B RFC1549
+Simpson, W.A.
+.I PPP in HDLC Framing.
+1993 December
.SH NOTES
The following signals have the specified effect when sent to the
.I pppd
process.
.TP
.B SIGINT, SIGTERM
-These signals cause \fIpppd\fR to terminate the link (by closing LCP),
+These signals cause \fBpppd\fR to terminate the link (by closing LCP),
restore the serial device settings, and exit.
.TP
.B SIGHUP
-Indicates that the physical layer has been disconnected. \fIpppd\fR
-will attempt to restore the serial device settings (this may produce
-error messages on Suns), and then exit.
-.SH BUGS
-The use of the modem control lines and the effects of the \fBmodem\fR
-and \fBlocal\fR options are not well defined.
+This signal causes \fBpppd\fR to terminate the link, restore the
+serial device settings, and close the serial device. If the
+\fBpersist\fR option has been specified, \fBpppd\fR will try to reopen
+the serial device and start another connection. Otherwise \fBpppd\fR
+will exit.
+.TP
+.B SIGUSR2
+This signal causes
+.B pppd
+to renegotiate compression. This can be useful to re-enable
+compression after it has been disabled as a result of a fatal
+decompression error. With the BSD Compress scheme, fatal
+decompression errors generally indicate a bug in one or other
+implementation.
+
.SH AUTHORS
Drew Perkins,
Brad Clements,
Karl Fox,
Greg Christy,
-Brad Parker (brad@fcr.com),
-Paul Mackerras (paulus@cs.anu.edu.au)
+Brad Parker,
+Paul Mackerras (paulus@cs.anu.edu.au).
projects / ppp.git / blobdiff