112 lines
4.1 KiB
Plaintext
112 lines
4.1 KiB
Plaintext
Configuring a PPP link.
|
|
|
|
After you have compiled and installed this package, there are some
|
|
configuration files which will generally need to be set up. The
|
|
pppd(8) man page is the best reference for the full details; this file
|
|
outlines the configuration process for the most common case, where
|
|
this package is being used to enable a machine to dial an ISP and
|
|
connect to the internet. The FAQ and README.linux files also provide
|
|
useful information about setting up PPP.
|
|
|
|
Dialling an ISP.
|
|
****************
|
|
|
|
Usually, an ISP will assign an IP address to your machine, and will
|
|
refuse to authenticate itself to you. Some ISPs require a username
|
|
and password to be entered before PPP service commences, while others
|
|
use PPP authentication (using either the PAP or CHAP protocols).
|
|
|
|
The recommended way to set up to dial an ISP is for the system
|
|
administrator to create a file under /etc/ppp/peers, named for the ISP
|
|
that you will be dialling. For example, suppose the file is called
|
|
/etc/ppp/peers/isp. This file would contain something like this:
|
|
|
|
ttyS0 # modem is connected to /dev/ttyS0
|
|
38400 # run the serial port at 38400 baud
|
|
crtscts # use hardware flow control
|
|
noauth # don't require the ISP to authenticate itself
|
|
defaultroute # use the ISP as our default route
|
|
connect '/usr/sbin/chat -v -f /etc/ppp/chat-isp'
|
|
|
|
If there are any other pppd options that should apply when calling
|
|
this ISP, they can also be placed in this file.
|
|
|
|
The /etc/ppp/chat-isp file named in the last line contains the script
|
|
for chat(8) to use to dial the ISP and go through any username/
|
|
password authentication required before PPP service starts. Here is
|
|
an example (for dialling an Annex terminal server):
|
|
|
|
ABORT "NO CARRIER"
|
|
ABORT "NO DIALTONE"
|
|
ABORT "ERROR"
|
|
ABORT "NO ANSWER"
|
|
ABORT "BUSY"
|
|
ABORT "Username/Password Incorrect"
|
|
"" "at"
|
|
OK "at&d2&c1"
|
|
OK "atdt2479381"
|
|
"name:" "^Uusername"
|
|
"word:" "\qpassword"
|
|
"annex" "ppp"
|
|
"Switching to PPP-ppp-Switching to PPP"
|
|
|
|
See the chat(8) man page for details of the script. If you are not
|
|
sure how the initial dialog with your ISP will go, you could use
|
|
a terminal emulator such as kermit or minicom to go through the
|
|
process manually.
|
|
|
|
If your ISP requires PAP or CHAP authentication, you will have to
|
|
create a line in /etc/ppp/pap-secrets or /etc/ppp/chap-secrets like
|
|
this:
|
|
|
|
myhostname * "password"
|
|
|
|
(Replace myhostname with the hostname of your machine.)
|
|
|
|
At this point, you can initiate the link with the command:
|
|
|
|
/usr/sbin/pppd call isp
|
|
|
|
(N.B.: pppd might be installed in a different directory on some
|
|
systems).
|
|
|
|
This will return to the shell prompt immediately, as pppd will detach
|
|
itself from its controlling terminal. (If you don't want it to do
|
|
this, use the "nodetach" option.)
|
|
|
|
Pppd will log messages describing the progress of the connection and
|
|
any errors using the syslog facility (see the syslogd(8) and
|
|
syslog.conf(5) man pages). Pppd issues messages using syslog facility
|
|
daemon (or local2 if it has been compiled with debugging enabled);
|
|
chat uses facility local2. It is often useful to see messages of
|
|
priority notice or higher on the console. To see these, find the line
|
|
in /etc/syslog.conf which has /dev/console on the right-hand side, and
|
|
add `daemon.notice' on the left. This line should end up something
|
|
like this:
|
|
|
|
*.err;kern.debug;daemon,local2,auth.notice;mail.crit /dev/console
|
|
|
|
If you want to see more messages from pppd, request messages of
|
|
priority info or higher for facility daemon, like this:
|
|
|
|
*.err;kern.debug;daemon.info;local2,auth.notice;mail.crit /dev/console
|
|
|
|
It is also useful to add a line like this:
|
|
|
|
daemon,local2.debug /etc/ppp/ppp-log
|
|
|
|
If you do this, you will need to create an empty /etc/ppp/ppp-log
|
|
file.
|
|
|
|
After modifying syslog.conf, you will then need to send a HUP signal
|
|
to syslogd (or reboot).
|
|
|
|
When you wish terminate the PPP link, you should send a TERM or INTR
|
|
signal to pppd. Pppd writes its process ID to a file called
|
|
ppp<n>.pid in /var/run (or /etc/ppp on older systems such as SunOS or
|
|
Ultrix). Here <n> is the PPP interface unit number, which will be 0
|
|
unless you have more than one PPP link running simultaneously. Thus
|
|
you can terminate the link with a command like
|
|
|
|
kill `cat /var/run/ppp0.pid`
|