This section is a quick-start guide to setting up PPP on Debian. If it turns
out that you need more details, see the excellent |PPP HOWTO| from the
Linux Documentation Project. The HOWTO goes into much more detail if you're
interested or have unique needs.
If you connect to the Internet over a phone line, you'll want to use PPP (Point-to-Point
Protocol). This is the standard connection method offered by ISPs (Internet
service providers). In addition to using PPP to dial your ISP, you can have
your computer listen for incoming connections - this lets you dial your computer
from a remote location.
Configuring PPP on Debian GNU/Linux is straightforward once you have all the
information you'll need. Debian makes things even easier with its simple configuration
Before you start, be sure you have all the information provided by your ISP.
This might include:
Username or login
Your static IP (Internet Protocol) address, if any (these look like 18.104.22.168).
This information isn't needed for most ISPs.
Bitmask (this will look something like 255.255.255.248). This information
isn't needed for most ISPs.
The IP addresses of your ISP's name servers (or DNS).
Any special login procedure required by the ISP.
Next, you'll want to investigate your hardware setup: whether your modem works
with GNU/Linux and which serial port it's connected to.
A simple rule determines whether your modem will work. If it's a ``winmodem''
or ``host-based modem,'' it won't work. These modems are cheap because they
have very little functionality, and they require the computer to make up for
their shortcomings. Unfortunately, this means they are complex to program, and
manufacturers generally do not make the specifications available for developers.
If you have a modem with its own on-board circuitry or an external modem, you
should have no trouble at all.
On GNU/Linux systems, the serial ports are referred to as /dev/ttyS0,
/dev/ttyS1, and so on. Your modem is almost certainly connected to
either port 0 or port 1, equivalent to COM1: and COM2: under Windows. If you
don't know which your modem is connected to, run the program wvdialconf
to try to detect it (see below); otherwise, just try both and see which works.
If you want to talk to your modem or dial your ISP without using PPP, you can
use the minicom program. You may need to install the minicom
package to make the program available.
The simplest way to get PPP running is with the wvdial program. It
makes some reasonable guesses and tries to set things up for you. If it works,
you're in luck. If it guesses wrong, you'll have to do things manually.
Be sure you have the following packages installed:
When you install the wvdial package, you may be given the opportunity
to configure it. Otherwise, to set up wvdial, follow these simple steps:
Log in as root, using su (as described in an earlier chapter).
touch will create the following file if the file doesn't exist; the
configuration program requires an existing file.
This means you're creating a configuration file, /etc/wvdial.conf.
Answer any questions that appear on the screen. wvdialconf will also
scan for your modem and tell you which serial port it's on; you may want to
make a note of this for future reference.