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16.2.5. Dialup Interfaces
If you are connecting to the Internet via a dialup connection, a configuration file is necessary for the interface.
PPP interface files are named using the following format:
ifcfg-ppp<X>- where <X> is a unique number corresponding to a specific interface.
The PPP interface configuration file is created automatically when
wvdial, the Network Administration Tool or Kppp is used to create a dialup account. It is also possible to create and edit this file manually.
The following is a typical
ifcfg-ppp0 file:
DEVICE=ppp0 NAME=test WVDIALSECT=test MODEMPORT=/dev/modem LINESPEED=115200 PAPNAME=test USERCTL=true ONBOOT=no PERSIST=no DEFROUTE=yes PEERDNS=yes DEMAND=no IDLETIMEOUT=600
Serial Line Internet Protocol (SLIP) is another dialup interface, although it is used less frequently. SLIP files have interface configuration file names such as
ifcfg-sl0.
Other options that may be used in these files include:
-
DEFROUTE=<answer> - where
<answer>is one of the following:yes— Set this interface as the default route.no— Do not set this interface as the default route.
-
DEMAND=<answer> - where
<answer>is one of the following:yes— This interface allowspppdto initiate a connection when someone attempts to use it.no— A connection must be manually established for this interface.
-
IDLETIMEOUT=<value> - where
<value>is the number of seconds of idle activity before the interface disconnects itself. -
INITSTRING=<string> - where
<string>is the initialization string passed to the modem device. This option is primarily used in conjunction with SLIP interfaces. -
LINESPEED=<value> - where
<value>is the baud rate of the device. Possible standard values include57600,38400,19200, and9600. -
MODEMPORT=<device> - where
<device>is the name of the serial device that is used to establish the connection for the interface. -
MTU=<value> - where
<value>is the Maximum Transfer Unit (MTU) setting for the interface. The MTU refers to the largest number of bytes of data a frame can carry, not counting its header information. In some dialup situations, setting this to a value of576results in fewer packets dropped and a slight improvement to the throughput for a connection. -
NAME=<name> - where
<name>is the reference to the title given to a collection of dialup connection configurations. -
PAPNAME=<name> - where
<name>is the username given during the Password Authentication Protocol (PAP) exchange that occurs to allow connections to a remote system. -
PERSIST=<answer> - where
<answer>is one of the following:yes— This interface should be kept active at all times, even if deactivated after a modem hang up.no— This interface should not be kept active at all times.
-
REMIP=<address> - where
<address>is theIPaddress of the remote system. This is usually left unspecified. -
WVDIALSECT=<name> - where
<name>associates this interface with a dialer configuration in/etc/wvdial.conf. This file contains the phone number to be dialed and other important information for the interface.
