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Chapter 12. Network Scripts

yes

  This interface will allow

pppd

to 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 will disconnect itself.

  INITSTRING= string

, where

string

is the initilization string passed to the modem de 

\

]

\

]

vice. This option is primarily used with SLIP interfaces.

  LINESPEED= value

, where

value

is the baud rate of the device. Possible standard values

\

]

\

]

here include

57600

,

38400

,

19200

, and

9600

.

  MODEMPORT= device

, where

device

is the name of the serial device that is used to estab 

\

]

\

]

lish 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 of

576

will result in fewer dropped

packets and slightly improve the throughput for a connection.

  NAME= name

, where

name

is the reference to the title given to a collection of dialup connec 

\

]

\

]

tion configurations.

  PAPNAME= name

, where

name

is the username given during the Password Authentication

\

]

\

]

Protocol (PAP) exchange that occurs to allow you to connect to a remote system.

  PEERDNS= answer

, where

answer

is one of the following:

\

]

\

]

yes

  Modify thedd system's

/etc/resolv.conf

file entries to use the DNS servers provided

by the remote system when a connection is established.

no

  The

/etc/resolv.conf

file will not be modified.

  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 the remote system's IP address. This is usually left

\

]

\

]

unspecified.

  WVDIALSECT= name

, where

name

associates this interface with a dialer configuration in

\

]

\

]

/etc/wvdial.conf

, which contains the phone number to be dialed and other important informa 

tion for the interface.

12.2.3. Other Interfaces

Other common interface configuration files that use these options include

ifcfg lo

, which controls

the IP protocol's local loopback device,

ifcfg irlan0

, which arranges settings for the first infrared

device,

ifcfg plip0

, which controls the first PLIP device, and

ifcfg tr0

, used with the first

Token Ring device.

A local loopback interface is often used in testing, as well as a variety of applications that require an

IP address pointing back to the same system. Any data sent to the loopback device is immediately

returned to the host's network layer.