Red Hat LINUX 7.2 - OFFICIAL LINUX CUSTOMIZATION GUIDE Guida di Installazione Scaricare il pdf (Pagina 163)

Chapter 13. Network Scripts 163

connection tools. You can also create and edit this ﬁle manually. A typical ifcfg-ppp0 ﬁles looks

like this:

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 less commonly used.

SLIP ﬁles have interface conﬁguration ﬁle names such as ifcfg-sl0.

Among the options not already discussed that may be used in these ﬁles:

• DEFROUTE= answer , where answer is one of the following:

• yes — Set this interface as the default route.

• no — Do not set the interface as the default route.

• DEMAND= answer , where answer is one of the following:

• 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 number of seconds of idle activity before the inter-

face will disconnect itself.

• INITSTRING=

string , where string is the init string passed to the modem device. 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 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 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 — This interface will modify your system’s /etc/resolv.conf ﬁle entries to use the DNS

servers provided by the remote system when a connection is established.

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Red Hat LINUX 7.2 - OFFICIAL LINUX CUSTOMIZATION GUIDE Guida di Installazione Pagina 163

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