Red Hat LINUX 7.2 - OFFICIAL LINUX CUSTOMIZATION GUIDE Guida di Installazione Scaricare il pdf (Pagina 162)

162 Chapter 13. Network Scripts

Within each of the interface conﬁguration ﬁles, the following values are common:

• BOOTPROTO= protocol , where protocol is one of the following:

• none — No boot-time protocol should be used.

• bootp — The BOOTP protocol should be used.

• dhcp — The DHCP protocol should be used.

• BROADCAST=

address , where address is the broadcast address.

• DEVICE= name , where name is the name of the physical device (except

dynamically-allocated PPP devices where it is the logical name).

• IPADDR=

address , where address is the IP address.

• NETMASK= mask , where mask is the netmask value.

• NETWORK= address , where address is the network address.

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

• yes — This device should be activated at boot-time.

• no — This device should not be activated at boot-time.

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

• true — Non-root users are allowed to control this device.

• false — Non-root users are not allowed to control this device.

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.

The infrared interface allows information between devices, such as a laptop and a printer, to ﬂow over

an infrared link, which works in a similar way to an Ethernet device except that it commonly occurs

over a peer-to-peer connection.

A Parallel Line Interface Protocol (PLIP) connection works much the same way, except that it utilizes

a parallel port.

Token Ring topologies are not as common on Local Area Networks as they once were, having been

eclipsed by Ethernet.

13.1.2. Dialup Interfaces

If you connect to the Internet via PPP dialup connection, you need a conﬁguration ﬁle for that interface

as well.

This ﬁle is created automatically for you when you use RP3 or Kppp to create a dialup account. In

addition, any changes to dialup account settings are reﬂected in these interface conﬁguration ﬁles. The

Ofﬁcial Red Hat Linux Getting Started Guide contains instructions for using these GUI-based dialup

1 2 ... 157 158 159 160 161 162 163 164 165 166 167 ... 281 282

Nessun commento

Red Hat LINUX 7.2 - OFFICIAL LINUX CUSTOMIZATION GUIDE Guida di Installazione Pagina 162