Red Hat LINUX 7.2 - OFFICIAL LINUX CUSTOMIZATION GUIDE Installationsanleitung PDF herunterladen (Seite 164)

164 Chapter 13. Network Scripts

• no — The /etc/resolv.conf ﬁle will not be changed.

• 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.

13.1.3. Alias and Clone Files

Two lesser used types of interface conﬁguration ﬁles found in /etc/sysconfig/network-

scripts are alias and clone ﬁles, which include an additional component in the name of the ﬁle

beyond the interface name.

Alias interface conﬁguration ﬁles take names in the format of ifcfg-

if-name : alias-

value

, and they allow an alias to point to an interface. For example, a ifcfg-eth0:0 ﬁle could

be conﬁgured to specify DEVICE=eth0:0 and a static IP address of 10.0.0.2, serving as an alias of

an Ethernet interface already conﬁgured to receive its IP information via DHCP in ifcfg-eth0. At

that point, the eth0 device is bound to a dynamic IP address, but it can always be referred to on that

system via the ﬁxed 10.0.0.2 IP address.

A clone interface conﬁguration ﬁle has a name similar to ifcfg- if-name - clone-name .

While an alias ﬁle is another way to refer to an existing interface conﬁguration ﬁle, a clone ﬁle is used

to specify additional options when specifying an interface. For example, if you have a standard DHCP

Ethernet interface called eth0, it may look similar to this:

DEVICE=eth0

ONBOOT=yes

BOOTPROTO=dhcp

Since USERCTL is not set to yes, users cannot bring this interface up and down. To give users this

ability, create a clone called user from ifcfg-eth0 which allows a user to bring up and down the

eth0 interface. The resulting name of the clone would be ifcfg-eth0-user and would only need

one line:

USERCTL=yes

When a user moves to bring up the eth0 interface with the ifup eth0-user command, the con-

ﬁguration options from ifcfg-eth0 and ifcfg-eth0-user are used together. While this is a very

basic example, this method can be used with a variety of options and interfaces.

The easiest way to create alias and clone interface conﬁguration ﬁles is to use the GUI-based Network

Conﬁgurator (redhat-config-network) tool.

1 2 ... 159 160 161 162 163 164 165 166 167 168 169 ... 281 282

Keine Kommentare

Red Hat LINUX 7.2 - OFFICIAL LINUX CUSTOMIZATION GUIDE Installationsanleitung Seite 164