The interface control scripts activate and deactivated system
interfaces. There are two primary interface control scripts,
/sbin/ifdown and /sbin/ifup, that call on control scripts located in
the /etc/sysconfig/network-scripts/
directory.
The ifup and ifdown interface scripts are symbolic links to
scripts in the /sbin/ directory. When
either of these scripts are called, they require the value of the
interface to be specified, such as:
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Caution |
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The ifup and ifdown interface scripts are the only scripts that
the user should use to bring up and take down network
interfaces.
The following scripts are described for reference purposes
only.
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Two files used to perform a variety of network initialization
tasks during the process of bringing up a network interface are
/etc/rc.d/init.d/functions and /etc/sysconfig/network-scripts/network-functions.
Refer to Section 8.4
Network Function Files for more information.
After verifying that an interface has been specified and that
the user executing the request is allowed to control the interface,
the correct script brings the interface up or down. The following
are common interface control scripts found within the /etc/sysconfig/network-scripts/ directory:
-
ifup-aliases — Configures IP
aliases from interface configuration files when more than one IP
address is associated with an interface.
-
ifup-ippp and ifdown-ippp — Brings ISDN interfaces up and
down.
-
ifup-ipsec and ifdown-ipsec — Brings IPsec interfaces up and
down.
-
ifup-ipv6 and ifdown-ipv6 — Brings IPv6 interfaces up and
down.
-
ifup-ipx — Brings up an IPX
interface.
-
ifup-plip — Brings up a PLIP
interface.
-
ifup-plusb — Brings up a USB
interface for network connections.
-
ifup-post and ifdown-post — Contains commands to be
executed after an interface is brought up or down.
-
ifup-ppp and ifdown-ppp — Brings a PPP interface up or
down.
-
ifup-routes — Adds static routes
for a device as its interface is brought up.
-
ifdown-sit and ifup-sit — Contains function calls related to
bringing up and down an IPv6 tunnel within an IPv4 connection.
-
ifup-sl and ifdown-sl — Brings a SLIP interface up or
down.
-
ifup-wireless — Brings up a
wireless interface.
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Warning |
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Removing or modifying any scripts in the /etc/sysconfig/network-scripts/ directory can cause
interface connections to act irregularly or fail. Only advanced
users should modify scripts related to a network interface.
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The easiest way to manipulate all network scripts simultaneously
is to use the /sbin/service command on the
network service (/etc/rc.d/init.d/network), as illustrated the
following command:
/sbin/service network <action>
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In this example, <action>
can be either start, stop, or restart.
To view a list of configured devices and currently active
network interfaces, use the following command:
/sbin/service network status
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