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GNU/Linux man pages

Livre :
Expressions régulières,
Syntaxe et mise en oeuvre :

ISBN : 978-2-7460-9712-4
EAN : 9782746097124
(Editions ENI)

GNU/Linux

Debian 6.0.1

(Squeeze)

ifdown(8)


ifup

ifup

NAME
SYNOPSIS
DESCRIPTION
OPTIONS
EXAMPLES
NOTES
FILES
KNOWN BUGS/LIMITATIONS
AUTHOR
SEE ALSO

NAME

ifup − bring a network interface up

ifdown − take a network interface down

SYNOPSIS

ifup [−nv] [−−no−act] [−−verbose] [−i FILE|−−interfaces=FILE] [−−allow CLASS] −a|IFACE...
ifup −h
|−−help
ifup −V
|−−version

ifdown [−nv] [−−no−act] [−−verbose] [−i FILE|−−interfaces=FILE] [−−allow CLASS] −a|IFACE...

DESCRIPTION

The ifup and ifdown commands may be used to configure (or, respectively, deconfigure) network interfaces based on interface definitions in the file /etc/network/interfaces.

OPTIONS

A summary of options is included below.
−a
, −−all

If given to ifup, affect all interfaces marked auto. Interfaces are brought up in the order in which they are defined in /etc/network/interfaces. If given to ifdown, affect all defined interfaces. Interfaces are brought down in the order in which they are currently listed in the state file. Only interfaces defined in /etc/network/interfaces will be brought down.

−−force

Force configuration or deconfiguration of the interface.

−h, −−help

Show summary of options.

−−allow=CLASS

Only allow interfaces listed in an allow−CLASS line in /etc/network/interfaces to be acted upon.

−i FILE, −−interfaces=FILE

Read interface definitions from FILE instead of from /etc/network/interfaces.

−n, −−no−act

Don’t configure any interfaces or run any "up" or "down" commands.

−−no−mappings

Don’t run any mappings. See interfaces(5) for more information about the mapping feature.

−V, −−version

Show copyright and version information.

−v, −−verbose

Show commands as they are executed.

EXAMPLES

ifup -a

Bring up all the interfaces defined with auto in /etc/network/interfaces

ifup eth0

Bring up interface eth0

ifup eth0=home

Bring up interface eth0 as logical interface home

ifdown -a

Bring down all interfaces that are currently up.

NOTES

ifup and ifdown are actually the same program called by different names.

The program does not configure network interfaces directly; it runs low level utilities such as ifconfig and route to do its dirty work.

FILES

/etc/network/interfaces

definitions of network interfaces See interfaces(5) for more information.

/etc/network/run/ifstate

current state of network interfaces

KNOWN BUGS/LIMITATIONS

The program keeps records of whether network interfaces are up or down. Under exceptional circumstances these records can become inconsistent with the real states of the interfaces. For example, an interface that was brought up using ifup and later deconfigured using ifconfig will still be recorded as up. To fix this you can use the −−force option to force ifup or ifdown to run configuration or deconfiguration commands despite what it considers the current state of the interface to be.

The file /etc/network/run/ifstate must be writable for ifup or ifdown to work properly. If that location is not writable (for example, because the root filesystem is mounted read-only for system recovery) then /etc/network/run/ifstate should be made a symbolic link to a writable location. If that is not possible then you can use the −−force option to run configuration or deconfiguration commands without updating the file.

Note that the program does not run automatically: ifup alone does not bring up interfaces that appear as a result of hardware being installed and ifdown alone does not bring down interfaces that disappear as a result of hardware being removed. To automate the configuration of network interfaces you need to install other packages such as hotplug(8) or ifplugd(8).

AUTHOR

The ifupdown suite was written by Anthony Towns <aj@azure.humbug.org.au>.

SEE ALSO

interfaces(5), ifconfig(8).



ifdown(8)