👤
Home Man
Search
Today's Posts
Register

Linux & Unix Commands - Search Man Pages
Man Page or Keyword Search:
Select Section of Man Page:
Select Man Page Repository:

Linux 2.6 - man page for ifdown (linux section 8)

ifup(8) 										  ifup(8)

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) net-
       work 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.

       -e PATTERN, --exclude=PATTERN
	      Exclude interfaces from the list of  interfaces  to  operate  on	by  the  PATTERN.
	      Notice  that  the  PATTERN  can  be  a full interface name or substrings that match
	      interfaces. Users could easily have unexpected behaviour if they use a small string
	      to do the match.

       -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 ip to do its dirty work.

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

       /var/run/network/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  inter-
       faces.	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 /var/run/network/ifstate must be writable for ifup or ifdown  to  work	properly.
       On  Ubuntu  the	/var/run  location is a temporary filesystem which is always writable and
       thrown away on shutdown.  You can also 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 configu-
       ration 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), ip(8), ifconfig(8).

IFUPDOWN				   22 May 2004					  ifup(8)


All times are GMT -4. The time now is 11:45 AM.

Unix & Linux Forums Content Copyrightę1993-2018. All Rights Reserved.
×
UNIX.COM Login
Username:
Password:  
Show Password