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August 2004
Aliases: ifdown(8), ifdown(8), ifdown(8), ifdown(8), ifquery(8)


high level tools to configure network interfaces


Scripts to bring up network interfaces and legacy utilities


Network Interface Management tool similar to ifupdown


Legacy scripts for manipulating of network devices


Network configuration infrastructure


ifup - start a pre-configured network interface.
ifdown - stop a (pre-configured) network interface.
ifstatus - show the state of a (pre-configured) network interface.
ifprobe - checks if the configuration for the interface has changed


if{up,down,status,probe} [ <configuration-name> ] <interface> [-o options ]


We use the terms configuration, interface and device in a dedicated way. A device is always a piece of hardware representing a network interface, a PCI or PCMCIA card or a USB device. An interface then is the name of the network interface it gets from the kernel, when the device has been registered. A configuration is a set of parameters which can be assigned to an interface like IP addresses or routes.


ifup is used to bring up a pre-configured interface for networking. It is usually invoked by the network script at boot time or by the PCMCIA/hotplug system. It can also be used to start interfaces manually on the command line. It activates the link, adds addresses and other parameters and sets up the routes for an interface.
Former iprenew operation is performed upon each successfull ifup call.
ifdown is used to set down the interface and flush all its addresses. It is possible to let ifdown check the interface if it is still used before setting it down. If configured it may then get rid of the using processes or refuse setting it down. Have a look at /etc/sysconfig/network/config to enable this feature.
ifstatus checks if the interface and its routes were set up properly.
ifprobe checks if any of the configuration files for this interface have been changed since the interface is up.
<interface> is the network interface name.
The network interface names of physical network devices are assigned by the kernel and may be modified by udev(7) rules.
<configuration-name> This optional parameter exists for compatibility reasons only and is not used.


The following are options to be specified after the -o switch.
debug Be verbose.
quiet Silent mode. Feedback only via return code.
force Applicable to ifdown only. Forces persistent (nfsroot type) interface down.


The script itself.
General configuration options. See section GENERAL VARIABLES below.
/etc/sysconfig/network/ifcfg- <configuration-name>
The files containing the configuration of the devices. An example that shows a typical configuration with the name ifcfg-eth0:

/etc/sysconfig/network/ifroute- <configuration-name>
You can specify individual routes for every configuration in these files. See routes (5) for a detailed description.


There are some general settings in the file /etc/sysconfig/network/config. If needed you can also set most of the general variables as an individual variable in the ifcfg-* files. Please see the description of these variables in /etc/sysconfig/network/config.
For dhcp there are additional global options in /etc/sysconfig/network/dhcp. Also these are described there and can be used individually in ifcfg-* files.


ifstatus interface
wicked generates debug output when called with debug option set to a particular facility (e.g. all). Please use it, when something wrong is happening.


Copyright (C) 2014 SUSE LINUX Products GmbH, Nuernberg, Germany.



Pawel Wieczorkiewicz
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