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IFUP(8)                      Network configuration                     IFUP(8)

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

       if{up,down,status,renew,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  PCM-
       CIA/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.

       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/net-
       work/config to enable this feature.

       ifstatus checks if the interface and its routes were set up properly.

       ifrenew  is used to renew the dhcp lease on the desired interface with-
       out shutting the interface down. It  only  restarts  the  corresponding
       dhcpcd or dhclient process.

       ifprobe  checks  if  any  of the configuration files for this interface
       have been changed since the interface is up. Checked files are the cor-
       responding  ifcfg-*,  ifroute-*,  ifservices-* and common configuration
       files config, dhcp and routes.

       <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; see the PERSISTENT
       INTERFACE NAMES section.

       <configuration-name> is the optional parameter with the name of a  con-
       figuration, that should be used to set up the interface. Every configu-
       ration is stored in files below /etc/sysconfig/network which are  named
       ifcfg-<configuration-name>.   By default, the interface name is used as
       configuration name. The parameter exists for compatibility reasons, but
       may be also used to circumvent this fixed relation.

       The support for persistent interface names for physical network devices
       using ifcfg-<hardware-description> configuration files is removed  from
       sysconfig since openSUSE 10.3. Instead, an automatic assignment of per-
       sistent interface names is implemented using udev(7) rules.

       When a network device driver is loaded, the  kernel  assigns  the  next
       currently free interface name to it. For built-in devices there is most
       of the time a fixed relation between devices and interfaces,  but  this
       is  no  longer  the  case  when  using hot-pluggable devices. With such
       devices (like PCMCIA or USB) you cannot  always  know  which  interface
       name  it will get - it depends for example on the order the devices got
       plugged in.

       The network interface assigned in the kernel is reported  to  the  udev
       daemon.   When a device appears the first time, the udev persistent net
       generator rule creates a rule matching the device, by default using the
       hardware (MAC) address, that renames the interface name assigned by the
       kernel to one, that is not used in any another rule and thus unique for
       the  device.  This rule is appended to the persistent net rule file and
       executed. When the same device appears in the  system  next  time,  the
       generated rule renames the interface to the persistent name again.

       The  generated  persistent interface name rules can be adopted in yast2
       network module or by editing the rule file  directly.  Currently,  they
       are  stored  in the /etc/udev/rules.d/70-persistent-net.rules udev rule

       The following are options to be specified after the -o switch.

       auto   Only set up the interface if the configuration  has  the  START-
              MODE=auto (or boot, onboot or hotplug.)

              Alias for 'auto'.

              Like  auto,  but  do  some extra jobs, because hotplug indicates
              that the interface was just  (un)registered.  These  extra  jobs
              contain  (if  configured):  starting/stopping  ifplugd, renaming
              interface and removing all status files at ifdown.

       manual This is default operation  mode  and  sets  up  interfaces  with
              STARTMODE=manual.  If  option  'rc'  is  used which implies mode
              'auto', you can force mode 'manual'.

       rc     Special option for the use  in  rcnetwork (/etc/init.d/network).
              See section rcnetwork below.

       dhcp   Indicates that script is called from dhcp client.  When a inter-
              face has BOOTPROTO=dhcp ifup/down  does  not  execute  any  post
              action  immediately.   After dhcp client got a lease and has set
              ip address, it calls ifup again, this time with  option  'dhcp'.
              In this run we finish interface setup.

       nodeps If  there  are  interfaces based on this interface, ifdown takes
              these depending interfaces down first. If you don't  like  that,
              use 'nodeps'.

              Use provider <n> instead that from config file. Only usefull for
              dialup interfaces.

       debug  Be verbose.

              With nosyslog the scripts don't send messages to syslog even  if
              the  configuration  variable USE_SYSLOG is set to "yes". This is
              default for ifstatus only.  If you want also  ifstatus  messages
              send to syslog then call it with syslog.

              The script itself.
              General  configuration  options.  See  section GENERAL VARIABLES
       /etc/sysconfig/network/ifcfg- <configuration-name>
              The files containing the configuration of the devices.  An exam-
              ple 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.
              Scripts in these directories will be executed when any interface
              is started, if-up.d, and when  any  interface  is  stopped,  if-
              down.d.  They  have to be executable and may also be binary. The
              execution of these  programs  is  controlled  by  the  variables
              GLOBAL_POST_UP_EXEC and GLOBAL_PRE_DOWN_EXEC in the network con-
              figuration  file  /etc/sysconfig/network/config  These  are  not
              interface  specific,  and  can have any name. If you need inter-
              face/configfile specific scripts to be executed have a  look  at
              PRE_UP_SCRIPT,         POST_UP_SCRIPT,        PRE_DOWN_SCRIPTand
       /etc/sysconfig/network/ifservices- <configuration-name>/
              If you don't have a permanent network connection and  like  that
              certain  services  are  not started at boot time unconditionally
              but later after the network connection was established then  you
              can  add  these services here. See ifservices (5) for a detailed
              A template for writing ifcfg-* files.

       There are some general settings in the file /etc/sysconfig/network/con-
       fig.   If needed you can also set every general variable as an individ-
       ual 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/net-
       work/dhcp.  Also these are described there and can be used individually
       in ifcfg-* files.

rcnetwork (/etc/init.d/network)
       At  boot  time  network devices are initialized asynchronously via hot-
       plug. Once this initialization process registered an interface  for  it
       this will also trigger a hotplug event which will call ifup. If service
       network was still not started ifup will just exit. As soon  as  service
       network is active ifup will do its job and set up the interface. There-
       fore the job of the network start script consists of:
       - set the 'network active' flag
       - set up all interfaces already available
       - wait for mandatory interfaces which are still not there
       - set up tunnel, vlan, et al.

       At boot time the scripts tries  to  determine  the  list  of  mandatory
       devices   automatically.  It  considers  all  interfaces  that  have  a
       startmode 'auto' or 'onboot' as mandatory. Normally it waits 20 seconds
       for them and exits then with failed is any mandatory interface is still

       Alternatively you may specify all mandatory  devices  manually  in  the
       variable MANDATORY_DEVICES in the file.  /etc/sysconfig/network/config.
       There you may also tweak the timeout in WAIT_FOR_INTERFACES.

       The network script will only set up devices with with startmodes  auto,
       onboot  or  hotplug.  To  set up an interface with startmode manual you
       have to call ifup manually. (rcnetwork calls 'ifup ... -o rc').

       ifstatus interface

       ifup and rcnetwork write status files in  /dev/.sysconfig/network.   If
       something went completely wrong this files might be interesting.

       Please report bugs at <http://www.suse.de/feedback>

       Christian Zoz <zoz@suse.de> -- ifup script
       Michal Svec <msvec@suse.cz> -- ifup script
       Bjoern Jacke -- ifup script
       Mads Martin Joergensen <mmj@suse.de> -- ifup manual page
       Michal Ludvig <mludvig@suse.cz> -- tunnel support

       ifcfg(5), routes(5), ifservices(5), ifcfg-wireless(5), ifcfg-tunnel(5),
       ifcfg-vlan(5), ifcfg-bonding(5), getcfg(8).

sysconfig                         August 2004                          IFUP(8)

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