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IFRENAME(8)                Linux Programmer's Manual               IFRENAME(8)

       ifrename - rename network interfaces based on various static criteria

       ifrename [-c configfile] [-p] [-d] [-u] [-v] [-V] [-D] [-C]
       ifrename [-c configfile] [-i interface] [-n newname]

       Ifrename  is a tool allowing you to assign a consistent name to each of
       your network interface.

       By default, interface names are dynamic, and each network interface  is
       assigned  the  first available name (eth0, eth1...).  The order network
       interfaces are created may vary. For built-in  interfaces,  the  kernel
       boot  time  enumeration may vary. For removable interface, the user may
       plug them in any order.

       Ifrename allow the user to decide what name a  network  interface  will
       have.  Ifrename can use a variety of selectors to specify how interface
       names match the network interfaces  on  the  system,  the  most  common
       selector is the interface MAC address.

       Ifrename  must  be  run  before interfaces are brought up, which is why
       it's mostly useful in various scripts (init,  hotplug)  but  is  seldom
       used  directly  by  the  user. By default, ifrename renames all present
       system interfaces using mappings defined in /etc/iftab.

       -c configfile
              Set the configuration file to be used (by  default  /etc/iftab).
              The  configuration file define the mapping between selectors and
              interface names, and is described in iftab(5).
              If configfile is "-", the configuration is read from stdin.

       -p     Probe (load)  kernel  modules  before  renaming  interfaces.  By
              default  ifrename  only  check  interfaces  already  loaded, and
              doesn't auto-load  the  required  kernel  modules.  This  option
              enables  smooth  integration  with  system  not  loading modules
              before calling ifrename.

       -d     Enable various Debian specific hacks.  Combined  with  -p,  only
              modules  for  interfaces specified in /etc/network/interface are

       -i interface
              Only rename the specified interface as opposed to all interfaces
              on the system. The new interface name is printed.

       -n newname
              When  used  with  -i, specify the new name of the interface. The
              list of mappings from the configuration file  is  bypassed,  the
              interface specified with -i is renamed directly to newname.  The
              new name may be a wildcard containing a single '*'.
              When used without -i, rename interfaces by using  only  mappings
              that  would  rename  them to newname.  The new name may not be a
              wildcard. This use of ifrename is discouraged,  because  ineffi-
              cient (-n without -i).  All the interfaces of the system need to
              be processed at each invocation, therefore in most  case  it  is
              not  faster  than  just  letting  ifrename  renaming all of them
              (without both -n and -i).

       -t     Enable name takeover support. This allow interface name swapping
              between two or more interfaces.
              Takeover  enable  an  interface  to  'steal' the name of another
              interface. This works only with kernel 2.6.X and  if  the  other
              interface  is  down.  Consequently,  this is not compatible with
              Hotplug. The other interface is assigned a random name, but  may
              be renamed later with 'ifrename'.
              The  number of takeovers is limited to avoid circular loops, and
              therefore some complex multi-way name  swapping  situations  may
              not be fully processed.
              In  any  case, name swapping and the use of this feature is dis-
              couraged, and you are invited to choose unique  and  unambiguous
              names for your interfaces...

       -u     Enable  udev  output  mode.  This  enables proper integration of
              ifrename in the udev framework, udevd(8) will  use  ifrename  to
              assign  interface names present in /etc/iftab.  In this mode the
              output of ifrename can be parsed  directly  by  udevd(8)  as  an
              IMPORT action. This requires udev version 107 or later.

       -D     Dry-run  mode. Ifrename won't change any interface, it will only
              print new interface name, if applicable, and return.
              In dry-run mode, interface name wildcards are not resolved.  New
              interface  name  is  printed,  even if it is the same as the old
              Be also aware that some selectors can only be read by root,  for
              example  those  based on ethtool), and will fail silently if run
              by a normal user. In other words, dry-run mode under a  standard
              user may not give the expected result.

       -V     Verbose  mode. Ifrename will display internal results of parsing
              its configuration file and querying  the  interfaces  selectors.
              Combined  with  the  dry-run option, this is a good way to debug
              complex configurations or trivial problems.

       -C     Count matching  interfaces.  Display  the  number  of  interface
              matched, and return it as the exit status of ifrename.
              The  number  of interfaces matched is the number of interface on
              the system for which a mapping was  found  in  the  config  file
              (which is different from the number of interface renamed).

       Jean Tourrilhes - jt@hpl.hp.com


       ifconfig(8), ip(8), iftab(5).

wireless-tools                 26 February 2007                    IFRENAME(8)

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