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       ifscheme - scheme control for network interfaces


       ifscheme [-v] [[-s] newscheme]

       mapping <interface> script ifscheme-mapping


       ifscheme allows you to change network configuraton schemes or query the
       current  scheme.  It  integrates   with   the   ifup(8)   command   and
       interfaces(5).   For example, you might use this program to configure a
       "home" scheme and a "work" scheme for a network  device  on  a  laptop.
       When  you  move between home and work, a simple command can reconfigure
       your networking.

       If you run the program with  no  parameters,  it  will  tell  what  the
       current network scheme is.

       The  ifscheme-mapping  utility  is  used  to  tell  the ifup and ifdown
       utilities about the current scheme.



              Run in verbose mode. This is passed in to the  ifup  and  ifdown
              programs as well.


       --list list all schemes available/defined in /etc/network/interfaces.


       -s newscheme

       --scheme newscheme
              Change  to  a new network configuration scheme.  When the scheme
              is changed, network interfaces that were using  the  old  scheme
              will  be  taken  down  and  brought  back  up  to  use  the  new
              configuration scheme. -s or --scheme are mandatory if  newscheme
              begins with a -.


       To  make  the program do anything useful when a scheme is selected, you
       must edit /etc/network/interfaces to add a mapping  for  the  interface
       (or  interfaces)  that can be controlled on a per-scheme basis. Suppose
       you want to control eth0 in this way. You might have an  existing  eth0
       configuraton in there, such as:

         auto eth0

         iface eth0 inet static

       To  change  this  so  you  can  chose  between static routing and dhcp,
       replace it with the following (it helps to ifdown the interface first).

         auto eth0

         mapping eth0
            script ifscheme-mapping

         iface eth0-home inet static

         iface eth0-work inet dhcp

       Now  if  you run "ifscheme home" and ifup the interface, you'll get the
       eth0-home configuration stanza. If you run "ifscheme work", it will  be
       changed  to  the  eth0-work  stanza.  You can add additional stanzas as
       desired,  but  the  label  must  always  be  of  the   form   <hardware
       interface>-<scheme name>.

       If  you  have  a  second  interface (perhaps a wireless network card on
       eth1), you can duplicate the above for  that  interface,  changing  the
       eth0  and the configuration details as appropriate, but remember to add
       an iface stanza for every scheme name for the second interface.


              the interfaces definition file

              the current scheme

              a record of the current state of the interfaces, managed by ifup
              and ifdown


       All schemed interfaces will have the same scheme.

       Any  schemed  interface  which  does  not have an entry for the current
       scheme and is not configured when the scheme is  changed  will  not  be
       successfully configured when it is brought up.


       interfaces(5) ifup(8) ifdown(8)


       Redistribution is subject to the GNU public license.


       Joey Hess <>, Peter Wilson <>