NAME

       ifscheme - scheme control for network interfaces

SYNOPSIS

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

       mapping <interface> script ifscheme-mapping

DESCRIPTION

       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.

OPTIONS

       -v

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

       -l

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

       newscheme

       -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 -.

CONFIGURATION

       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
            address 192.168.1.5
            netmask 255.255.255.0
            gateway 192.168.1.1

       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
            address 192.168.1.5
            netmask 255.255.255.0
            gateway 192.168.1.1

         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.

FILES

       /etc/network/interfaces
              the interfaces definition file

       /etc/network/run/scheme
              the current scheme

       /etc/network/run/ifstate
              a record of the current state of the interfaces, managed by ifup and ifdown

BUGS

       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.

SEE ALSO

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

DISTRIBUTION

       Redistribution is subject to the GNU public license.

AUTHORS

       Joey Hess <joey@kitenet.net>, Peter Wilson <pwilson@cs.hmc.edu>

                                                                                                     IFSCHEME(8)