Routing problem : two interfaces one gateway

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Network interfaces problem

LEARN ABOUT DEBIAN

ifscheme-mapping

IFSCHEME(8)							     Commands							       IFSCHEME(8)

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 inter-
       faces(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 inter-
       face>-<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 suc-
       cessfully 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)

IP Networking