####################################################################### /etc/network/interfaces -- configuration file for ifup(8), ifdown(8)### !!!NOTE!!! THIS IS AN ALPHA RELEASE! DO NOT RELY ON IT!## Consider this the first draft of what I think the proper way to# configure interfaces is. It makes use of programs like ifconfig(8)# and dhcpcd(8), and can be called from /etc/init.d/networking,# /etc/pcmcia/network or the command line. It can configure and# deconfigure interfaces. In controlled environments it even works.# It's *very* subject to change, however. Some of the compulsory# options will become optional. Some of the optional ones might# become compulsory. Syntax might change. Features might disappear.# Bugs might disappear. The examples below are reasonably likely# to remain more or less correct. Maybe.#                                         -- ajt@debian.org### A "#" character in the very first column makes the rest of the line# be ignored. Blank lines are ignored. Lines may be indented freely.# A "\" character at the very end of the line indicates the next line# should be treated as a continuation of the current one.## The "noauto", "up", and "down" options are valid for all interfaces.# "up" and "down" may be specified multiple times, all other options# may only be specified once.####################################################################### We always want the loopback interface. Whether we want ifup/ifdown to# know about is another matter, perhaps.# iface lo inet loopback# An example ethernet card setup: (broadcast and gateway are optional)#iface eth0 inet static     address 192.0.2.254     network 192.0.2.0     netmask 255.255.255.0     broadcast 192.0.2.255iface eth1 inet static     address 192.1.2.23     network 192.1.2.0     netmask 255.255.255.0     broadcast 192.1.2.255	gateway 192.1.2.254        up route add -net 192.0.1.0 netmask 255.255.255.0 gw 192.1.2.45iface eth2 inet static     address 192.9.2.23     network 192.9.2.0     netmask 255.255.255.0     broadcast 192.9.2.255# A more complicated ethernet setup: (the "up" lines are executed verbatim# when the interface is brought up, the "down" lines when it's brought down)## iface eth0 inet static#     address 192.168.1.42#     network 192.168.1.0#     netmask 255.255.255.128#     broadcast 192.168.1.0#     up route add -net 192.168.1.128 netmask 255.255.255.128 gw 192.168.1.2#     up route add default gw 192.168.1.200#     down route del default gw 192.168.1.200#     down route del -net 192.168.1.128 netmask 255.255.255.128 gw 192.168.1.2# An ethernet DHCP client: (using the dhcpcd .deb)## iface eth0 inet dhcp# A more complicated DHCP client: (hostname and leasetime match the options# in the dhcpcd manpage)## iface eth0 inet dhcp#     hostname charisma#     leasetime 3600# A PCMCIA ethernet DHCP client:## iface eth0 inet dhcp#     noauto## (note, this won't work unless you specifically change the file