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######################################################################
# /etc/network/interfaces -- configuration file for ifup(8), ifdown(8)
#
# 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 "pre-up", "up", "down" and "post-down" options are valid for all
# interfaces, and may be specified multiple times. All other options
# may only be specified once.
#
# See the interfaces(5) manpage for information on what options are
# available.
######################################################################
# The loopback interface isn't really required any longer,
# but can be used if needed.
#
# auto lo
# iface lo inet loopback
# An example ethernet card setup: (broadcast and gateway are optional)
#
# auto eth0
# iface eth0 inet static
# address 192.168.0.42/24
# gateway 192.168.0.1
# An example IPv6 setup:
#
# auto eth0
# iface eth0 inet6 static
# address fec0::42/64
# gateway fec0::1
# Multiple addresses can be added by simply using multiple iface stanzas.
# This also allows you to add both IPv4 and IPv6 addresses to the same
# interface:
#
# auto eth0
# iface eth0 inet static
# address 192.168.0.42/24
# gateway 192.168.0.1
# iface eth0 inet static
# address 172.16.0.1/24
# iface eth0 inet6 static
# address fec0::42/64
# gateway fec0::1
# For more complicated configurations, for example adding more routes,
# you can use the "up" and "down" lines to have commands executed when the
# interface is brought up resp. down:
#
# auto eth0
# iface eth0 inet static
# address 192.168.1.42/25
# up ip route add 192.168.1.128/25 via 192.168.1.2 onlink dev $IFACE
# down ip route del 192.168.1.128/25 via 192.168.1.2 onlink dev $IFACE
# "pre-up" and "post-down" commands are also available. In addition, the
# exit status of these commands are checked, and if any fail, configuration
# (or deconfiguration) is aborted. So:
#
# auto eth0
# iface eth0 inet dhcp
# pre-up [ -f /etc/network/local-network-ok ]
#
# will allow you to only have eth0 brought up when the file
# /etc/network/local-network-ok exists.
# Two ethernet interfaces, one connected to a trusted LAN, the other to
# the untrusted Internet. If their MAC addresses get swapped (because an
# updated kernel uses a different order when probing for network cards,
# say), then they don't get brought up at all.
#
# auto eth0 eth1
# iface eth0 inet static
# address 192.168.42.1
# netmask 255.255.255.0
# pre-up /path/to/check-mac-address.sh eth0 11:22:33:44:55:66
# pre-up /usr/local/sbin/enable-masq
# iface eth1 inet dhcp
# pre-up /path/to/check-mac-address.sh eth1 AA:BB:CC:DD:EE:FF
# pre-up /usr/local/sbin/firewall
# Two ethernet interfaces, one connected to a trusted LAN, the other to
# the untrusted Internet, identified by MAC address rather than interface
# name:
#
# auto eth0 eth1
# mapping eth0 eth1
# script /path/to/get-mac-address.sh
# map 11:22:33:44:55:66 lan
# map AA:BB:CC:DD:EE:FF internet
# iface lan inet static
# address 192.168.42.1
# netmask 255.255.255.0
# pre-up /usr/local/sbin/enable-masq $IFACE
# iface internet inet dhcp
# pre-up /usr/local/sbin/firewall $IFACE
# A PCMCIA interface for a laptop that is used in different locations:
# (note the lack of an "auto" line for any of these)
#
# mapping eth0
# script /path/to/pcmcia-compat.sh
# map home,*,*,* home
# map work,*,*,00:11:22:33:44:55 work-wireless
# map work,*,*,01:12:23:34:45:50 work-static
#
# iface home inet dhcp
# iface work-wireless bootp
# iface work-static static
# address 10.15.43.23
# netmask 255.255.255.0
# gateway 10.15.43.1
#
# Note, this won't work unless you specifically change the file
# /etc/pcmcia/network to look more like:
#
# PATH="$PATH:/sbin:/usr/sbin"
# if [ -r ./shared ] ; then . ./shared ; else . /etc/pcmcia/shared ; fi
# get_info $DEVICE
# case "$ACTION" in
# 'start')
# ifup $DEVICE
# ;;
# 'stop')
# ifdown $DEVICE
# ;;
# esac
# exit 0
# An alternate way of doing the same thing: (in this case identifying
# where the laptop is is done by configuring the interface as various
# options, and seeing if a computer that is known to be on each particular
# network will respond to pings. The various numbers here need to be chosen
# with a great deal of care.)
#
# mapping eth0
# script /path/to/ping-places.sh
# map 192.168.42.254/24 192.168.42.1 home
# map 10.15.43.254/24 10.15.43.1 work-wireless
# map 10.15.43.23/24 10.15.43.1 work-static
#
# iface home inet dhcp
# iface work-wireless bootp
# iface work-static static
# address 10.15.43.23
# netmask 255.255.255.0
# gateway 10.15.43.1
#
# Note that the ping-places script requires the iproute package installed,
# and the same changes to /etc/pcmcia/network are required for this as for
# the previous example.
# Set up an interface to read all the traffic on the network. This
# configuration can be useful to setup Network Intrusion Detection
# sensors in 'stealth'-type configuration. This prevents the NIDS
# system to be a direct target in a hostile network since they have
# no IP address on the network. Notice, however, that there have been
# known bugs over time in sensors part of NIDS (for example see
# DSA-297 related to Snort) and remote buffer overflows might even be
# triggered by network packet processing.
#
# auto eth0
# iface eth0 inet manual
# up ifconfig $IFACE 0.0.0.0 up
# up ip link set $IFACE promisc on
# down ip link set $IFACE promisc off
# down ifconfig $IFACE down
# Set up an interface which will not be allocated an IP address by
# ifupdown but will be configured through external programs. This
# can be useful to setup interfaces configured through other programs,
# like, for example, PPPOE scripts.
#
# auto eth0
# iface eth0 inet manual
# up ifconfig $IFACE 0.0.0.0 up
# up /usr/local/bin/myconfigscript
# down ifconfig $IFACE down
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