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example etc/network/interfaces config
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# always start with interface up | |
auth eth0 | |
# Static | |
iface eth0 inet static | |
address 192.168.1.5 | |
netmask 255.255.255.0 | |
gateway 192.168.1.254 | |
dns-nameservers 192.168.1.250 | |
# DHCP | |
auto eth0 | |
iface eth0 inet dhcp | |
#Examples: How to set up interfaces | |
#Please read our previous | |
#How to: Ubuntu Linux convert DHCP network configuration to static IP configuration for more information. | |
#Following is file located at /usr/share/doc/ifupdown/examples/network-interfaces, use this file as reference (don't forget interfaces man pages for more help): | |
###################################################################### | |
# /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. | |
###################################################################### | |
# We always want the loopback interface. | |
# | |
# 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 | |
# network 192.168.0.0 | |
# netmask 255.255.255.0 | |
# broadcast 192.168.0.255 | |
# gateway 192.168.0.1 | |
# A more complicated ethernet setup, with a less common netmask, and a downright | |
# weird broadcast address: (the "up" lines are executed verbatim when the | |
# interface is brought up, the "down" lines when it's brought down) | |
# | |
# auto eth0 | |
# 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 | |
# A more complicated ethernet setup with a single ethernet card with | |
# two interfaces. | |
# Note: This happens to work since ifconfig handles it that way, not because | |
# ifup/down handles the ':' any differently. | |
# Warning: There is a known bug if you do this, since the state will not | |
# be properly defined if you try to 'ifdown eth0' when both interfaces | |
# are up. The ifconfig program will not remove eth0 but it will be | |
# removed from the interfaces state so you will see it up until you execute: | |
# 'ifdown eth0:1 ; ifup eth0; ifdown eth0' | |
# BTW, this is "bug" #193679 (it's not really a bug, it's more of a | |
# limitation) | |
# | |
# auto eth0 eth0:1 | |
# iface eth0 inet static | |
# address 192.168.0.100 | |
# network 192.168.0.0 | |
# netmask 255.255.255.0 | |
# broadcast 192.168.0.255 | |
# gateway 192.168.0.1 | |
# iface eth0:1 inet static | |
# address 192.168.0.200 | |
# network 192.168.0.0 | |
# netmask 255.255.255.0 | |
# "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: | |
# | |
# if [ -r ./shared ] ; then . ./shared ; else . /etc/pcmcia/shared ; fi | |
# get_info $DEVICE | |
# case "$ACTION" in | |
# 'start') | |
# /sbin/ifup $DEVICE | |
# ;; | |
# 'stop') | |
# /sbin/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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