/etc/network/interfaces
This file describes the network interfaces available on your system
# and how to activate them. For more information, see interfaces(5).
# The loopback network interface
auto lo
iface lo inet loopback
# This is a list of hotpluggable network interfaces.
# They will be activated automatically by the hotplug subsystem.
mapping hotplug
       script grep
       map eth1
# The primary network interface
auto eth1iface eth1 inet static
       address xxx.xxx.xxx.xxx
       netmask 255.255.255.0
       network xxx.xxx.xxx.xxx
       broadcast xxx.xxx.xxx.xxx
       gateway xxx.xxx.xxx.xxx
       # dns-* options are implemented by the resolvconf package, if installed
       dns-nameservers xxx.xxx.xxx.xxx
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