# cat /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

# The primary network interface
allow-hotplug eth0
iface eth0 inet dhcp

auto dsl-provider
iface dsl-provider inet ppp
pre-up /sbin/ifconfig nas0 up # line maintained by pppoeconf
provider dsl-provider

auto nas0
iface nas0 inet manual