dhcp_configure

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
auto eth0
allow-hotplug eth0
iface eth0 inet dhcp

auto eth1
iface eth1 inet static
      address 10.10.100.42
      netmask 255.255.255.0
      gateway 10.10.100.254