From Rost Lab Open
# 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 iface eth0 inet manual # The trick here is that the interface is already configured during initramdisk time. Here we only want to run /etc/network/if-*.d scripts to bring up NFS mounts for example, but NOT to configure the interface itself.