root@ubuntu1:~# more /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 #iface eth0 inet dhcp iface eth0 inet static address 10.211.55.21 gateway 10.211.55.1 netmask 255.255.255.0 network 10.211.55.0 broadcast 10.211.55.255 # This is an autoconfigured IPv6 interface iface eth0 inet6 auto