Restart Ubuntu network interfaces after editing interface in:
/etc/networks
and
/etc/network/interfaces

Shutdown interfaces: ifdown -a
Bring up interfaces with config: ifup -a

Done.



root@static-68-235-x-x:~# more /etc/networks
default         0.0.0.0
loopback        127.0.0.0
link-local      169.254.0.0
localnet        68.235.x.x

root@static-68-235-x-x:~# 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 eth2
iface eth2 inet static
        address 68.235.x.x
        netmask 255.255.255.248
        network 68.235.x.x
        broadcast 68.235.x.x
        gateway 68.235.x.x
        # dns-* options are implemented by the resolvconf package, if installed
        dns-nameservers 8.8.8.8
        dns-search cust.tzulo.com
root@static-68-235-x-x:~#