Ubuntu basic interfaces file for network config

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Network interfaces file for old Ubuntu

vi /etc/network/interfaces

# This file describes the network interfaces available on your system
# and how to activate them. For more information, see interfaces(5).

source /etc/network/interfaces.d/*

# The loopback network interface
auto lo
iface lo inet loopback

# The primary network interface
auto eth0
iface eth0 inet static
        address 192.168.0.10
        netmask 255.255.255.0
        gateway 192.168.0.254
        dns-nameservers 192.168.0.2 8.8.8.8

auto eth1
iface eth1 inet static
       address 1.1.1.1
       netmask 255.255.255.0