auto eth0 iface eth0 inet dhcp

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when you type

 vi /etc/network/interfaces

on ubuntu server  you will find this line

auto eth0 
iface eth0 inet dhcp.

It means that the network interface has been set up to automatically reseove to DHCP(The Dynamic Host Configuration Protoco). If you are setting up a Domain name server -BIND.

if you see somthing like this which you are likely to see in accounts hosted  on cpanels or on digitalocean

iface eth0 inet static
 address 192.168.1.5
 netmask 255.255.255.0
 gateway 192.168.1.254

It means the physical interfaces  which is the  eth0 has been defined and is static.

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