Adding IP to an interface

Last Blog Review →

In the last blog we understood, the importance of network interface multiple tools used in linux to query the network configuration.

What does Adding ip to an interface is ?

Adding an IP address to an interface in Linux essentially means assigning a unique network identifier to a specific network device on the system. This allows the Linux machine to communicate on a network using that particular address.

Way of assigning IP address to an interface ?

1. DHCP

2. Static assignment

DHCP -

1. dhclient -

   If we are connected to a network with DHCP server running, then dhclient command can get the IP address for the machine interface

dhclient <interface>

2. /etc/network/interfaces

   We can make change to “/etc/network/interfaces“ file for the interface to be bring up on boot and obtain DHCP IP

auto eth0
iface eth0 inet dhcp

Static Configuration -

1. Permanent change

   If we want to statically configure the interface settings we could do in the /etc/network/interfaces file.

    auto eth0 #Bring up the interface on boot
    iface eth0 inet static
        address 1.1.1.1
        netmask 255.255.0.0
        gateway 1.0.0.0
        dns-nameservers 10.1.1.1
        dns-nameservers 10.2.2.2
   

   This change remains after the reboot too.

2. Temporary change

   A static IP address could be added on an interface using ifconfig

    ifconfig <interface> <ip-address/mask> up
   

Conclusion →

In this blog we understood, what is meaning of Adding ip to an interface, how to do it. DHCP can add IP address to an interface and static assignment.