How to Change IP on Ubuntu, Debian, and CentOS: A Step-by-Step Guide

• 20 August 2024
• ThunderVM Team
• Information Technology, Linux

Changing the IP address on Linux systems like Ubuntu 18, 20, 22, 24, Debian 10, 11 ,12 and CentOS 7, 9 is a common task for network administrators and tech enthusiasts. Whether you need to switch to a static IP, configure a new network, or simply change your IP for testing purposes, this guide will walk you through the process on each of these popular distributions.

Why Change Your IP Address?

There are several reasons you might need to change your IP address:

– **Static IP Configuration**: To set up a server or ensure consistent access to your device on a network.

– **Network Troubleshooting**: To resolve conflicts with other devices on the network.

– **Testing and Development**: To simulate different network environments.

How to Change IP on Ubuntu 18, 20, 22, 24 and Debian 10, 11, 12

Ubuntu 18, 20, 22, 24 and Debian 10, 11, 12 use `netplan` (for recent versions) or `interfaces` for older versions. Here’s how to change the IP address using both methods.

Using Netplan (Ubuntu 18, 20, 22, 24 and Debian 10, 11, 12)

Edit the Netplan Configuration File

sudo nano /etc/netplan/01-netcfg.yaml

Locate the ethernets section and update the addresses, gateway4, and nameservers fields. For example:

network:
  version: 2
  renderer: networkd
  ethernets:
    eth0:
      dhcp4: no
      addresses:
        - 192.168.1.100/24
      gateway4: 192.168.1.1
      nameservers:
        addresses:
          - 8.8.8.8
          - 8.8.4.4

Apply the Changes:

sudo netplan apply

How to Change IP on CentOS 7 and Centos 9

CentOS 7 and Centos 9 use NetworkManager for network configuration. Here’s how to change the IP address on CentOS.

Using nmcli Command

List the Network Connections:

nmcli con show

Use the following command to change the IP, replacing eth0 with your interface name:

nmcli con mod eth0 ipv4.addresses 192.168.1.100/24 ipv4.gateway 192.168.1.1 ipv4.dns "8.8.8.8 8.8.4.4"
nmcli con mod eth0 ipv4.method manual

Restart the Network:

nmcli con up eth0

Using the Network Scripts

Edit the Network Interface Script:

sudo nano /etc/sysconfig/network-scripts/ifcfg-eth0

Modify or add the following lines:

BOOTPROTO=none
IPADDR=192.168.1.100
PREFIX=24
GATEWAY=192.168.1.1
DNS1=8.8.8.8
DNS2=8.8.4.4

Restart the Network Service:

sudo systemctl restart network

Changing the IP address on Linux distributions like Ubuntu 18, Ubuntu 20, Ubuntu 22, Ubuntu 24, Debian 10, Debian 11, Debian 12, CentOS 7 and Centos Stream 9 is straightforward when you know the correct commands and configuration files. Whether you’re using netplan, interfaces, or nmcli, this guide provides the steps needed to ensure your system is correctly configured. Regularly updating and managing your IP settings can improve network performance, security, and overall system functionality.

If you found this guide helpful, don’t forget to share it with others who might benefit from it!