How to use ifdown and ifup commands to Restart Network on Ubuntu 20.04 In Linux

Using systemctl to Restart Network on Ubuntu 20.04

Using nmcli to Restart Network on Ubuntu 20.04

Step 1: Install ifupdown Package

Use the below command to install the ifupdown package in the Ubuntu as it doesn’t come by default with Ubuntu

sudo apt install ifupdown -y

Install ifupdown Package

Step 2: Bring down the network interfaces using ifdown

Now, by using the below command, we will bring down all the network interfaces using ifdown. Execute the below command in the terminal.

sudo ifdown -a

Bring down the network interfaces using ifdown

Step 3: Bring up the network interface using ifup

After bringing down the interfaces, we can bring it back up using the ifup command. Execute the below command to bring up the network interfaces using ifup.

sudo ifup -a

Bring up the network interface using ifup

How to Restart Network on Ubuntu 20.04

In Linux, the Network is the backbone that enables communication between devices and the internet. Restarting the network on Ubuntu 20.04 is crucial for troubleshooting network issues or applying new configurations. This process involves refreshing network services and interfaces to ensure smooth connectivity. There are multiple methods to achieve this, including using systemctl to restart networking.service, using ifdown and ifup commands to bring down and bring up specific network interfaces, or utilizing nmcli to restart its service. Each method offers flexibility based on the user’s requirements and network setup.