Configure Network Settings in Debian

How to setup a static IP address and configure network settings in Debian 11 (Bullseye)

List Network Interfaces

# List Network Interfaces

ip link show

Configure Network Settings

In Debian, the network is configured using the /etc/network/interfaces file. You can edit the file to configure a static IP address, subnet mask and default gateway.

This is what the default /etc/network/interfaces file looks like:

# Edit the /etc/network/interfaces file

nano /etc/network/interfaces 

Change the interface from DHCP to static, enter the IP address, subnet mask and default gateway.

# The primary network interface
allow-hotplug eth0
iface eth0 static
address 192.168.1.26
netmask 255.255.255.0
gateway 192.168.1.1 

When you've finished editing the file, it should look something like this:

Restart networking

# Restart networking

/etc/init.d/networking restart

Show network configuration

# Show the current network configuration

ip address show

Bring up the network interface

# Change state of network interface eth0 to up

ifup eth0

Test the network

Test the network settings by pinging the server's IP address

ping 192.168.1.26