How to set up a static IP address on Debian 10?

First, it is necessary to know which network interface we are going to configure. For this example, I will assume that we will configure the wired network interface.

Then, we verify the name of the interface with the following command:

:~$ ip addr show

The output will be something similar to this one:

1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
       valid_lft forever preferred_lft forever
    inet6 ::1/128 scope host 
       valid_lft forever preferred_lft forever
2: enp0s3: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP group default qlen 1000
    link/ether 08:00:27:33:07:93 brd ff:ff:ff:ff:ff:ff
    inet 192.168.1.15/16 brd 192.168.1.255 scope global dynamic enp0s3
       valid_lft 86277sec preferred_lft 86277sec
    inet6 fdd4:a148:ea1:7a00:a00:27ff:fe33:793/64 scope global dynamic mngtmpaddr 
       valid_lft 7078sec preferred_lft 3478sec
    inet6 fe80::a00:27ff:fe33:793/64 scope link 
       valid_lft forever preferred_lft forever

There we will have the name of the network interfaces. The one that corresponds to the wired network is called enp0s3. Something similar should be in your case.

And it has an IP address 192.168.1.15. However, I always want the address to be 192.168.1.99.

Now that we know the name of the interface, we need to edit the file /etc/network/interfaces.

:~$ sudo nano /etc/network/interfaces

On the line:

iface enp0s3 inet dhcp

It says that it will configure the interface with DHCP i.e. for a dynamic IP address. It has to be changed to configure it in a static way. So, change it for this line:

iface enp0s3 inet static

The following connection parameters should then be added.

• Address
• Netmask
• Network
• Broadcast
• Gateway

address 192.168.1.99
netmask 255.255.255.0
network 192.168.1.1
broadcast 192.168.1.255
gateway 192.168.1.1

Remember that these parameters are as an example. You need to type the corresponding ones to your network.

Next, restart the network service

:~$ sudo systemctl restart networking

Then, check the changes:

:~$ ip addr show

So, everything was fine.

Conclusion

Setting up a static IP address on Debian 10 is quite simple. However, you must have root privileges to do this.

Ideally, you should have a static IP address for computers within an internal network to make them easier to handle.