Set a static IP address

Having a static ip could be useful for headless servers for example. I personally use NetworkManager to handle my connections, so this post will mainly focus on this program, but in case you want to use systemd-networkd for the same purpose, please check How to switch from Network Manager to systemd-networkd, since there is also an example on how to do the same as here.

Let’s proceed by checking the status of our service:

$ sudo systemctl status NetworkManager

Which outputs:

● NetworkManager.service - Network Manager
     Loaded: loaded (/usr/lib/systemd/system/NetworkManager.service; enabled; vendor preset: disabled)
    Drop-In: /usr/lib/systemd/system/NetworkManager.service.d
             └─NetworkManager-ovs.conf
     Active: active (running) since Wed 2021-12-29 11:06:29 CET; 5h 13min ago
       Docs: man:NetworkManager(8)
   Main PID: 534 (NetworkManager)
      Tasks: 3 (limit: 38135)
     Memory: 15.3M
        CPU: 1.353s
     CGroup: /system.slice/NetworkManager.service
             └─534 /usr/bin/NetworkManager --no-daemon

Check current ip address

We have already done this here, but in summary:

$ hostname -i

Check current connection

Let’s have a look at our active connections:

$ nmcli connection show

And its output:

NAME      UUID                                  TYPE      DEVICE 
wired     fa19249d-d349-37ca-b115-b6a7b4fb8639  ethernet  enp3s0 
wireless  855ecace-1f68-46f3-99eb-c18dd26d4636  wifi      --

Configure connection

We are going to configure ALL the involved part of our network connection.

IP address

$ nmcli con modify fa19249d-d349-37ca-b115-b6a7b4fb8639 ipv4.addresses 192.168.1.25/24

Gateway

$ sudo nmcli con modify fa19249d-d349-37ca-b115-b6a7b4fb8639 ipv4.gateway 192.168.1.1

DNS

$ sudo nmcli con modify fa19249d-d349-37ca-b115-b6a7b4fb8639 ipv4.dns "192.168.1.1"

Method

$ sudo nmcli con modify fa19249d-d349-37ca-b115-b6a7b4fb8639 ipv4.method manual

Activate connection

$ sudo nmcli connection up fa19249d-d349-37ca-b115-b6a7b4fb8639

Configuration file

A configuration file has been generated after we set up everything, and could be checked here:

$ sudo cat /etc/NetworkManager/system-connections/wired.nmconnection 

[connection]
id=wired
uuid=fa19249d-d349-37ca-b115-b6a7b4fb8639
type=ethernet
autoconnect-priority=-999
interface-name=enp3s0
permissions=
timestamp=1640800022

[ethernet]
mac-address-blacklist=

[ipv4]
address1=192.168.1.25/24,192.168.1.1
dns=192.168.1.1;
dns-search=
method=manual

[ipv6]
addr-gen-mode=eui64
dns-search=
method=ignore

[proxy]

References