How To Change From Static To Dynamic Ip

Ubuntu eighteen.04 LTS has switched to Netplan for configuring network interfaces. Netplan is based on YAML based configuration arrangement that makes configuration procedure very simple. Netplan has replaced the old configuration file /etc/network/interfaces that nosotros previously used for configuring network interfaces in Ubuntu.

In this article, nosotros will learn how to configure networking in Ubuntu using Netplan. We will run into both static and dynamic IP configuration. I will use Ubuntu 18.04 LTS to depict the procedure mentioned in this commodity.

Network configuration using Netplan

Y'all can detect the new configuration files at /etc/netplan/*.yaml. Ubuntu server generates Netplan configuration file for system-networkd named 01-netcfg.yaml, while Ubuntu desktop generates a Netplan configuration file for Network-Manager named 01-network-managing director-all.yaml.

As I am working on Ubuntu desktop, I have 01-network-managing director-all.yaml file in my /etc/netplan directory for network configuration. 01-network-managing director-all.yaml is used to configure the first interface. If you take multiple interfaces, utilize 02-network-manager-all.yaml for the 2nd interface. Netplan applies the configuration in the numerical order. That means 01 file will be applied earlier the 02 file.

Now let's move towards network configuration. Follow the steps beneath to configure static or dynamic IP addressing in Ubuntu:

1. Showtime, discover the name of the active network interfaces that you want to configure. To practise so run the post-obit command:

$ ip a

IP command

Annotation the interface name that you desire to configure using Netplan.

2. The Netplan default configuration file is nether the directory /etc/netplan. You can find that using the post-obit command:

$ ls /etc/netplan/

Netplan configuration file

3. To view the content of Netplan network configuration file, run the post-obit command:

$ cat /etc/netplan/*.yaml

Content of the Netplan network config file

4. Now you will need to open the configuration file in any editor: As I am using Nano editor to edit the configuration file, and then I will run:

$ sudo nano /etc/netplan/*.yaml

Edit the network configuration

5. Update the configuration file every bit per your networking needs. For static IP addressing, add together the IP address, Gateway, DNS information while for dynamic IP addressing, there is no need to add together this information as it will get this information from DHCP server. Employ the following syntax to edit the configuration file.

network:     Version: 2     Renderer: NetworkManager/ networkd     ethernets:        DEVICE_NAME:           Dhcp4: yes/no           Addresses: [IP_ADDRESS/NETMASK]           Gateway: GATEWAY           Nameservers:              Addresses: [NAMESERVER_1, NAMESERVER_2]

Where

DEVICE_NAME: Proper noun of the interface.

Dhcp4: aye or no depending upon dynamic or static IP addressing

Addresses: IP address of the device in prefix notation. Exercise not use netmask.

Gateway: Gateway IP address to connect to an outside network

Nameservers: Accost of DNS name servers

Notation that Yaml files are rather strict in the indentation. Make use of spaces for indentation, not tabs. Otherwise, you will encounter an fault.

Configure static IP accost in Ubuntu

To manually configure an IP address, use the above configuration file syntax and add the IP accost, Gateway, and DNS server information. Here you can come across my configuration file for static IP addressing:

IP address configuration

Configure Dynamic IP address in Ubuntu

To obtain IP addressing from the DHCP server, use the aforementioned above configuration file syntax. Merely do not add the IP address, Gateway, and DNS server information.

Here yous tin see my configuration file for dynamic IP addressing:

Ubuntu DHCP Configuration for Network card

Once yous accept washed with the static or dynamic IP configuration, save, and go out the configuration file.

Testing configuration

Earlier applying any changes, we will test the configuration file. Run the following command as sudo to test configurations:

$ sudo netplan try

Test config with netplan try command

If there is no issue, information technology will return the configuration accepted message. If the configuration file fails the test, it will be reverted to a previous working configuration.

Utilize configuration

Now apply the new configurations past running the following command as sudo:

$ sudo netplan utilise

In example you see whatever error, try debugging to investigate the problem. To run debug, use the following command as sudo:

$ sudo netplan –d apply

Restart the network service

Once all the configurations are successfully applied, restart the Network-Director service past running the post-obit command:

$ sudo systemctl restart network-director

If you are using a Ubuntu Server, instead use the following command:

$sudo systemctl restart system-networkd

Verify IP accost

Now to verify if the new configurations are successfully practical, run the following command to verify the IP accost:

$ ip a

Whether yous have an Ubuntu server or desktop, you tin simply use Netplan to configure static or dynamic IP addressing without needing any complex configuration.