20 Static Configuration in Ubuntu with Netplan

Network Configuration in Ubuntu Using Netplan
- Ubuntu no longer uses /etc/network/interfaces for network configuration.
- Instead, it relies on Netplan, with files stored in /etc/netplan/.
- Netplan configurations are YAML-based and require precise indentation.
Finding and Editing Netplan Files
- ls /etc/netplan/ lists available Netplan configuration files.
- The default file is typically named 01-network-manager-all.yaml.
- Edit the file using sudo nano /etc/netplan/<filename>.yaml.
Setting a Static IP Address
- Under ethernets:, specify the network interface (e.g., ens18).
- Define addresses: with the desired IP address and subnet (e.g., 192.168.118.2/24).
- Indentation is crucial; incorrect spacing breaks the configuration.
Applying Network Changes
- Use sudo netplan apply to apply the new configuration.
- ip a verifies if the new IP address is assigned.
- Syntax errors in the Netplan file can prevent changes from taking effect.
Differences from Other Linux Systems
- Ubuntu’s Netplan is different from Kali’s /etc/network/interfaces.
- CentOS uses ifcfg-eth0 files instead of Netplan.
- Learning distribution-specific networking tools improves troubleshooting skills.