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Asked: 2024-09-25T03:18:53+05:30 In:

I’m having difficulty configuring Netplan on my Ubuntu system. I’ve followed the setup process, but it seems like my network connections aren’t functioning as expected. Can anyone provide guidance on how to troubleshoot or correctly set up a Netplan configuration? Any help would be appreciated!

I’ve been wrestling with Netplan on my Ubuntu setup, and it’s driving me a bit crazy. I thought I had everything under control when I followed the setup process, but my network connections just don’t seem to work the way they should. It’s frustrating, especially when I’m trying to get everything up and running for a new project.

So, here’s the deal: I’m running Ubuntu 20.04, and I’ve been trying to configure my Ethernet connection using Netplan. I’ve edited the YAML file in the `/etc/netplan/` directory, but I think I might have messed up somewhere. After applying the configuration changes with `sudo netplan apply`, my connection drops, and I can’t seem to get it back without rebooting, which is super inconvenient.

I initially set it up to use DHCP, thinking it would be a straightforward way to get online, but now I’m wondering if I should try a static IP instead. I did some research, and I found examples online that look perfect, but when I copy them over, it just doesn’t work for me. I even checked the syntax and indentation since I know that can be a problem with YAML files, but still no luck.

To add to the confusion, I’m not entirely sure how to check if the changes are taking effect. I’ve tried running `ip a` to see if I’ve got an IP address assigned, but it’s like the interface is in limbo. Sometimes it looks like it’s attempting to connect, but then it just fails.

Has anyone else gone through this and might have some tips or guidance on what I might be missing? Did I overlook any essential commands, or is there a particular way I should structure my YAML file? Any insight into logging or troubleshooting would be super helpful, too. I’m kind of at my wit’s end here, and I could really use a hand! Thanks in advance for any advice you might share!

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    2 Answers



    1. Netplan Help

      Netplan Configuration Issues

      It sounds like you’re having a rough time with Netplan. I’ve faced similar issues when starting out, so you’re definitely not alone!

      Check Your YAML File

      YAML can be pretty picky about formatting. Make sure your file has correct indentation (2 spaces is standard) and that the structure looks good. Here’s a simple example for DHCP:

      network:
    version: 2
    renderer: networkd
    ethernets:
        enp3s0:  # Make sure to replace this with your actual interface name
            dhcp4: true

      If you’re trying static IP, it might look something like this:

      network:
    version: 2
    renderer: networkd
    ethernets:
        enp3s0: 
            addresses:
              - 192.168.1.100/24  # Replace with your desired static IP
            gateway4: 192.168.1.1  # Your gateway IP
            nameservers:
                addresses:
                  - 8.8.8.8
                  - 8.8.4.4

      Applying Changes

      After editing the file, make sure to run sudo netplan apply. If the connection drops, check the logs to see what’s going wrong:

      journalctl -u systemd-networkd

      This command can show you logs related to networking and might give you clues about issues on what’s happening.

      Troubleshooting Steps

      Here are some quick tips for what to check after applying the configuration:

      • Run ip a to see if the interface has got an IP.
      • Try ping 8.8.8.8 to check if you can reach the internet.
      • Look at systemctl status systemd-networkd for any hints.

      Rebooting

      If you have to reboot to get your connection back after applying changes, that’s definitely odd. Consider if your network service is enabled: sudo systemctl enable systemd-networkd might help avoid the need to reboot.

      Final Thoughts

      Don’t hesitate to reach out to community forums with your YAML contents or any error messages you see—it might help others help you faster. You’re doing great by asking questions and seeking help, so keep it up!



    2. Dealing with Netplan on Ubuntu can indeed be tricky, especially when configurations don’t seem to take effect as expected. Since you’ve already tried DHCP and are considering switching to a static IP, it’s important to ensure that your YAML configuration file is structured correctly. For a basic Ethernet connection with DHCP, your configuration should look something like this:

      
network:
  version: 2
  ethernets:
    eth0:
      dhcp4: true

      If you decide to switch to a static IP, your configuration might change to something like this:

      
network:
  version: 2
  ethernets:
    eth0:
      dhcp4: no
      addresses:
        - 192.168.1.100/24
      gateway4: 192.168.1.1
      nameservers:
        addresses:
          - 8.8.8.8
          - 8.8.4.4

      Be sure to replace `eth0` with your actual interface name (check with `ip a`), and ensure proper indentation as YAML is sensitive to whitespace. After editing your YAML file, run `sudo netplan apply`, and then use `ip a` again to check if the changes were applied successfully. If your connection drops, consider checking the system logs with `journalctl -u systemd-networkd` for any errors that might indicate what’s wrong. This information could help you identify potential issues and refine your configuration. Don’t hesitate to seek community help on forums or Q&A sites where Ubuntu users can provide additional insights based on their experiences.


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