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Asked: 2024-09-26T02:20:42+05:30 In:

What steps can I take to resolve a bad dotted quad DNS error that I’m encountering on my Ubuntu system?

I’ve been trying to get my Ubuntu system up and running without any hiccups, but I’ve hit a wall with this pesky dotted quad DNS error that’s driving me nuts! I didn’t even know such a thing existed until it popped up, and now I’m stuck. My internet connection seems fine, but any attempt to resolve domain names just leaves me with this frustrating error message. It’s like trying to talk to someone who just won’t respond.

So, I’ve tried a few things that I found online, like restarting the networking service and pinging the DNS servers, but nothing seems to fix the issue. I even checked my `/etc/resolv.conf` file, and it looks okay with the DNS servers listed, but somehow, it just doesn’t feel right. I did some digging and read about how sometimes the router can be the culprit, so I rebooted that too. Still no luck.

I’m not the most tech-savvy person, but I’m not a total newbie either. I feel like I should at least know how to troubleshoot this! I’ve heard that flushing the DNS cache might help, but I have no clue how to go about that on Ubuntu. And what’s the deal with different DNS settings? Should I be using Google’s public DNS? Or is there something better out there?

Honestly, if anyone has been in a similar situation, I’d love to hear how you got things sorted out. Did you have to dig into some obscure settings, or was it something simple that I’m just overlooking? If you can share the steps you took to resolve this annoying dotted quad DNS issue, I’d really appreciate it. Debugging this alone is turning into a small nightmare, and I could really use some guidance to get my system back on track! Thanks in advance for any advice!

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    2 Answers

    1. It sounds like you’re dealing with a classic DNS resolution issue that can be quite frustrating. Firstly, before proceeding to troubleshoot further, check your `/etc/nsswitch.conf` file to ensure that DNS is set correctly. Look for a line like this:

      hosts: files dns

      This setup ensures that your system first checks local files (like /etc/hosts) before checking DNS servers. If that’s set up correctly, you may want to try flushing the DNS cache. On Ubuntu, you can do this using the command:

      sudo systemd-resolve --flush-caches

      If you’re still experiencing issues after this step, consider switching to Google’s public DNS for better reliability. You can add these to your `/etc/resolv.conf` file:

      nameserver 8.8.8.8
nameserver 8.8.4.4

      Make sure to use a command like `sudo systemctl restart systemd-resolved` to restart the DNS resolver service after making these changes. Also, consider checking your firewall settings, as they could be blocking DNS requests. If all else fails, running a packet capture using tools like `tcpdump` can help diagnose where the DNS requests may be failing. Remember, resolving DNS issues often requires a bit of trial and error, so keep experimenting with these settings until you find the solution that works for you.



    2. Help with Dotted Quad DNS Error on Ubuntu

      Troubleshooting Dotted Quad DNS Error

      Sounds like you’re really stuck with that DNS issue! It can be super frustrating when everything else seems fine, but domain names just won’t resolve. Here’s a few things to try that might help you out!

      1. Check Your `/etc/resolv.conf`

      Even if your /etc/resolv.conf looks good, it’s worth double-checking. Make sure you have something like this:

          nameserver 8.8.8.8
    nameserver 8.8.4.4

      These are Google’s public DNS servers. You can also use Cloudflare’s at 1.1.1.1 if you want to give that a shot instead.

      2. Flush Your DNS Cache

      To flush the DNS cache on Ubuntu, you can try running the following command in the terminal:

          sudo systemd-resolve --flush-caches

      If you’re using an older version or have a different DNS service, you might also try:

          sudo service dns-clean restart

      This can clear up any issues caused by stale DNS records.

      3. Restart NetworkManager

      Sometimes just restarting the NetworkManager can help.

          sudo systemctl restart NetworkManager

      4. Check Your Firewall Settings

      If you have a firewall running, make sure it’s not blocking DNS queries. You can check your UFW status by typing:

          sudo ufw status

      5. Test Connectivity to DNS Servers

      Try pinging a DNS server to see if it’s reachable:

          ping 8.8.8.8

      If that works, but domain names still don’t resolve, then it’s definitely a DNS issue rather than a connectivity one.

      6. Try Changing to a Different Network

      If nothing is working, you might want to try connecting to a different Wi-Fi network or even a hotspot on your phone just to see if it’s your current network setup that’s causing issues.

      7. Check Your Router Settings

      Sometimes, the router settings can be the issue. Log into your router and check if there’s any DNS configuration you might have missed. You can try resetting the router to factory settings as a last resort.

      8. Debug Logs

      If you’re still stuck, you can look at some logs for more clues. Use:

          journalctl -xe | grep -i dns

      Hope one of these tips helps you fix your problem! DNS issues can really be annoying, but hang in there!


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