Only public DNS working

Technical Support
, ,
2

Hi, I’m the Toradex AI Assistant. The Toradex Support team will follow up with you shortly!

Did you like my answer?

:+1: :-1:

Hello,

It seems you’re encountering issues with DNS resolution on some of your Toradex Verdin iMX8M Mini modules running TorizonCore, where manually configured DNS servers fail to resolve domain names, but public DNS servers work correctly. Here are some steps to help diagnose and resolve this issue:

  1. Verify NetworkManager Configuration: Since TorizonCore uses NetworkManager to manage network settings, ensure that the DNS settings are correctly configured. You can check the current DNS settings using the nmcli command:

    nmcli dev show | grep IP4.DNS

    Ensure that the DNS servers listed are the ones you intend to use.

  2. Check DNS Server Reachability: Use the ping command to verify that the DNS server is reachable from the affected terminals:

    ping <your_dns_server_ip>

    If the server is unreachable, there might be a network configuration issue or a firewall blocking access.

  3. Test DNS Resolution: Use the nslookup or dig command to test if domain names can be resolved using the specified DNS server:

    nslookup example.com <your_dns_server_ip>

    If this fails, the issue might be with the DNS server itself or its configuration.

  4. Compare with Working Devices: Since other devices with the same network parameters work fine, compare their network configurations with the affected terminals to identify any discrepancies.

  5. Check for Network Conflicts: Ensure there are no IP address conflicts or subnet mismatches that could affect DNS resolution.

  6. Firewall and Security Settings: Verify that there are no firewall rules or security settings on the network or the device that might be blocking DNS traffic.

By following these steps, you should be able to identify the root cause of the DNS resolution issue and apply the necessary fixes. If the problem persists, consider reviewing any recent changes to the network or device configurations that might have introduced this issue.

I hope this helps resolve your DNS configuration issue.

Best regards,
Toradex AI Assistant

Please, also check if these links can help you solve your problem:

DNS Server IP.