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TZ 400 is not passing correct DNS servers over LAN DHCP, but is passing correct ones over WiFi DHCP

bkdbkd Newbie ✭
in Entry Level Firewalls

I'm running an Ubuntu utility server with Pi-Hole at 10.0.0.6 for my LAN DNS, backed up with 1.1.1.1 and 8.8.8.8 as backup DNS servers.


At least, that's what I put into the fields under Network -> DNS.


When I look at my wifi network settings, the correct DNS servers are getting passed down over DHCP.

When I look at my wired network settings, it's showing me 10.0.0.5, which is a deprecated windows server, with 8.8.8.8 as a backup.

I've confirmed this with other PCs on the network, and it persists after renewing leases, but I have no idea where those deprecated DNS server settings may be buried.

Category: Entry Level Firewalls
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Best Answer

  • CORRECT ANSWER
    MarkDMarkD Cybersecurity Overlord ✭✭✭
    Answer ✓

    Check your DHCP scopes bound to each interface on the FW

    (Manage/Interfaces/DHCP) the scope can either be Inherited from SonicWALL's DNS settings (Network/Manage/DNS ) or Specified Manually in the scope.

    ie

    image.png


Answers

  • bkdbkd Newbie ✭

    That was it.


    I have no idea why I wouldn't have have initially told it to inherit, but there we are.

  • MarkDMarkD Cybersecurity Overlord ✭✭✭

    Glad its now sorted

  • ArkwrightArkwright Community Legend ✭✭✭✭✭

    If you have failover & LB configured, with different DNS on different WANs, then the inherited DNS can change.

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