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

I'm running an Ubuntu utility server with Pi-Hole at for my LAN DNS, backed up with and 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, which is a deprecated windows server, with 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

Best Answer

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    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.



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    bkdbkd Newbie ✭

    That was it.

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

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    MarkDMarkD Cybersecurity Overlord ✭✭✭

    Glad its now sorted

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    ArkwrightArkwright All-Knowing Sage ✭✭✭✭

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

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