Google DNS and DHCP clients

  • I want to move away from using my ISP's DNS servers and use Google's instead.  So I've set the following configuration:

    General Setup:

    • DNS IPs have been set to and

    • "Allow DNS server list to be overridden by DHCP/PPP on WAN" is unchecked

    • "Do not use the DNS Forwarder as a DNS server for the firewall" is checked

    DNS Forwarder:

    • DNS Forwarder is Enabled

    • "Register DHCP leases in DNS forwarder" is checked

    • "Register DHCP static mappings in DNS forwarder" is checked

    • All other options within DNS Forwarder are unchecked

    DHCP Server:

    • DHCP Server is Enabled

    • The DNS Servers section is not populated.

    So on my DHCP clients, when I check the settings the only DNS server configured is the LAN address of my pfSense box.  If I try to do a traceroute from my system on the LAN (with a DHCP lease), I get the following:

    host:~ user$ traceroute
    traceroute to (, 64 hops max, 52 byte packets
     1  pfsense (  1.582 ms  0.750 ms  0.700 ms
     2 (  8.151 ms  8.342 ms  8.116 ms
     3 (  8.336 ms  7.643 ms  8.072 ms

    A couple of questions:

    • Is seeing this IP address normal?  Is this just an internal IP address pfSense is using?

    • Why is my ISP's DNS IP coming up on ping#3 instead of one of the configured Google DNS IPs?

  • DNS simply translates a hostname to a IP address. Using a different DNS server does not mean the route to a certain IP address will be different.

    Answer to 1: probably an internal IP used by your ISP.
    Answer to 2: see above.

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