Am I loosing my mind with pfSense? DNS Trouble

KingCollins · March 13, 2019

Hey guys, long story short, I have a standard WAN connection on pfsense with multiple VPN gateways. I have configured certain devices to pass through the VPN tunnels, which is working well, except for these blasted DNS queries!!!

First off I have DNS Resolver enabled, DNS DHCP (ISP DNS) override disabled, and Google DNS configured as my default DNS server for the resolver. This doesn't change anything, any device in my home still uses my ISP DNS for resolving queries. That's one issue,

Second issue, I have a Windows 10 machine and a Windows 7 VM, both automatically assigning IP address and DNS, and BOTH passing through a VPN tunnel.

Yet, when I do a DNS leak test, one machine resolves to my ISP, and the other resolves to my VPN DNS . . . . WHY??

There's no difference in configuration, makes no sense, any ideas?

Screenshots:

Windows 10:

Windows 7 VM:

Falconevo · March 13, 2019

If you are using VPN tunnels, generally the DNS is also configured on the tunnel endpoint as forwarding all traffic down a tunnel and not configuring DNS on the exit point will prevent any DNS lookups being made.

DNS in pfSense's system config wont matter if you are shunting *all* traffic including UDP 53 down a VPN tunnel. You can usually specify the endpoint DNS servers in the VPN tunnel configuration.