Unblocking Private IPs from Public DNS under PFSense
Keep in mind that this is a security function you are disabling. This feature helps mitigate DNS Rebinding Attacks, so you should read more to understand the implications of such. You can also allow private IP resolution on a domain-by-domain basis per the PFSense docs. Personally, I prefer to use OpenDNS resolvers as they have better protection over DNS Rebinding and just about every other type of attack out there.