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How to resolve external hosts when using pfSense as firewall/router

pfSense 2.2.5 does not automatically resolve external hosts (but not hosts from the internet) using DNS servers provided by DHCP from the WAN interface. To force it resolve, do: Navigate via Web UI: Services | DNS Resolver Scroll down to Domain Overrides Add entry Domain: [a domain suffix, e.g., test.org] IP address: [DNS server IP] What are the side effects without the above changes? pfSense clients not able to access internet, especially when internet is controlled via a proxy. Windows clients unable to access Windows share even using FQDN