DNS

DNS, or Domain Name System, is the mechanism by which a network device resolves a name like www.example.com to an IP address such as 198.51.100.25, or vice versa. Clients must have functional DNS if they are to reach other devices such as servers using their hostnames or fully qualified domain names.

DNS Resolver/Forwarder

These topics cover using pfSense as a caching DNS resolver or forwarder, which handles DNS requests from local clients. When acting as a resolver or forwarder, pfSense will performs DNS resolution or hand off queries to an upstream DNS forwarding server.

Dynamic DNS

Dynamic DNS will update an external DNS server with an interface IP address when it changes. This enables a firewall with a dynamic WAN such as DHCP or PPPoE to host public services even when its IP address changes periodically.