NTPD

The NTP service is a Network Time Protocol (NTP) daemon which will listen for requests from clients and allow them to synchronize their clock with that of the pfSense firewall. By running a local NTP server and using it for local clients, it reduces the load on the lower-stratum servers and can ensure that local systems can always reach a time server. Before delegating this task to a firewall running pfSense, the best practice is to ensure that the firewall has an accurate clock and keeps time reasonably.

NTP and IPv6

The NTP Project daemon fully supports IPv6 as a client and a server.