> Specifies the domain name passed to the client to form its fully qualified hostname. If the Domain Name is left blank, then the domain name of the firewall it sent to the client.
The client will automatically try adding the domain when looking up hostnames. Normally on Linux the FQDN is not specified in /etc/hostname but only in /etc/hosts.
Then it will automatically register them in DNS with that name: https://docs.netgate.com/pfsense/en/latest/services/dns/reso...
> The domain name from System > General Setup is used as the domain name on the hosts.
Then in the DHCP configuration, you set the domain name as well (defaults to using the general setting): https://docs.netgate.com/pfsense/en/latest/services/dhcp/ipv...
> Specifies the domain name passed to the client to form its fully qualified hostname. If the Domain Name is left blank, then the domain name of the firewall it sent to the client.
The client will automatically try adding the domain when looking up hostnames. Normally on Linux the FQDN is not specified in /etc/hostname but only in /etc/hosts.