RFC 2136 client
Enable	>
Interface to monitor	$ifdesc):?> >
Hostname
TTL	seconds
Key name	This must match the setting on the DNS server.
Key type	> Zone   > Host   > User
Key	Paste an HMAC-MD5 key here.
Server
Protocol	> Use TCP instead of UDP
Description
	Note: You must configure a DNS server in System: General setup or allow the DNS server list to be overridden by DHCP/PPP on WAN for dynamic DNS updates to work.