Draytek 2750 manual Username, Tunnel Mode

Username	Type the name obtained from the broker. “vigor2750” is a
	default username applied from
	http://go6.net/4105/register.asp. It is suggested for you to
	apply another username and password.
Password	Type the password assigned with the user name.
Confirm Password	Type the password again to make the confirmation.
Tunnel Broker	Type the address for the tunnel broker IP, FQDN or an
	optional port number.
Tunnel Mode	IPv6-in-IPv4 Tunnel- Let the broker choose the tunnel
	mode appropriate for the client.
	IPv6-in-IPv4 (Native) - Request an IPv6 in IPv4 tunnel.
	IPv6-in-IPv4 (NAT Traversal - Request an IPv6 in UDP
	of IPv4 tunnel (for clients behind a NAT).

Auto-reconnect Delay	After passing the time set here, the client will retry to
	connect in case of failure or keepalive timeout.
	0 means not retry.
Keepalive	Yes – Keep the connection between TSPC and tunnel
	broker always on. TSPC will send ping packet to make
	sure the connection between both ends is normal.
	No - The client will not send keepalives.
Keepalive_interval	Type the time for the interval between two keepalive
	messages transferring from the client to the broker.
Vigor2750 Series User’s Guide	209