Service Name (Optional): You can add a short description such as "ADSLConnection" or anything else you wish
Primary DNS (Optional): If you leave it empty, it will get it from DHCP. Telefónica primary DNS is 220.127.116.11
Secondary DNS (Optional): Telefónica secondary DNS is 18.104.22.168
Connection: Keepalive. If you want the router to disconnect from the service if no Internet activity happens, select Connect on Demand. If selected, include the idle time the router will wait to disconnect in case there is no traffic.