The Setup or main tab of a router’s administrative interface is typically when the most basic configuration elements appear. For example, if your ISP has allocated you a static IP address it would be entered here. In cases where your provider uses an authentication scheme like PPPoE (with DSL), it if from this tab that you would select that option and then enter your username and password.
If your ISP disconnects PPPoE sessions after a period of inactivity, set the Keepalive value to an appropriate value. If you want your connection closed when inactive (for security purposes), use the Connect on demand option and specify a period of inactivity, after which the session will be terminated automatically.