D-Link DFL-860-IPS-12 Product Manual - Page 102
Note: PPPoE has a discovery protocol, IP address information, User authentication, Dial-on-demand
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3.3.4. PPPoE Chapter 3. Fundamentals source interface. For outbound traffic, the PPPoE tunnel interface will be the destination interface. As with any interface, one or more routes are defined so NetDefendOS knows what IP addresses it should accept traffic from and which to send traffic to through the PPPoE tunnel. The PPPoE client can be configured to use a service name to distinguish between different servers on the same Ethernet network. IP address information PPPoE uses automatic IP address allocation which is similar to DHCP. When NetDefendOS receives this IP address information from the ISP, it stores it in a network object and uses it as the IP address of the interface. User authentication If user authentication is required by the ISP, the username and password can be setup in NetDefendOS for automatic sending to the PPPoE server. Dial-on-demand If dial-on-demand is enabled, the PPPoE connection will only be up when there is traffic on the PPPoE interface. It is possible to configure how the firewall should sense activity on the interface, either on outgoing traffic, incoming traffic or both. Also configurable is the time to wait with no activity before the tunnel is disconnected. Unnumbered PPPoE When NetDefendOS acts as a PPPoE client, support for unnumbered PPPoE is provided by default. The additional option also exists to force unnumbered PPPoE to be used in PPPoE sessions. Unnumbered PPPoE is typically used when ISPs want to allocate one or more preassigned IP addresses to users. These IP addresses are then manually entered into client computers. The ISP does not assign an IP address to the PPPoE client at the time it connects. A further option with the unnumbered PPPoE feature in NetDefendOS is to allow the specification of a single IP address which is used as the address of the PPPoE client interface. This address can serve the following purposes: • The IP address specified will be sent to the PPPoE server as the "preferred IP". If unnumbered PPPoE is not forced, the server may choose to not accept the preferred IP and instead assign another IP address to the PPPoE client. When the option to force unnumbered PPPoE is selected, the client (that is to say NetDefendOS) will not accept assignment of another IP address by the server. • The IP address specified, or possibly the address assigned by the PPPoE server when unnumbered PPPoE is not forced, will serve as the IP address of the PPPoE client interface. This will be used as the local IP address for traffic leaving the interface when the traffic is originated or NATed by the NetDefend Firewall. Note: PPPoE has a discovery protocol To provide a point-to-point connection over Ethernet, each PPP session must learn the Ethernet address of the remote peer, as well as establish a unique session identifier. PPPoE includes a discovery protocol that provides this. 102