D-Link DFL-2500 User Guide - Page 81
PPPoE Client Configuration
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62 Chapter 9. Interfaces IP addresses provisioning can be per user groups. 9.4.1 PPP Point-to-Point Protocol (PPP), is a protocol for communication between two computers using a serial interface, for instance, a dialup connection where a personal computer is connected by telephone line to a server. The ISP provides the user with a PPP connection so that the provider's server can respond to the user's requests, pass them on to the Internet, and forward requested Internet responses back to the user. Relative to the OSI reference model, PPP provides Layer 2 (data-link layer) service. At Layer 2, PPP defines an encapsulation mechanism to support multi-protocol packets to travel through IP networks. It starts with a Link Control Protocol (LCP) for link establishment, configuration and testing. Once the LCP is initialized, one or several Network Control Protocols (NCPs) can be used to transport traffic for a particular protocol suite, so that multiple protocols can interoperate on the same link, for example, both IP and IPX traffic can share a PPP link. Authentication is available as an option for PPP communications. The authentication protocols that PPP currently supports include: • Password Authentication Protocol (PAP) • Challenge Handshake Authentication Protocol (CHAP) • Microsoft CHAP version 1 • Microsoft CHAP version 2 If authentication is used, at least one of the peers has to authenticate itself before the network layer protocol parameters can be negotiated using NCP. During the LCP and NCP negotiation, optional parameters such as encryption, can be negotiated. When LCP and NCP negotiation is done, IP datagrams can be sent over the link. More about the application and security of PPP can be found in section 22.2 PPTP/L2TP. 9.4.2 PPPoE Client Configuration D-Link firewalls allow users a secure and easy-to-manage connection to the ISP. D-Link Firewalls User's Guide
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