User manual MAXTOR PPP5

[. . . ] PPP is the standard protocol for remote access connectivity and serial point-to-point links. PPP is used to send data packets over a serial line, such as a modem using an analog telephone line. The main components of PPP are the encapsulation scheme (how it forms a data packet), the authentication mechanism, the Link Control Protocol (LCP) and the Network Control Protocol (NCP). Encapsulation PPP uses a variant of the High Speed Data Link Control (HDLC) protocol to frame the data from the network layer. [. . . ] A separate RFC details each network layer protocol's specific needs. For example, the Matrox iSwitch is TCP/IP based and requires negotiation of options such as IP address and Van Jacobson compression. Those most applicable to the Matrox iSwitch are: · · · · · · 1661 - The Point-to-Point Protocol. For a detailed explanation of how PPP and its related protocols work, please refer to the RFCs listed above. The Matrox iSwitch uses PPP to establish a connection to the Internet via an ISP. · Initially there is no physical link between the Matrox iSwitch and the ISP. When the LAN accesses the Internet, the Matrox iSwitch automatically dials the ISP. The Matrox iSwitch PPP process moves from the closed state to the LCP negotiation phase. In the LCP negotiation phase both the Matrox iSwitch and the ISP suggest certain configuration parameters which the other side may accept or reject. Typical parameters would be ACCM, compression types, packet sizes and authentication. If the Matrox iSwitch negotiates the parameters successfully with the ISP and establishes a successful link, PPP moves to the authentication phase. If the authentication fails the link will terminate and PPP will return to the closed state. Otherwise, PPP transitions to the ready phase and the Matrox iSwitch negotiates IPCP options with the ISP. During the IPCP phase, the ISP assigns the Matrox iSwitch an IP address to use on the Internet. [. . . ] On the other hand, the Matrox iSwitch does not support MPPP across different modems. To load balance among the various serial ports Matrox Aggregate Link Technology (MALT) will be used. Common problems in establishing PPP connections are often due to an authentication failure or an authentication protocol mismatch. [. . . ]