#A ppp frame includes fcs install
#A ppp frame includes fcs serial
#A ppp frame includes fcs software

*/ #ifndef _PPP_DEFS_H_ #define _PPP_DEFS_H_ /* Don't change the format of that line otherwise, so the

#A ppp frame includes fcs install

* can do the right thing when deciding whether to install a new ppp_defs.h * if everyone increases the FILEVERSION number above, then scripts * ppp_defs.h is shipped with a PPP distribution as well as with the kernel * If you modify this file at all, please set the above date. * OBLIGATION TO PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS,

* ON AN 'AS IS' BASIS, AND THE AUSTRALIAN NATIONAL UNIVERSITY HAS NO * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY * THE AUSTRALIAN NATIONAL UNIVERSITY SPECIFICALLY DISCLAIMS ANY WARRANTIES, * THE AUSTRALIAN NATIONAL UNIVERSITY HAVE BEEN ADVISED OF THE POSSIBILITY

#A ppp frame includes fcs software

* ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN IF

* PARTY FOR DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES * IN NO EVENT SHALL THE AUSTRALIAN NATIONAL UNIVERSITY BE LIABLE TO ANY * makes no representations about the suitability of this software for * documentation is hereby granted, provided that the above copyright * Permission to use, copy, modify, and distribute this software and its The flag field consists of the binary sequence 01111110.* Copyright (c) 1994 The Australian National University. Flag - A single byte that indicates the end of a frame. By prior agreement, consenting PPP implementations can use a 32-bit (4-byte) FCS for improved error detection. Frame check sequence (FCS) - Normally 16 bits (2 bytes). By prior agreement, consenting PPP implementations can use other values for the maximum information field length. The default maximum length of the information field is 1,500 bytes. The end of the information field is found by locating the closing flag sequence and allowing 2 bytes for the FCS field. Data - Zero or more bytes that contain the datagram for the protocol specified in the protocol field. The most up-to-date values of the protocol field are specified in the most recent Assigned Numbers Request For Comments (RFC). Protocol - Two bytes that identify the protocol encapsulated in the information field of the frame. A connectionless link service similar to that of Logical Link Control (LLC) Type 1 is provided. Control - A single byte that contains the binary sequence 00000011, which calls for transmission of user data in an unsequenced frame. PPP does not assign individual station addresses. Address - A single byte that contains the binary sequence 11111111, the standard broadcast address. The flag field consists of the binary sequence 01111110. Flag - A single byte that indicates the beginning or end of a frame.

The following descriptions summarize the PPP frame fields illustrated in Figure 3.6 The PPP frame format appears in the Figure Shown below: A family of NCPs for establishing and configuring different network layer protocols An extensible LCP to establish, configure, and test the connection

#A ppp frame includes fcs serial

A method for encapsulating datagrams over serial links PPP provides a method for transmitting datagrams over serial point-to-point links, which include the following three components:

PPP supports these functions by providing an extensible Link Control Protocol (LCP) and a family of Network Control Protocols (NCPs) to negotiate optional configuration parameters and facilities.

PPP also established a standard for the assignment and management of IP addresses, asynchronous (start/stop) and bit-oriented synchronous encapsulation, network protocol multiplexing, link configuration, link quality testing, error detection, and option negotiation for such capabilities as network layer address negotiation and data-compression negotiation.

The Point-to-Point Protocol (PPP) originally emerged as an encapsulation protocol for transporting IP traffic over point-to-point links.