# Synchronous PPP and Cisco HDLC Programming Guide

## Introduction

The syncppp drivers in Linux provide a fairly complete implementation of Cisco HDLC and a minimal implementation of PPP. The longer term goal is to switch the PPP layer to the generic PPP interface that is new in Linux 2.3.x. The API should remain unchanged when this is done, but support will then be available for IPX, compression and other PPP features

## Known Bugs And Assumptions

PPP is minimal

- The current PPP implementation is very basic, although sufficient for most wan usages.

Cisco HDLC Quirks

- Currently we do not end all packets with the correct Cisco multicast or unicast flags. Nothing appears to mind too much but this should be corrected.

## Public Functions Provided

!Edrivers/net/wan/syncppp.c