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Point-to-Point Protocol (PPP) Support

doc/connectivity/networking/api/ppp.rst

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.. _ppp:

Point-to-Point Protocol (PPP) Support #####################################

.. contents:: :local: :depth: 2

Overview

Point-to-Point Protocol <https://en.wikipedia.org/wiki/Point-to-Point_Protocol>_ (PPP) is a data link layer (layer 2) communications protocol used to establish a direct connection between two nodes. PPP is used over many types of serial links since IP packets cannot be transmitted over a modem line on their own, without some data link protocol.

In Zephyr, each individual PPP link is modelled as a network interface. This is similar to how Linux implements PPP.

PPP support must be enabled at compile time by setting option :kconfig:option:CONFIG_NET_L2_PPP. The PPP implementation supports only these protocols:

  • LCP (Link Control Protocol, :rfc:1661)
  • HDLC (High-level data link control, :rfc:1662)
  • IPCP (IP Control Protocol, :rfc:1332)
  • IPV6CP (IPv6 Control Protocol, :rfc:5072)

For using PPP with a cellular modem, see :zephyr:code-sample:cellular-modem sample for additional information.

Testing

See the net-tools README_ file for more details on how to test the Zephyr PPP against pppd running in Linux.

.. _net-tools README: https://github.com/zephyrproject-rtos/net-tools/blob/master/README.md#ppp-connectivity