# 30.1.概述

FreeBSD 支持点对点（PPP）协议，可用于通过拨号调制解调器建立网络或互联网连接。本章将介绍如何在 FreeBSD 中配置基于调制解调器的通信服务。

阅读本章后，你将了解：

* 如何配置、使用和排查 PPP 连接；
* 如何设置以太网上的 PPP（PPPoE）；
* 如何设置异步传输模式上的 PPP（PPPoA）。

在阅读本章之前，你应当：

* 熟悉基本的网络术语；
* 理解拨号连接和 PPP 的基础知识及其用途。


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