Installing and Administering PPP

24 Chapter 2

Setting Up PPP Connections

Conﬁguration Overview

A pppd process on a local system negotiates with the pppd process on a

remote or peer system to establish the PPP connection. The following

ﬁles are used for PPP connections:

• /etc/ppp/Autostart starts pppd for on-demand outbound calls.

• /etc/ppp/Systems contains the hostname or IP address of peers

and how to connect with peers.

• /etc/ppp/Devices associates dialer types with physical devices

and speeds. pppd examines the ﬁle when it places a call. If no suitable

speed is found or if all devices associated with that speed are busy,

pppd tries again later.

• /etc/ppp/Dialers describes how to dial each type of modem

attached to the HP-UX system that is to be made available for

outbound calls.

• /etc/passwd is used to verify the login of an inbound connection.

• /etc/ppp/Login is a shell script that is run after a successful login.

the peer to negotiate and establish a PPP connection.

The following section describes how these ﬁles are used to create a PPP

connection.

How PPP Connections are Established

In the following example, the local system “robin” attempts to connect to

the peer system “lark” via PPP, as shown in Figure 2-1.

Figure 2-1 PPP Connection Example

robin

lark

PPP Connection

(outbound)

(inbound)