Installing and Administering PPP

58 Chapter 3

SLIP to PPP Migration

Setting up Inbound PPP Connections

On machines that only accept incoming calls, pppd does not need to be

started at boot time, since pppd is started when a PPP login occurs.

Machines that both initiate and receive calls must start pppd at boot

time, and must also prepare accounts for incoming connections. User

accounts must be created in the /etc/passwd ﬁle for the system to be

able to accept incoming calls. An example entry in /etc/passwd would

be:

pppuser::3008:2002:PPP users login (for testing):/etc/ppp:/etc/ppp/Login

The ’3008’ in the passwd entry is a unique uid for this PPP login, and the

’2002’ is the uid corresponding to the ’ppp’ group in /etc/group.

The Login shell script, shown in the /etc/passwd example as

/etc/ppp/Login, starts pppd on the local system to communicate with

pppd on the peer. The two pppd’s negotiate and establish the PPP

connection. See Chapter 2 for more information.