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pppd is the PPP daemon which is used to manage network connections between two nodes on Unix-like operating systems. It is configured using command line arguments and configuration files.

While it has initially and mainly been used to manage only dial-up access, it is also used to manage broadband connections such as DSL, if Point-to-Point Protocol over Ethernet (PPPoE) or Point-to-Point Protocol over ATM (PPPoATM) is used.

The role of pppd is managing PPP session establishment and session termination.

During session establishment, pppd has the role of:

pppd terminates a PPP link when:

Some newer versions of pppd are also capable of handling Dial-on-demand routing, where pppd sets up a virtual network, captures the packages it receives and establishes a PPP connection and forwards the captured and not-yet transmitted packages over the link.

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