Point-to-Point Protocol daemon (PPPD) is the daemon that implements Point-to-Point Protocol (PPP).
PPP is used to manage network connections between two nodes on Unix-like operating systems.
While it has initially 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 (PPPoA) 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.