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In networking, the Point-to-Point Protocol, or PPP, is a data link protocol commonly used to establish a direct connection between two nodes over serial cable, phone line, trunk line, cellular telephone, specialized radio links, or fiber optic links. (read more on Wikipedia). If you access the Internet through a modem connected to a dial-up phone line (including mobile modems), then the connection is negotiated using PPP. Some VPNs also use PPP.

A PPP interface is managed by the PPP daemon (pppd) provided by the ppp package. Thus, for the user, configuring a PPP interface means configuring pppd.

See also