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5.6. Configuring PPP (Point-to-Point) Settings

Authentication Methods
In most cases, the provider’s PPP servers supports all the allowed authentication methods. If a connection fails, the user should disable support for some methods, depending on the PPP server configuration.
Use point-to-point encryption (MPPE)
Microsoft Point-To-Point Encryption protocol (RFC 3078).
Allow BSD data compression
PPP BSD Compression Protocol (RFC 1977).
Allow Deflate data compression
PPP Deflate Protocol (RFC 1979).
Use TCP header compression
Compressing TCP/IP Headers for Low-Speed Serial Links (RFC 1144).
Send PPP echo packets
LCP Echo-Request and Echo-Reply Codes for loopback tests (RFC 1661).


Since the PPP support in NetworkManager is optional, to configure PPP settings, make sure that the NetworkManager-ppp package is already installed.