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PPP Multilink is a bandwidth-on-demand protocol that can connect multiple links between two systems as needed to provide bandwidth on demand. The technique is often called bonding or link aggregation. For example, the two 64-Kbit/sec B channels of ISDN can be combined to form a single 128-Kbit/sec data channel. Another example would be to bind one or more dial-up asynchronous channels with a leased synchronous line to provide more bandwidth at peak hours of the day.

MLPPP is defined in RFC 1990 (PPP Multilink Protocol, August 1996). It is an extension to the PPP (Point-to-Point Protocol). See "PPP (Point-to-Point Protocol)" for information about the basic protocol. Microsoft Windows, Linux, and other operating systems support multilink. Many routers also support Multilink PPP and the ability to connect remote LANs with multiple dial-up or ISDN lines.