Tutorial: Multipath support in IP networks

Networked devices are often equipped with multiple interfaces. Legacy routing and transport protocols only support the transport of data over a single interface resp. paths. This tutorial discusses extensions for IP and TCP in order to support multiple interfaces. Multihoming and mobility management allow the simultaneous usage of interfaces by independent application data flows, while multipath transport also supports the transfer of a single flow over multiple interfaces by splitting the flow at the sender and reassembling it at the receiver. In order to perform this task, extensions of the protocol stack and signalling are required which are discussed in recent drafts at the IETF.