Network transport protocols like TCP were designed under the assumption that an endpoint is connected to a single network and addressed by only one Network Layer address. But today, with the popularity of resilience-critical applications, like e-commerce, e-health and emergency services, there is interest in having multi-homed endpoints, where systems are connected to multiple networks to provide necessary resilience. The management of multi-homing creates challenges for applications and underlying protocols alike. For the best application performance, the approaches on the different protocol layers should work cooperatively.

While multi-homed Transport Layer protocols like SCTP have been available for quite some time, multi-homing has become a hot research topic because of the recent progress by the IETF to standardize Multi-Path TCP (MPTCP), a multi-homing extension for TCP. This effort has also led to research on the Session Layer (e.g. HIP) and Network Layer (e.g. LISP, ILNP), particularly for routing approaches with respect to resilience. Cross-layer optimisation in this field may lead to further improvements.

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