This document specifies sockets API extensions for the multihoming
shim layer. The API aims to enable interactions between applications
and the multihoming shim layer for advanced locator management, and
access to information about failure detection and path exploration.
This document is based on an assumption that a multihomed host is
equipped with a conceptual sub-layer (hereafter "shim") inside the IP
layer that maintains mappings between identifiers and locators.
Examples of the shim are SHIM6 and HIP.
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