Source-specific routing
Résumé
Source-specific routing (not to be confused with source routing) is
a routing technique where routing decisions depend on both the source
and the destination address of a packet. Source-specific routing solves
some difficult problems related to multihoming, notably in edge
networks, and is therefore a useful addition to the multihoming
toolbox. In this paper, we describe the semantics of source-specific
packet forwarding, and describe the design and implementation of
a source-specific extension to the Babel routing protocol as
well as its implementation — to our knowledge, the first complete
implementation of a source-specific dynamic routing protocol —,
including a disambiguation algorithm that makes our implementation work
over widely available networking APIs. We further discuss
interoperability between ordinary next-hop and source-specific dynamic
routing protocols. Our implementation has seen a moderate amount of
deployment, notably as a testbed for the IETF Homenet working group.
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