With RPL -- the proposed ''IPv6 Routing Protocol for Low-power Lossy Networks'' -- emerging as a Proposed Standard ''Request For Comment'' (RFC) in the Internet Engineering Task Force (IETF) after a ~2-year development cycle, this rticleformat presents a critical evaluation of the resulting protocol and its applicability and limits. The rticleformat presents a selection of observations of the protocol characteristics, exposes experiences acquired when producing a prototype implementation of RPL, and presents results obtained from testing this protocol -- both in a network simulator, and in real-world experiments on a wireless sensor network testbed. The memorandum aims at providing a better understanding of possible weaknesses and limits of RPL, notably the possible directions that further protocol developments should explore, in order to address these.
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