This specification provides a new 6LoWPAN dispatch type for use in Route-over and mixed Mesh-under and Route-over topologies, that reuses the encoding of the mesh type defined in RFC 4944 for pure Mesh-under topologies. This specification also defines a method to compress RPL Option (RFC6553) information and Routing Header type 3 (RFC6554), an efficient IP-in-IP technique and opens the way for further routing techniques. This extends 6LoWPAN Transmission of IPv6 Packets (RFC4944), and is applicable to new link-layer types where 6LoWPAN is being defined.