ng based on IID. Internet-Draft An individual or working group contribution to the IETF that may become RFC, may change drastically between subsequent versions, and will expire in six months if not renewed. An Internet-Draft can be referenced only as work-in-progress, as they are not stable documents by any means. Internet Control Message Protocol version 6 (ICMPv6) A control protocol used, for example, for neighbor discovery, router discovery, communication of error situations, 'pinging', multicast listener discovery, mobile IPv6, RPL, and multicast router discovery. Internet Engineering Task Force (IETF) The standardization organization responsible of key Internet protocols, such as IP, TCP, UDP, DNS, and HTTP. Internet Protocol version 4 (IPv4) The Internet protocol that made the Internet a huge success and that provides the network layer services for almost all of the Internet as of Glossary xxxvii today. Suffers from only having a 32-bit address space, and is therefore being replaced by IPv6. Internet Protocol version 6 (IPv6) The next generation Internet protocol that provides a 128-bit address space, alongside other improvements. IoT, MTC, M2M Internet of Things (IoT), Machine Type Communications (MTC), and Machine to Machine (M2M) all refer to concept where Internet-enabled nodes - which are not directly operated by humans - talk to other nodes. The IoT is used especially in the context of low-cost, low-power, smart objects. The M2M is usually used in the context where not SO low-power and low-cost machines talk to other machines. The MTC is used especially in 3GPP to refer to M2M type of communications. These Internet-enabled objects can be smart electricity meters, heart rate sensors, vending machines, street lights, and alike. IP mobility Technologies that allow a node to change its point of attachment inside a network (intra-network) or between networks (inter-network) without any change in address and without disconnection of transport layer sessions. The key protocols are host-based mobile IP and ne