This paper has presented an overview of the IPv6 protocol. Although it is not yet widely deployed, the number of devices using IPv6 will increase as the markets driving the need for those devices to support IPv6 open up. This new Internet protocol was designed with small, mobile, “always-on” connected devices in mind. IPv6 improves the current Internet by standardizing support for mobility, quality of service, autoconfiguration, and security. Secure network interactions are increasingly important as devices control more critical functions over the network. The public key infrastructure is still a barrier to widespread, automated use of IP security. Ongoing work and discussions in the IETF working groups should solve the key distribution issues for Mobile IP and for low-cost network appliances.