In this chapter, solutions for IP mobility are briefly described. We present security issues related to IP mobility. Indeed, the vulnerabilities associated with Mobile IP networks are identified and a detailed description of the mechanisms for securing data exchange with Mobile IPv6 is provided. More precisely, neighbor discovery, IP address auto-configuration and data protection via IP tunnel mechanisms are presented. Finally, security open issues are summarized at the end of this chapter. Other solutions to improve IP mobility support are presented, such as HIP (Host Identity Protocol) and NetLMM (Network Local Mobility Management)