The Mobile ad hoc networks (MANET) have become most significant and are being used widely in many applications. Generally, these applications require low cost, low energy and low data nodes that communicating over multiple hop to cover a large geographical area. In internet protocol version (IPv6) based MANETs, the neighbor discovery enables nodes to self-configure and communicate with neighbor nodes through auto configuration so the chances of energy consumption and security of network become high. This paper presents a survey of different routing protocols of IPv6 based MANET to minimize the cost, delay, energy consumption rate. The major dispute in providing connectivity is to minimize the energy consumption of network and provide security in ad hoc routing protocol between nodes and ad hoc networks. There, this paper focuses on comparative analysis of routing protocols with their security and also we briefly describe different ways to provide global security for IPv6 based MANETs.