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The concept of transition from IPv4/IPv6 network is currently being extensively studied to gain high level compatibility for easy, independent deployment ofIPv6. The transition between IPv4 and IPv6 internet will be a very long process as they are completely incompatible two protocols. IPv6 offers various features including Larger addressing capacity and capabilities, QoS control, encryption and decryption, mobility, routing, security, real time applications like video and audio. Also it is impossible to switch the entire internet over night. As we know IPv4 and IPv6 coexist for a long time, and require the transition and inter-operation mechanism. Due to this reason several transition mechanisms have been implemented which can be used to createIPv6 smooth transition. Due to this fact, several transition mechanisms have been developed and introduced by IETF. This paper discusses comparative and behavior analysis carried out on the two majorIPv6 interoperation mechanisms: BD-SIIT and DSTM for the high level compatibility smooth transition, and interoperation between IPv4 andIPv6. This work not only attempts to determine the outright performance of each transition mechanism against the other but also against a theoretical evaluation of the specification. In this paper proposes a comparative study of the behavior of Comparison, Performance and Evaluation of the differences between BD-SIIT and DSTM transition mechanisms.