Multicasting refers to the simultaneous delivery of information to a large number of destinations. Multicasting is the first choice of several communication applications because it requires less bandwidth and delays than a multiple unicasting. To that end, many multicast transport protocols have been designed. However, not all of them have been able to satisfy different applications' requirement and they must have their own features to meet these requirements. Among the features that the multicast protocol need to have are reliability, congestion and flow control, ordering, error recovery, and group management.