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Implementation of the IPv6 protocols stack has become a fact in military networks. Although the IPv6 protocol is very efficient but all problems with its adaptation to military networks have not been resolved yet. The assurance of necessary level of quality of services in changing condition of available bandwidth is an example of such a problem. Additionally, current military networks also use narrowband links, especially in their radio segments. The problem is serious, because the IP protocols suite (and thus IPv6) has been elaborated and developed for wideband networks and for carrying the non real-time traffic. Thus, for instance, the voice or video can be provided using IPv6, but a minimum bandwidth is required or advanced QoS supporting mechanism have to be implemented. The research carried out by the FKIE, the Computer Science Department of the University of Bonn and the Polish MCI/MUT teams are related to developing of IPv6 QoS mechanism that are well suited to the low bandwidth requirements in military networks. These mechanisms have been implemented both in real-life software and in simulation environments. The first experiments show their proper behavior in IPv6-based military networks with limited bandwidth links. The paper covers a description of modeling and simulation of proposed QoS mechanisms. The authors have concentrated on an analysis of the service multiplexing and priority handling procedures. The aim of this effort is to evaluate bandwidth utilization that allows increasing the information flows. Achieved results give a possibility of using simulation models for testing of new developed or modified IPv6 mechanisms for wider tactical networks.