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Over the last years, we have witnessed a rapid deployment of real-timeapplications on the Internet as well as many research works about Quality ofService (QoS), in particular IPv4 (Internet Protocol version 4). The inevitableexhaustion of the remaining IPv4 address pool has become progressively evident.As the evolution of Internet Protocol (IP) continues, the deployment of IPv6QoS is underway. Today, there is limited experience in the deployment of QoSfor IPv6 traffic in MPLS backbone networks in conjunction with DiffServ(Differentiated Services) support. DiffServ itself does not have the ability tocontrol the traffic which has been taken for end-to-end path while a number oflinks of the path are congested. In contrast, MPLS Traffic Engineering (TE) isaccomplished to control the traffic and can set up end-to-end routing pathbefore data has been forwarded. From the evolution of IPv4 QoS solutions, weknow that the integration of DiffServ and MPLS TE satisfies the guaranteed QoSrequirement for real-time applications. This paper presents a QoS performancestudy of real-time applications such as voice and video conferencing in termsof Packet Delay Variation (PDV) over DiffServ with or without MPLS TE inIPv4/IPv6 networks using Optimized Network Engineering Tool (OPNET). We alsostudy the interaction of Expedited Forwarding (EF), Assured Forwarding (AF)traffic aggregation, link congestion, as well as the effect of performancemetric such as PDV. The effectiveness of DiffServ and MPLS TE integration inIPv4/IPv6 network is illustrated and analyzed. This paper shows that IPv6experiences more PDV than their IPv4 counterparts.

Effect of Packet Delay Variation on Video-Voice over DiffServ-MPLS in IPv4-IPv6 Networks