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OPNET
Technologies OPNET
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We are using OPNET for: 1- Comparing IPv6 end-to-end QoS capabilities with QoS techniques using RSVP and MPLS IPv6 is designed as the next generation Internet Protocol to replace the currently IPv4 protocol. The key enhancements in IPv6 is addressing, in which 128 bits are used instead of 32 bits used now, Quality of Service (QoS) and Security. In our research, we focus on IPv6 QoS capabilities since conventional Internet networks try their best to pass traffic and make no differentiation between types of traffic. As known, real time traffic uses UDP (User Datagram Protocol) which does not resend lost packets because real time packets are time sensitive. Recently, new protocols, to insure that these data packets have less delay and enough bandwidth (guarantees QoS), are introduced, however, more complications, such as cost and processing time, are added to the Internet networks. The two well known QoS protocols are RSVP ( Resource ReSerVation Protocol) and MPLS (Multi Protocol Label Switching). RSVP is used to reserve end to end QoS (Integrated Service Model) in which dedicated path is set and QoS parameters requested by the source are insured along this path and all the nodes along this path. MPLS uses labels to encapsulate IP packets and send them through a backbone network, such as ATM and Frame Relay networks, that can handle QoS issue. In our research, we will use OPNET to test IPv6 capabilities of handling QoS and use the new fields, Flow label and class of service fields that are added to the IP packet format. Packets belong to the same traffic and have been generated from the same source and hiding to the same destination should have the same label, therefore routers will have to check this field only and direct the traffic. This will reduce the processing time and ensures that the same processing procedures are the same for these packets since they have the same label will use the same path. Class of service will be used to specify if traffic is sensitive to time and congestion which allows packets with high settings processed first. The performance of this method in terms of delay, loss rate and clarity (if it is voice) will be compared with methods involve MPLS and RSVP.
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