Samuel W. Barasa et al, International Journal of Computer Science and Mobile Computing, Vol.7 Issue.7, July- 2018, pg. 32-44 © 2018, IJCSMC All Rights Reserved 32 Available Online at www.ijcsmc.com International Journal of Computer Science and Mobile Computing A Monthly Journal of Computer Science and Information Technology ISSN 2320–088X IMPACT FACTOR: 6.017 IJCSMC, Vol. 7, Issue. 7, July 2018, pg.32 – 44 Map of the Various Configuration Attributes from IPv4 to IPv6 Networks for Dual Stack, 6to4 Tunnelling and NAT: Modelling Designs in OPNET Modeller Samuel W. Barasa 1 , Samuel M. Mbugua 2 , Simon M. Karume 3 ¹Department of Computer Science, Kibabii University, Kenya ²Department of Information Technology, Kibabii University, Kenya ³Department of Computer Science, Laikipia University, Kenya 1 sammuyonga@gmail.com; 2 smbugua@kibabiiuniversity.ac.ke; 3 smkarume@gmail.com Abstract—This paper presents a performance evaluation study of dual stack, 6to4 tunnelling, and Network Address Translation transition schemes on simulative method in IPv4/IPv6 networks. This research aims to find out what IPv4/IPv6 transition scheme performs better in terms of performance parameters packet losses, delays, segment delays, query response times, packet delay variations, packet end-to-end delays, jitters, mean opinion score value, and traffic sent and received for data, voice and video traffic. An equal capacity of network load in terms of probes for the three scenarios is considered and benchmarked to ascertain the impact on the performance parameters on IPv4/IPv6 networks. The scenarios are basically network models configured and simulated using Optimized Network Engineering Tool modeler. The core model designed represents an Internet Service Provider network deployed to form an ideal choice of IP domain corresponded to a realistic network topology running both IPv4 and IPv6 connections. The dual stack, 6to4 tunnelling, and NAT network models are defined which allow the researcher to compare the simulated results. This paper shows that automated 6to4 tunnelling has better performance since it requires only one IPv4 address per tunnel for unlimited number of concurrent sessions though not suitable for voice perhaps because of the encryption overhead. Keywords— IPv4, IPv6, Dual stack, 6to4 tunnelling, NAT, OPNET I. INTRODUCTION The development of IPv6 was to replace and enhance IPv4 power as a key tenet of the current internet platform. Its birth is the preferable alternative to IPv4 since it can support the accelerated growth of the internet enabled applications and devices as well as unlock the security concerns posed by IPv4. Furthermore, the inadequacy and depletion of IPv4 addresses and the growing need for an enhanced next-generation internet protocol that is fundamentally secure, have made IPv6 deployment urgent with a focus on secure, larger address space, and better performance [1].