Techno-Evaluation and Empirical Study of Virtual Private Networks Using Simulation Rahul Malhotra and Rajneesh Narula Abstract —A virtual-private network is a computer network is a computer network that uses public telecommunication infrastructure such as internet to provide secure internet access to remote offices or individual users. The aim of using virtual private networks is to avoid an expensive system of owned or leased lines. It encapsulates encrypted data transfer between two or more networked devices which are on same private network using ISDN/PSTN. Routing is the main technical issue performed by tunneling protocols. Virtual Private Networks are configured at routers and permit safe communication through an unsafe environment. Virtual Private Network creates a tunnel, a logical group of routers to provide a safe path to data to reach the destination. A tunnel provides private traffic to be sent through public path. IT Guru Network Planner OPNET accelerates Virtual Private Network deployments and ensures optimal performance of Virtual Private Network based applications. Index Terms— virtual private networks, simulation, traffic forwarded, traffic received, network delay. —————————— —————————— 1 INTRODUCTION computer network is a collection of computers and devices interconnected by communications a chan- nel that softens the advancement of communications among users and allow users to share resources. Net- works may be classified according to a wide variety of characteristics. A computer network allows sharing of resources and information among unified devices. Com- puter networks can be used for a variety of purposes like Providing Communications- Using a network, people can communicate efficiently and easily via email, instant mes- saging, chat rooms, telephone, video telephone calls, and video conferencing. Allocation Hardware- In a networked environment, each computer on a network may access and use hardware resources on the network, such as printing a document on a shared network printer. Allo- cating files, data, and information. In a network environ- ment, authorized user may access data and information stored on other computers on the network. The capability of providing access to data and information on shared storage devices is an important feature of many networks. Sharing software. Users connected to a network may run application program on remote computers. 2 VIRTUAL PRIVATE NETWORKS Today's corporations are challenged by the need to support a wide variety of communications across a highly distributed number of sites and offices. At the same time that the number of sites and offices increases, corporations are pressured to reduce the cost of their overall communi- cations expenses. In addition to the increased number of office locations, employees expect to access corporate re- sources from a more diverse set of locations, including customer sites, home offices, and travel destinations. As more emphasis is placed on electronic communication, business partners also expect to access corporate- partner data as well. All of these trends drive the need to establish a corporate private-network infrastructure. With regard to communications expenses, however, corporations are finding that traditional architecture does not provide the flexibility and solutions required. Using dedicated leased-line circuits to interconnect main offices and branch offices often requires significant planning time, and once in place the circuits cannot support remote or customer sites. The increase in telecommuting and re- mote computing is, in turn, increasing resources spent on remote-access modems, servers, and long-distance tele- phone charges. Private networks that utilize the Internet backbone can significantly reduce the costs of establishing and maintaining a WAN for private-networking purposes. Private networks that utilize the Internet backbone can significantly reduce the costs of establishing and maintain- ing a WAN for private-networking purposes. Internet ser- vice provider (ISP)–based private networks offer a global footprint with ubiquitous local network access. Using an ISP–based private network, corporations can connect their offices to the ISP's local points of presence (PoPs) rather than purchase costly leased-line circuits to interconnect their office locations. The corporation takes advantage of the ISP's established backbone, which is usually more geographically diverse than its WAN architecture. The ISP can also offer local dial-up access at a diverse number of locations, which helps reduce long-distance remote-access costs. ———————————————— • Rahul Malhotra is with the Department of Electronics and Communication Engineering, Bhai Maha Singh College of Engineering, Muktsar, Punjab, India. • Rajneesh Narula is with the Department of Computer Science and Engi- neering, Bhai Maha Singh College of Engineering, Muktsar, Punjab, India. A © 2011 Journal of Computing Press, NY, USA, ISSN 2151-9617 http://sites.google.com/site/journalofcomputing/ JOURNAL OF COMPUTING, VOLUME 3, ISSUE 7, JULY 2011, ISSN 2151-9617 HTTPS://SITES.GOOGLE.COM/SITE/JOURNALOFCOMPUTI NG/ WWW.JOURNALOFCOMPUTING.ORG 141
