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Most of the Virtual Private Network (VPN) suffers from security related and overhead problems. During the inter domain routing, the conventional protocols require each gateway to resend its routing table periodically to all its neighbors thus increasing the delay. Since VPNs carry sensitive information over an insecure network, the traffic in this network has to be transmitted reliably and securely. In this paper, we propose a topology aware reliable routing protocol for inter-domain routing in VPN which securely transfers the data. By simulation results, we show that our proposed protocol is better than the traditional routing protocols of VPN.

A network which merges the usage of the public and the private networks and uses security software for the purpose of compressing, encrypting and masking the digital packets that are being transmitted in the network is called as Virtual Private Network (VPN). In VPN, the communication between the user ends is maintained such that it appears as if the source end is directly linked to the destination end over a concealed leased line. The private network, VPN uses the public network such as internet to link the remote locations with the users. In this study, we propose a new reliable protocol called as Topology Aware Reliable Routing Protocol (TARRP) for large scale VPN and compare its performance with the traditional protocol, Boarder Gateway Protocol (BGP). In this protocol, the communication between the end to end nodes takes place in two phases: Routing phase and authentication phase. In the routing phase, the upstream and the downstream routing paths are determined by the source node using the topology learning protocol. Based on the dynamic failure information of links, the sender selects the failure-free path towards the destination. In the authentication phase, the VPN gateway authenticates the packet before it is transmitted through the core. Thus, this technique efficiently allows the packet to be transmitted with ensured security. By simulation results, we show that our proposed protocol is better than the traditional routing protocol of VPN.

A Mobile Ad-Hoc Network is a collection of mobile nodes that are dynamically and arbitrarily located in such a manner that the interconnections between nodes are capable of changing on continual basis. Due to security vulnerabilities of the routing protocols, wireless ad-hoc networks are unprotected to attacks of the malicious nodes. Virtual Infrastructure achieves reliable transmission in Mobile Ad Hoc Network. Black Hole Attack is the major problem to affect the Virtual Infrastructure. A black hole attack is a severe attack that can be easily employed against routing in mobile ad hoc networks. A black hole is a malicious node that falsely replies for any route requests without having active route to specified destination and drops all the receiving packets. In this paper, we give an algorithmic approach to focus on analyzing and improving the security of AODV, which is one of the popular routing protocols for MANET. Our aim is on ensuring the security against Black hole attack. The proposed solution is capable of detecting Black hole node(s) in the MANET at the beginning and a solution to discover a safe route detects cooperative black hole attack.