IJSRSET1849103 | Received : 10 August 2018 | Accepted : 28 August 2018 | July-August-2018 [ 4 (9) : 575-580] © 2018 IJSRSET | Volume 4 | Issue 9 | Print ISSN: 2395-1990 | Online ISSN : 2394-4099 Themed Section : Engineering and Technology 575 Design and Implementation of Secure Communication Between Two Branches of a Company Using IPSEC Based VPN(Virtual Private Network) Protocol V. Sushma, T. Venkateswarlu ECE Department, S.V.U College of Engineering, Tirupati, Andhra Pradesh, India ABSTRACT Now a day's most of the corporate business network infrastructure needs to securely transfer data across the Internet. Data can be a company‟s top-secret information regarding product designs, product release dates, patent information, HR employee investigations, etc. This project provides insight for a secure solution to this business need using Virtual Private Network (VPN).There are a number of VPN protocols in use that secure the transport of data traffic over a public network infrastructure. IPSec is a protocol suite for securing internet protocol communications via authenticating and encrypting every IP packet of a conversation session. A tunnel is created to secure VPN communication through WAN between two participants. A tunnel can provide Privacy, Content reliability and authentication and Sender authentication and if using certificates no repudiation (via data origin authentication). Juniper SRX Security devices supports the IPSec VPN tunnel formation not only using Policies, it can also be done by routing a traffic to a virtual interface called st0 interface which reduces the burden of policy verification. The aim is to configure a separate secure tunnel logical unit. With route-based VPNs, organizations define the VPN overlay links and then define the static routes that will be used for transport, allowing the route, to determine which traffic goes through the VPN. Keywords : VPN, IPSec, Routing, OSPF, Authentication, Encryption, Encapsulation I. INTRODUCTION IPSEC (Internet Protocol Security) is a network layer security protocol that is designed to support secure TCP/IP environment over the Internet considering flexibility, scalability, and interoperability. Unlike the other security protocols it provides security among the hosts. Recently, IPSEC is emphasized as one of the important security infrastructures in the NGI (Next Generation Internet). It also has suitable features to implement VPN (Virtual Private Network) efficiently and its application areas are expected to grow rapidly. In this paper, the basic concepts and related standard documents of IPSEC. The IPSEC is an open architecture and an open frame work defined by the IPSEC working group of the IETF. It provides a scalable, long lasting base for providing network layer security. The IPv4 implementations are strongly recommended to support IPSEC and IPv6 implementations are required to do so. IPSec gives the base protection capabilities for the net and furnishes bendy constructing blocks from which comfy and prospering virtual non-public networks (VPNs) may be built. IPSec Security Features: It was designed to provide high security while transferring packets across the networks and it is the most commercial for connecting network sites.