Security threats threaten online networks. The threats are targeting enterprise networks, personal networks or other networks by accessing or altering important data. Secure-less networks give authorization of access to data in a network. Network administrators need strong network security for preventing unauthorized access, misuse or modification, of the network’s accessible resources.

Mostly small or medium-sized enterprises use a firewall, antivirus and anti-spam software for network security, but they are not strong enough for protecting the network. The enterprise network protection is a crucial part of network security because, the enterprise network is the most common target for hackers.

A Virtual Private Network is a reliable way to communicate between different enterprise branches and it keeps the data secure while connecting with internal networks. IPsec VPN is one of the strongest security protocols for providing data encryption and protection. It is the most secure, and reliable Virtual Private Network protocol for connecting two or more remote area networks.

The purpose of this thesis is to introduce Virtual Private Network services and implement the IPsec protocol for securing a small and medium-sized enterprise networks.