Implementation of Virtual Firewall Function in SDN (Software Defined Networks)

With the overhauls and increase in network size, it becomes harder to practice maintainability along with security. In recent years, software-defined networking (SDN) has evolved to replace the traditional design of the current network, and with such evolution, raises issues in the firewall. Firewalls are one of the most important components used in networks, and new challenges have been driven by the software-defined networks in implementing firewalls. The main issue of the firewall is its speed. The speed of the firewall is a hindrance; often firewall's link speeds are slower than the supported network interface and can cause the traffic burst from the host to be buffered until packets are processed. To overcome these issues, the aim of our project is to solve by implementing duplicate instances of the firewall. By designing two topologies, a single and multiple controllers, and implementing them in a simulated environment the resulting studies show that multiple controllers in a network environment tend to show an improved performance in the network than in a single controller network.