Software-defined networking (SDN) is an emerging technology as a new paradigm for network architecture. It is a revolutionizing technology that facilitates effective management and programmability in a network. With the surge in popularity of SDN, security measures to protect enterprise networks are getting more critical. In SDN, security methods like firewalls must deal with unpredictable network environments. A firewall is an essential part of network security. It can restrict network data traffic flows according to predefined rules. This research paper analyzes the performance of SDNbased firewalls implemented on different network layers. Mininet simulation tool creates a topology using POX controller and open flow switch. Evaluate data flow by implementing and without a firewall using transmission control protocol (TCP) and user datagram protocol (UDP). To evaluate the performance of the proposed firewall, network parameters like bandwidth, roundtrip time, jitter, and packet loss must be analyzed. The outcome proved that the performance has improved whether either firewall was implemented or not. In the future, by using the Mininet simulation tool with other external controllers like RYU, Floodlight, NOX, etc., analyze the parameters mentioned above and make firewall rules for the application layer.