Packet Filtering Gateway and Application Layer Gateway on Mikrotik Router Based Firewalls for Server and Internet Access Restrictions

Network security is very important in the current era of computer technology development. Attacks on computer systems connected to the Internet which are very vulnerable to destruction, infiltration, and misuse of information by irresponsible parties. Efforts are needed to overcome this with a security system that can prevent attacks on network systems. A firewall is a solution to prevent this action. Methods that can be applied include the Packet Filtering method. With this method, data traffic will be filtered at the network layer which includes IP addresses and ports. But as security needs increase, a security system is needed that can inspect more than one protocol. This research will combine two methods in one security system, namely the Packet Filtering method and the Application Layer Gateway on the Firewall. By doing a ping test to the targeted website before the Firewall is implemented it will produce Packets: Sent = 4, Received = 4, Lost = 0 (0% loss), and from the results of this research when the Firewall is successfully implemented it will produce Packets: Sent = 4, Received = 0, Loss = 4 (100% loss). From the results of these experiments, it is proven that a Firewall with a combination of Packet Filtering and Application layer Gateway methods is better at anticipating attacks on the network.