Types of Firewall in Cyber Security

Types of Firewall:

A firewall is usually a device (a router or a computer or a combination thereof) installed between the internal network of a company and the rest of the world. There are Two Types of Firewall in Cyber Security:

    1. Packet-Filter Firewall
    2. Proxy Firewall

Packet-Filter Firewall: Any standard router with some extra functionality can act as a packet-filter firewall. It can forward or block incoming packets based on some criteria to be fulfilled with the information in the network. Transport layer headers: Source IP address, Destination IP address, source port address, destination port address and type of protocol. All it does is that it allows a filtering table to decide which packet is to forward and which is to block.

Proxy Firewall: Packet-Filter Firewall works on the information available in the network and transport layer header. But sometimes it is required to filter packets based on the information available in the message itself.

A proxy firewall is usually a computer, commonly known as Application Gateway which lies between the client and the server. When a client sends a message, the proxy firewall runs the server process to receive the request. the server opens the packet at the application level and examines it. If it finds the client as a permitted client then it acts as a client process and sends the message to the real server of the company. On the other hand, if it finds the client as a false one then it drops the message and sends an error message to the client.