Packet-Filtering Firewalls
The packet filtering firewall operates at the network layer 3 of the OSI model. Packet filtering firewalls make processing choice based on network addresses protocols or ports. Packet filtering firewalls are so fast because there is not much logic going behind the decision they make. They did not do any internal inspection of the traffic. They also didn’t store any state information. You have to manually open ports for traffic that will flow through the firewall.
Circuit-Level Gateway
A circuit-level entry monitors communications protocol shake between packets from trustworthy purchasers or servers to untrusted hosts and vice-versa to work out whether or not a requested session is legitimate. To filter packets during this approach, a circuit-level entry depends on information contained within the packet headers for the web. communications protocol session layer protocol. thanks to a circuit-level entry filter packets at the session layer of the OSI model, this entry operates 2 layers over a packet-filtering firewall will.
Stateful Inspection Firewalls
Stateful inspection, also known as dynamic packet filtering, is a firewall technology that monitors the state of active connections & uses this information to determine which network packets to allow through the firewall. In computing, a stateful firewall is a network firewall that tracks the operating state & characteristics of network connections traversing it. a firewall is configured to distinguish legitimate network packets for different types of connections. Only packets matching a known active connection are allowed to pass a firewall. In contrast, the stateless firewall does not take context into account when determining whether to allow or block packets.
Proxy Firewalls (Application-Level Gateways/Cloud Firewalls)
Proxy firewalls operate at the application layer to filter incoming traffic between your network and the traffic source—hence, the name “application-level gateway.” These firewalls are delivered via a cloud-based solution or another proxy device. Rather than letting traffic connect directly proxy firewall first establishes a connection to the source of the traffic & inspects the incoming data packet.
Next-Generation Firewalls
Many of the foremost recently discharged firewall merchandise area unit being touted as Next generation architectures. However, there’s not the maximum amount agreement on what makes a firewall really next generation. the next-generation firewall (NGFW) may be a a part of the third generation of firewall technology, combining a conventional firewall with different network device filtering functionalities, like associate application firewall mistreatment in-line deep packet examination (DPI), associate intrusion hindrance system (IPS). different techniques may also be used, like TLS/SSL encrypted traffic examination, web site filtering, QoS/bandwidth management, antivirus examination & third-party identity management integration
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