Network Address Translation (NAT) Firewalls.

Stateful Multi-layer Inspection (SMLI) Firewalls.Application-level Gateways (Proxy Firewalls).The following are types of firewall techniques that can be implemented as software or hardware: This type of firewall is also called a Host Firewall.īesides, there are many other types of firewalls depending on their features and the level of security they provide. On the other hand, a software firewall is a simple program installed on a computer that works through port numbers and other installed software. A hardware firewall is sometimes referred to as an Appliance Firewall. However, it is best practice to have both to achieve maximum possible protection.Ī hardware firewall is a physical device that attaches between a computer network and a gateway. Each type of firewall has different functionality but the same purpose. There are mainly three types of firewalls, such as software firewalls, hardware firewalls, or both, depending on their structure.

Firewall circuit level gateway