Within larger enterprise networks, packet filtering firewalls can be integral components of a multilayered defense strategy, especially between internal departments. They are also an adequate solution for budget-constrained, smaller organizations to provide at least a basic level of protection against known threats, a significant advantage over having no firewall protection at all. Packet filtering firewalls are best suited for situations where a lower level of security is acceptable. Common use cases for packet filtering firewall Packet filtering firewalls are implemented on the network layer of the Open Systems Interconnection (OSI) model. When a packet does not pass muster according to the pre-established rules (called access control lists), it is flagged and usually, dropped (not forwarded on to other network segments). Instead, this type of firewall compares packets to a set of pre-established criteria that typically includes attributes like: Unlike some other firewall types, packet filtering firewalls do not route packets. Packet filtering firewalls are placed at junctions within enterprise networks where routers and switches are located. On their own, packet filtering firewalls are not sufficient for protecting enterprise network architectures. As such, this firewall type is more limited in the level of protection it can provide. Packet filtering firewalls are among the earliest types of firewalls. There are five basic categories of firewalls:įor more information, also see: What is Firewall as a Service? Packet Filtering Firewalls This guide will help you determine which level of firewall protection may be right for you. While virtually every networked organization should have some level of firewall control, not every network will require the most expensive, state-of-the-art firewalls on the market. Ideally, firewalls block dangerous traffic and allow non-threatening traffic. Firewalls are network security devices that monitor and filter traffic as it flows to, from, and across networks based on a given enterprise’s pre-established security policies.
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