Understanding Firewall Devices And How They Work

Firewalls are an important tool that helps in safeguarding our networks from malicious attacks. While firewall software is prevalent and common in home computers or small networks, firewall hardware devices are indispensable for large enterprise networks. A firewall sits between a private network and the public internet, and it filters all traffic that passes through it. 

The working principle behind most firewalls is simple to understand. They work by inspecting each packet of data that enters or leaves the network. The firewall examines the packet's source and destination IP addresses, ports, and protocols. It also performs a deep scan for known malicious and harmful signatures in the packet's payload. If the firewall hardware finds a packet that matches a rule that is configured to block traffic, that packet will be dropped. If in case the packet does not match any rules or policies, it will be allowed through the firewall.

Important Features of Firewall Hardware

The firewall accessories are very specialized devices and almost all of these devices have the following key features:

Deep Packet Inspection (DPI): This feature is more commonly known as DPI. Hardware devices can perform deep inspection of the data packets at wire speed, which means that they can analyze and inspect the content of each packet to check for viruses, malware, and intrusion attempts.

Network Segmentation: Firewall hardware devices often support VLANs and network segmentation, which allows the administrators to separate different parts of the network.

IDPS: The Intrusion Detection And Prevention System of the firewall hardware detect and prevent various types of attacks in real time. This can include signature-based detection, anomaly detection, and behavioural analysis.

VPN Support: In most companies, the users often require secure remote access. The firewall VPNs solve this problem and facilitate tunnels, which ensures encrypted and authenticated communication.

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