Zone-Based Firewall
A firewall that applies security policies based on network zones to control traffic flow.
Understanding Zone-Based Firewall
A Zone-Based Firewall (ZBF) is an advanced firewall model that organizes network interfaces into security zones and applies policies to control traffic flow between them. Unlike traditional access control lists (ACLs), ZBF inspects traffic based on stateful rules and enforces granular security policies.
How Zone-Based Firewall Works
Defining Security Zones
Network interfaces are grouped into zones (e.g., Internal, External, DMZ) based on security levels.
Creating Inter-Zone Policies
Traffic between zones is blocked by default. Custom policies define allowed communication between zones.
Applying Stateful Inspection
The firewall tracks active connections and only permits legitimate responses, preventing unauthorized access.
Best Practices for Zone-Based Firewall Implementation
Define Clear Security Zones – Segment networks based on sensitivity and function.
Apply Least Privilege Policies – Only allow necessary traffic between zones.
Enable Logging and Monitoring – Track suspicious connections and attacks.
Regularly Update Firewall Rules – Adjust security policies as threats evolve.