To configure firewall functions, create zones. Then you can deploy security services according to the priorities of the zones. The device considers that data transmission within a zone is reliable and does not enforce any security policy on intra-zone data transmission. The device verifies data and enforces security policies only when the data is transmitted from one zone to another.

You must configure a priority for a zone before making other configurations. The priority cannot be changed. Each zone must have a different priority. A larger priority value indicates a higher priority.

The firewall takes effect only after interfaces are added to zones.

The device automatically creates a zone named Local. The Local zone has the highest priority and cannot be deleted. In addition, the priority of this zone cannot be changed, and no interface can be added to this zone. To apply the firewall function to the control packets that need to be processed by the device, use the Local zone.