The security appliance includes three types of firewall rules:
• Default firewall rules: The firewall rules that are defined on the security appliance for all predefined zones and new zones. The default firewall rules cannot be deleted nor edited.
• Custom firewall rules: The firewall rules that are configured by the users. The security appliance supports up to 100 custom firewall rules.
• VPN firewall rules: The firewall rules that are automatically generated by the zone access control settings in your VPN configurations. The VPN firewall rules cannot be edited in the Firewall > Access Control > ACL Rules page. To edit the zone access control settings in your VPN configurations, go to the VPN pages.
All firewall rules are sorted by the priority. The custom firewall rules have the highest priority. The VPN firewall rules have higher priorities than the default firewall rules, but lower than the custom firewall rules.