Security Features : Configuring a firewall policy
 
Configuring a firewall policy
A firewall policy is a filter that allows or denies traffic based on a matching tuple: source address, destination address, and service. By default, firewall policy rules are stateful: if client-to-server traffic is allowed, the session is maintained in a state table, and the response traffic is allowed.
The FortiADC system evaluates firewall policies before other rules. It matches traffic against the firewall policy table, beginning with the first rule. If a rule matches, the specified action is taken. If the session is denied by a firewall policy rule, it is dropped. If the session is accepted, system processing continues.
By default, if firewall rules are not configured, the system does not perform firewall processing; all traffic is processed as if the system were a router, and traffic is forwarded according to routing and other system rules.
Note: You do not need to create firewall rules for routine management traffic associated with the management port or HA ports. The interface “allow access” option enables permitted protocols. The system automatically permits from-self traffic, such as health check traffic, and expected responses.
Before you begin:
• You must have a good understanding and knowledge of firewalls.
• You must have created the address configuration objects and service configuration objects that define the matching tuple in your firewall policy rules.
• You must have Read-Write permission for Firewall settings.
To configure a firewall:
1. Go to Security > [Firewall Policy | Firewall IPv6 Policy].
2. Click Add to display the configuration editor.
3. Complete the configuration as described in Table 46.
4. Save the configuration.
5. Reorder rules, as necessary.
Table 46: Firewall policy configuration
Settings
Guidelines
Default Action
Action when no rule matches or no rules are configured:
• Deny—Drop the traffic.
• Accept—Allow the traffic to pass the firewall.
Rule
Name
Configuration name. Valid characters are A-Z, a-z, 0-9, _, and -. No spaces.
After you initially save the configuration, you cannot edit the name.
Ingress Interface
Select the interface that receives traffic.
Egress Interface
Select the interface that forwards traffic.
Source
Select a source address object to use to form the matching tuple.
Destination
Select a destination address object to use to form the matching tuple.
Service
Select a service object to use to form the matching tuple.
Action
• Deny—Drop the traffic.
• Accept—Allow the traffic to pass the firewall.
Reordering
After you have saved a rule, reorder rules as necessary. The rules table is consulted from top to bottom. The first rule that matches is applied and subsequent rules are not evaluated.