Components of a Security Policy Rule
The Security policy rule construct permits a combination of the required and optional fields as detailed in the following table:
A label that supports up to 63 characters, used to identify the rule.
Specifies whether the rule applies to traffic within a zone, between zones, or both:
The zone from which the traffic originates.
The zone at which the traffic terminates. If you use NAT, make sure to always reference the post-NAT zone.
The application which you wish to control. The firewall uses App-ID, the traffic classification technology, to identify traffic on your network. App-ID provides application control and visibility in creating security policies that block unknown applications, while enabling, inspecting, and shaping those that are allowed.
Specifies an Allow or Block action for the traffic based on the criteria you define in the rule. When you configure the firewall to block traffic, it either resets the connection or silently drops packets. To provide a better user experience, you can configure granular options to block traffic instead of silently dropping packets, which can cause some applications to break and appear unresponsive to the user. For more details, see Security Policy Actions.
A text field, up to 1024 characters, used to describe the rule.
Source IP Address
Define host IP or FQDN, subnet, named groups, or country-based enforcement. If you use NAT, make sure to always refer to the original IP addresses in the packet (i.e. the pre-NAT IP address).
Destination IP Address
The location or destination for the traffic. If you use NAT, make sure to always refer to the original IP addresses in the packet (i.e. the pre-NAT IP address).
Using the URL Category as match criteria allows you to customize security profiles (Antivirus, Anti-Spyware, Vulnerability, File-Blocking, Data Filtering, and DoS) on a per-URL-category basis. For example, you can prevent.exe file download/upload for URL categories that represent higher risk while allowing them for other categories. This functionality also allows you to attach schedules to specific URL categories (allow social-media websites during lunch & after-hours), mark certain URL categories with QoS (financial, medical, and business), and select different log forwarding profiles on a per-URL-category-basis.
Although you can manually configure URL categories on your firewall, to take advantage of the dynamic URL categorization updates available on the Palo Alto Networks firewalls, you must purchase a URL filtering license.
To block or allow traffic based on URL category, you must apply a URL Filtering profile to the security policy rules. Define the URL Category as Any and attach a URL Filtering profile to the security policy. See Set Up a Basic Security Policy for information on using the default profiles in your security policy and see Control Access to Web Content for more details.
Allows you to select a Layer 4 (TCP or UDP) port for the application. You can choose any, specify a port, or use application-default to permit use of the standards-based port for the application. For example, for applications with well- known port numbers such as DNS, the application-default option will match against DNS traffic only on TCP port 53. You can also add a custom application and define the ports that the application can use.
For inbound allow rules (for example, from untrust to trust), using application-default prevents applications from running on unusual ports and protocols. Application-default is the default option; while the firewall still checks for all applications on all ports, with this configuration, applications are only allowed on their standard ports/protocols.
Allows you to identify clients with Host Information Profile (HIP) and then enforce access privileges.
Allow you to define logging for the session, log forwarding settings, change Quality of Service (QoS) markings for packets that match the rule, and schedule when (day and time) the security rule should be in effect.
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