The firewall uses the management (MGT) interface by default to access external services, such as DNS servers, external authentication servers, Palo Alto Networks services such as software, URL updates, licenses and AutoFocus. An alternative to using the MGT interface is to configure a data port (a regular interface) to access these services. The path from the interface to the service on a server is known as a service route. The service packets exit the firewall on the port assigned for the external service and the server sends its response to the configured source interface and source IP address.
When set to default settings, certain services (such as External Dynamic Lists and URL updates) use service route settings that are inherited by a parent service (in this case, Palo Alto Networks Services) if it is explicitly configured with an interface. If the defaults are not used, Palo Alto Networks recommends configuring each of the services that you use with an interface to ensure that the proper service route is used.
You can configure service routes globally for the firewall (shown in the following task) or Customize Service Routes for a Virtual System on a firewall enabled for multiple virtual systems so that you have the flexibility to use interfaces associated with a virtual system. Any virtual system that does not have a service route configured for a particular service inherits the interface and IP address that are set globally for that service.
The following procedure enables you to change the interface the firewall uses to send requests to external services.
- Customize service routes.
- Select(omit Global on a firewall without multiple virtual system capability), and in the Services Features section, clickDeviceSetupServicesGlobalService Route Configuration.
- SelectCustomizeand do one of the following to create a service route:
- For a predefined service:
- SelectIPv4orIPv6and click the link for the service for which you want customize the service route.To easily use the same source address for multiple services, select the checkbox for the services, clickSet Selected Routes, and proceed to the next step.
- To limit the drop-down list for Source Address, select aSource Interface; then select aSource Address(from that interface) as the service route. An Address Object can also be referenced as a Source Address if it is already configured on the selected interface. SelectingAnySource Interface makes all IP addresses on all interfaces available in the Source Address drop-down from which you select an address. SelectingUse defaultcauses the firewall to use the management interface for the service route, unless the packet destination IP address matches the configured Destination IP address, in which case the source IP address is set to theSource Addressconfigured for theDestination. SelectingMGTcauses the firewall to use the MGT interface for the service route, regardless of any destination service route.The Service Route Source Address does not inherit configuration changes from the referenced interface and vice versa. Modification of an Interface IP Address to a different IP address or Address Object will not update a corresponding Service Route Source Address. This may lead to commit failure and require you to update the Service Route(s) to a valid Source Address value.
- ClickOKto save the setting.
- Repeat this step if you want to specify both an IPv4 and IPv6 address for a service.
- For a destination service route:
- SelectDestinationandAddaDestinationIP address. In this case, if a packet arrives with a destination IP address that matches this configuredDestinationaddress, then the source IP address of the packet will be set to theSource Addressconfigured in the next step.
- To limit the drop-down list for Source Address, select aSource Interface; then select aSource Address(from that interface) as the service route. SelectingAnySource Interface makes all IP addresses on all interfaces available in the Source Address drop-down from which you select an address. SelectingMGTcauses the firewall to use the MGT interface for the service route.
- ClickOKto save the setting.
- Repeat the prior steps for each service route you want to customize.
- ClickOKto save the service route configuration.
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