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In Palo Alto Networks firewalls, when multiple static routes exist for the same destination, the firewall uses the administrative distance (AD) to determine route priority. The AD is a metric that indicates the trustworthiness of a route, with lower values indicating higher priority. For static routes, the default AD is 10, but this can be manually adjusted. The route with the lowest AD is preferred and added to the routing table. If AD values are equal, the firewall then considers the metric (default 10), but AD is the primary differentiator.

To configure SSL Forward Proxy decryption on a Palo Alto Networks firewall, certain key components must be set up to ensure secure and effective decryption and inspection of SSL/TLS encrypted traffic:

B. Define a Forward Trust Certificate:

A Forward Trust Certificate is essential for SSL Forward Proxy decryption. This certificate is used by the firewall to dynamically generate certificates for SSL sites that are trusted. When the firewall decrypts and inspects the traffic and then re-encrypts it, the new certificate presented to the client comes from the Forward Trust Certificate authority. This certificate must be trusted by client devices, often requiring the Forward Trust CA certificate to be distributed and installed on client devices.

C. Configure SSL decryption rules:

SSL decryption rules are the policies that determine which traffic is to be decrypted. These rules specify the source, destination, service, and URL category, among other criteria. The rules define what traffic the SSL Forward Proxy will apply to, enabling selective decryption based on security and privacy requirements.

Together, these components form the basis of the SSL Forward Proxy decryption setup, allowing for the decryption, inspection, and re-encryption of SSL/TLS encrypted traffic to identify and prevent threats hidden within encrypted sessions.