DNS Resolution for Mobile Users—GlobalProtect and Remote Network Deployments
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Prisma Access

DNS Resolution for Mobile Users—GlobalProtect and Remote Network Deployments

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DNS Resolution for Mobile Users—GlobalProtect and Remote Network Deployments

Shows the possible configurations you can use for Prisma Access to resolve DNS queries for mobile users and remote networks.
Where Can I Use This?
What Do I Need?
  • Prisma Access (Cloud Management)
  • Prisma Access (Panorama Managed)
  • Prisma Access
    license version 2.2 Preferred and later
Prisma Access allows you to specify DNS servers to resolve both domains that are internal to your organization and external domains. Prisma Access proxies the DNS request based on the configuration of your DNS servers. The following table shows the supported DNS resolution methods for internal and external domains and indicates when Prisma Access proxies the DNS requests.
Internal DNS Resolution Method
External DNS Resolution Method
Prisma Access Proxies the DNS Request (Yes/No)
Single rule, DNS server configured for Internal Domains
Cloud Default
Yes
Single rule, DNS server configured for Internal Domains
Same as Internal Domains
No
Single rule, DNS server configured for Internal Domains
Custom DNS server
Yes
Single rule, Cloud Default set for a domain
Cloud Default
Yes
Single rule, Cloud Default set for a domain
Same as Internal Domains
Yes
Single rule, Cloud Default set for domain
Custom DNS server
Yes
Multiple rules, DNS server configured for Internal Domains
Cloud Default
Yes
Multiple rules, DNS server configured for Internal Domains
Same as Internal Domains
Yes
Multiple rules, DNS server configured for Internal Domains
Custom DNS server
Yes
No configuration
Custom DNS Server
Yes
No configuration
Cloud Default
No
No configuration
No configuration
No
No DNS resolution specified (default configuration is present, which uses Cloud Default)
No DNS resolution specified
No
The source IP address of the DNS request depends on whether or not Prisma Access proxies the DNS request.
  • When Prisma Access does not proxy the DNS requests, the source IP address of the DNS request changes to the IP address of the device that requested the DNS lookup. This source IP address allows you to enforce source IP address-based DNS policies or identify endpoints that communicate with malicious domains. This behavior applies for both mobile users and remote network deployments.
  • When Prisma Access proxies the DNS requests, the source IP address of the DNS request changes to the following addresses:
    • Mobile User deployments
      —The source IP address of the DNS request is an IP address taken from the mobile user IP address pool for internal requests and the mobile user location’s gateway IP address for external requests.
    • Remote Network deployments
      —The source IP address of the DNS request is the
      EBGP Router Address
      for internal requests and the Service IP Address of the remote network connection for external requests.
The following guidelines and restrictions apply to using DNS resolution with Prisma Access:
  • The maximum number of concurrent pending TCP DNS requests (
    Max Pending Requests
    ) that Prisma Access supports is 64.
  • For UDP queries, the DNS proxy sends another request if it hasn’t received a response in 2 seconds, and retries a maximum of 5 times before trying the next DNS server.
  • Prisma Access caches the DNS entries with a time-to-live (TTL) value of 300 seconds. EDNS responses are also cached.

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