Use Case 2: ISP Tenant Uses DNS Proxy to Handle DNS Resolution for Security Policies, Reporting, and Services within its Virtual System
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- Decryption Overview
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- DNS Overview
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- Use Case 1: Firewall Requires DNS Resolution
- Use Case 2: ISP Tenant Uses DNS Proxy to Handle DNS Resolution for Security Policies, Reporting, and Services within its Virtual System
- Use Case 3: Firewall Acts as DNS Proxy Between Client and Server
- DNS Proxy Rule and FQDN Matching
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- NAT Rule Capacities
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- Translate Internal Client IP Addresses to Your Public IP Address (Source DIPP NAT)
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- Configure Destination NAT with DNS Rewrite
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- Policy Types
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- External Dynamic List
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- Network Segmentation Using Zones
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PAN-OS 11.1 & Later
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- Tap Interfaces
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- Layer 2 and Layer 3 Packets over a Virtual Wire
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- DNS Overview
- DNS Proxy Object
- DNS Server Profile
- Multi-Tenant DNS Deployments
- Configure a DNS Proxy Object
- Configure a DNS Server Profile
- Use Case 1: Firewall Requires DNS Resolution
- Use Case 2: ISP Tenant Uses DNS Proxy to Handle DNS Resolution for Security Policies, Reporting, and Services within its Virtual System
- Use Case 3: Firewall Acts as DNS Proxy Between Client and Server
- DNS Proxy Rule and FQDN Matching
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- NAT Rule Capacities
- Dynamic IP and Port NAT Oversubscription
- Dataplane NAT Memory Statistics
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- Translate Internal Client IP Addresses to Your Public IP Address (Source DIPP NAT)
- Create a Source NAT Rule with Persistent DIPP
- PAN-OS
- Strata Cloud Manager
- Enable Clients on the Internal Network to Access your Public Servers (Destination U-Turn NAT)
- Enable Bi-Directional Address Translation for Your Public-Facing Servers (Static Source NAT)
- Configure Destination NAT with DNS Rewrite
- Configure Destination NAT Using Dynamic IP Addresses
- Modify the Oversubscription Rate for DIPP NAT
- Reserve Dynamic IP NAT Addresses
- Disable NAT for a Specific Host or Interface
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End-of-Life (EoL)
Use Case 2: ISP Tenant Uses DNS Proxy to Handle DNS Resolution for Security Policies, Reporting, and Services within its Virtual System
In this use case, multiple tenants (ISP subscribers)
are defined on the firewall and each tenant is allocated a separate
virtual system (vsys) and virtual router in order to segment its
services and administrative domains. The following figure illustrates
several virtual systems within a firewall.
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Each tenant
has its own server profiles for Security policy rules, reporting,
and management services (such as email, Kerberos, SNMP, syslog,
and more) defined in its own networks.
For the DNS resolutions
initiated by these services, each virtual system is configured with
its own DNS Proxy Object to
allow each tenant to customize how DNS resolution is handled within
its virtual system. Any service with a Location will
use the DNS Proxy object configured for the virtual system to determine
the primary (or secondary) DNS server to resolve FQDNs, as illustrated
in the following figure.
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- For each virtual system, specify the DNS Proxy
to use.
- Select DeviceVirtual Systems and Add the ID of the virtual system (range is 1-255), and an optional Name, in this example, Corp1 Corporation.
- On the General tab, choose a DNS Proxy or create a new one. In this example, Corp1 DNS Proxy is selected as the proxy for Corp1 Corporation’s virtual system.
- For Interfaces, click Add. In this example, Ethernet1/20 is dedicated to this tenant.
- For Virtual Routers, click Add. A virtual router named Corp1 VR is assigned to the virtual system in order to separate routing functions.
- Click OK.
- Configure a DNS Proxy and a server profile to support
DNS resolution for a virtual system.
- Select NetworkDNS Proxy and click Add.
- Click Enable and enter a Name for the DNS Proxy.
- For Location, select the virtual system of the tenant, in this example, Corp1 Corporation (vsys6). (You could choose the Shared DNS Proxy resource instead.)
- For Server Profile, choose
or create a profile to customize DNS servers to use for DNS resolutions
for this tenant’s security policy, reporting, and server profile
services.If the profile is not already configured, in the Server Profile field, click DNS Server Profile to Configure a DNS Server Profile.The DNS server profile identifies the IP addresses of the primary and secondary DNS server to use for management DNS resolutions for this virtual system.
- Also for this server profile, optionally configure a Service Route IPv4 and/or a Service Route IPv6 to instruct the firewall which Source Interface to use in its DNS requests. If that interface has more than one IP address, configure the Source Address also.
- Select the Advanced tab. Ensure that Cache is enabled and Cache EDNS Responses is enabled (both are enabled by default). This is required if the DNS proxy object is used under DeviceVirtual SystemsvsysGeneralDNS Proxy.
- Click OK.
- Click OK and Commit.Optional advanced features such as split DNS can be configured using DNS Proxy Rules. A separate DNS server profile can be used to redirect DNS resolutions matching the Domain Name in a DNS Proxy Rule to another set of DNS servers, if required. Use Case 3 illustrates split DNS.If you use two separate DNS server profiles in the same DNS Proxy object, one for the DNS Proxy and one for the DNS proxy rule, the following behaviors occur:
- If a service route is defined in the DNS server profile used by the DNS Proxy, it takes precedence and is used.
- If a service route is defined in the DNS server profile used in the DNS proxy rules, it is not used. If the service route differs from the one defined in the DNS server profile used by the DNS Proxy, the following warning message is displayed during the Commit process:
Warning: The DNS service route defined in the DNS proxy object is different from the DNS proxy rule’s service route. Using the DNS proxy object’s service route.
- If no service route is defined in any DNS server profile, the global service route is used if needed.