Scenario: A Citrix Administrator configured a global server load balancing (GSLB) setup for internal and external users using the same host name. For…

The scenario requires providing different DNS responses for the same fully qualified domain name (FQDN) based on the client's network location (internal or external). This is a classic split-DNS or split-horizon DNS use case. The Citrix ADC DNS View feature is designed specifically for this purpose. It allows the administrator to create different DNS zones, or "views," and associate them with specific client subnets. When a DNS query arrives, the Citrix ADC checks the source IP address, matches it to a view, and returns the DNS records configured for that specific view.

A. DNS Preferred Location: This is a Global Server Load Balancing (GSLB) feature that directs clients to a preferred GSLB service based on their subnet, but it does not fundamentally change the DNS record returned.

B. DNS Record: A standard DNS record (e.g., A, CNAME) on its own cannot provide different responses based on the source of the query; it resolves the same for all clients.

D. DNS Proxy: The DNS Proxy feature on a Citrix ADC forwards DNS queries to backend name servers and caches the responses. It does not have the native capability to serve different records based on client views.

1. Citrix ADC 13.1 Product Documentation

"Configuring DNS Views": "You can configure the Citrix ADC appliance to provide different answers to DNS queries for the same domain name

depending on the source of the query. For example

you can configure the appliance to resolve a domain name to an internal IP address for queries from internal clients and to an external IP address for queries from external clients."

Source: Citrix Official Documentation. Located under the "DNS > Configuring DNS Views" section.

2. Citrix ADC 13.1 Product Documentation

"Configuring a DNS Proxy": "A DNS proxy server is a server that forwards DNS requests to a name server and caches the responses. Subsequent requests for the same domain name are served from the cache

which reduces the response time."

Source: Citrix Official Documentation. Located under the "DNS > Configuring a DNS Proxy" section. This reference clarifies that a proxy's function is forwarding and caching

not serving different views.

3. Citrix ADC 13.1 Product Documentation

"Proximity-Based Global Server Load Balancing": "The Preferred Location parameter specifies a list of client subnets. If the IP address of the local DNS server that sends the request to the GSLB virtual server is in one of these subnets

the ADC appliance selects the GSLB services bound to this GSLB virtual server."

Source: Citrix Official Documentation. Located under the "Global Server Load Balancing > Proximity-Based Global Server Load Balancing" section. This explains that Preferred Location is for GSLB service selection

not for creating distinct DNS views.