DNS settings

Domain Name System (DNS) translates human readable domain names to machine-readable IP addresses, and vice versa. Citrix SD-WAN provides the following DNS features:

  • DNS Proxy
  • DNS Transparent Forwarding

To configure DNS settings, in the Site configuration page, navigate to Configuration > Advanced Settings > select DNS tab.

Site config dns settings

Site specific DNS servers

Click + DNS Server to configure site-specific DNS servers to which the DNS requests are routed.

Enter a name for the DNS server and specify the Primary and Secondary DNS server IP addresses.

Site specific dns servers

DNS proxy

DNS proxy intercepts the DNS requests destined to SD-WAN IP address and forwards it to the selected DNS servers. You can configure a proxy with multiple forwarders that helps steering DNS requests based on application domain names.

Site specific dns servers

  • DNS proxy settings:
    • DNS Proxy Name: Name of the DNS Proxy.
    • Interfaces to intercept DNS requests: The interfaces on which the DNS requests is intercepted. Only trusted interfaces are allowed.
    • Default DNS Server for all traffic: The default DNS server to which the DNS requests is forwarded to, if none of the applications match in DNS forwarder look-up.
  • App specific DNS Forwarding rules:
    • Application: Applications for which DNS requests have to be forwarded to the selected DNS server.
    • DNS Server: The DNS server that the DNS request is forwarded to for the specified application.

DNS transparent forwarders

Citrix SD-WAN can be configured as a transparent DNS forwarder. In this mode, SD-WAN can intercept DNS requests that are not destined to its IP address and forward them to the specified DNS servers. Only the DNS requests coming from local service on trusted interfaces are intercepted. If the DNS requests match any applications in the DNS forwarder list, then it is forwarded to the configured DNS service.

Dns transparent forwarder

  • Application: Applications for which DNS requests have to be forwarded to the selected DNS server.
  • DNS Server: The DNS server that the DNS request is forwarded to for the specified application.