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DNS content switching / conditional forwarding


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Has anyone come up with a way to selectively forward DNS queries to differing name servers in a way that is usable by ADC itself?

 

I have a customer with a split-brain DNS scenario and want to configure in such a manner that SSL Forward Proxy requests for origin servers on the internet go to public DNS resolvers, whilst ADC has use of internal nameservers for internal lookups e.g. KDC

 

There's no option to configure SSL Proxy vServers to use a distinct forwarders as there used to be when using cache redirection vServers, so you're stuck with whatever is set as a name server for the entire system.

 

I can't select a CS DNS vServer as a nameserver either.

 

The only way forward I can think of is to configure Content Switching for DNS (https://support.citrix.com/article/CTX205898) on a separate ADC instance and configure that IP address as a nameserver on the SSL Forward Proxy instances.

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