Hi there,
I have 2 DNS servers in DMZ that are set as Forwarders to the internal DNS servers
both servers are running Windows Server 2012 R2 - Standard, with up-to-date patches
In these 2 DMZ servers, I have set my ISP forwarders (lets say ISP-01 & ISP-02)
I want to restrict these DMZ servers to use ISP-01, and use ISP-02 only if ISP-01 fails
I have disabled Round Robin, and increased the Query Time Out to 10 Seconds, but still Queries are sent to ISP-02
I used Microsoft Message Analyzer to capture the traffic and view DNS queries
Is there a way to achieve this and use Forwarders as a Primary/Secondary scenario?
This is a requirement by my ISP, cause ISP-02 is in a DR site, and should be used only when required