A DNS relay is an intermediary device that clients send DNS queries to. This intermediary device then forwards the request to upstream DNS servers. Once a response is received, the intermediary device will send the same response back to the original client and cache the response in the event of other clients requiring the same DNS resolution. In the case of the NSX Edge, it acts as the intermediary device and can resolve DNS queries for clients if the clients have IP reachability to the ESG and are configured to use it as a DNS server.
Configuring a DNS relay
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