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Jossef Harush Kadouri
Asked: 2019-07-08 23:58:17 +0800 CST

DNS server - respond to client with "go resolve from that DNS server"

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I'm trying to figure out how to build a DNS response that refers the requesting client to try resolve from a different DNS server.

For example,

  1. Client PC makes a request to resolve A record "google.com" from DNS server #1
  2. DNS server #1 reply with a referral to DNS server #2
  3. Client PC makes a request to resolve A record "google.com" from DNS server #2
  4. DNS server #2 reply with a matching A record for "google.com"

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How to build a DNS response that refers the client to try resolve from a different DNS server?

Note - I know the best practice is to set the DNS server to recurse the request. However, I purposely want the client to do the hard work.

domain-name-system

1 Answers

  1. Best Answer

    Most clients have a stub resolver so I'm not sure they will be capable of handling anything other than a basic "here's the address / not found" response.

    The Windows DNS client is a stub resolver, which means that when it needs to resolve a DNS name, it issues a single recursive query to the primary DNS server that is configured on its network interface.

    As long as that DNS server responds, no other DNS queries are issued. The DNS server is responsible for handling all additional tasks that are necessary to resolve the DNS query, and the final result is returned to the DNS client.

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