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Root servers returned with every DNS query

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edited Jun 30, 2020 1:06PM in Oracle Cloud Infrastructure - General 9 comments

Summary

Every time I make a DNS query to the Compute instance's internal DNS resolver, the root servers are returned along with the answer, creating additional bandwidth and latency.

Content

Why does every query return the root servers, and can this behaviour be changed?

 

An example query sent to instance internal resolver:

 

; <<>> DiG 9.16.1-Ubuntu <<>> oracle.com @169.254.169.254
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 2652
;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 13, ADDITIONAL: 1

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 4096
;; QUESTION SECTION:
;oracle.com.                    IN      A

;; ANSWER SECTION:
oracle.com.             110     IN      A       137.254.120.50

;; AUTHORITY SECTION:
.                       456201  IN      NS      f.root-servers.net.

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