Strange response with option "minimal-response YES"

xdong xudong12 at huawei.com
Wed Mar 14 09:23:05 UTC 2018


Hi all,

    My server is a caching-only server, and provides recursive service with 
"minimal-response YES". when i digged some domain name, my server answered
with all fields « ADDITIONAL RECORDS » and « AUTHORITATIVE NAMESERVERS »
fill with the DNS root server. I think this is WRONG and useless.


/
Just like as following:
% dig @127.0.0.1 plaid.princeton.edu. A

; <<>> DiG 9.11.2 <<>> @127.0.0.1 plaid.princeton.edu. A
; (1 server found)
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 4208
;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 13, ADDITIONAL: 27

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 4096
; COOKIE: fb305a768a4968defdf64dd65a830468abe3a7b146678e56 (good)
;; QUESTION SECTION:
;plaid.princeton.edu. IN A

;; ANSWER SECTION:
plaid.Princeton.EDU. 43137 IN A 140.180.226.197

;; AUTHORITY SECTION:
. 518385 IN NS l.root-servers.net.
. 518385 IN NS f.root-servers.net.
. 518385 IN NS k.root-servers.net.
. 518385 IN NS b.root-servers.net.
. 518385 IN NS g.root-servers.net.
. 518385 IN NS j.root-servers.net.
. 518385 IN NS h.root-servers.net.
. 518385 IN NS d.root-servers.net.
. 518385 IN NS i.root-servers.net.
. 518385 IN NS a.root-servers.net.
. 518385 IN NS e.root-servers.net.
. 518385 IN NS m.root-servers.net.
. 518385 IN NS c.root-servers.net.

;; ADDITIONAL SECTION:
a.root-servers.net. 604785 IN A 198.41.0.4
b.root-servers.net. 604785 IN A 199.9.14.201
c.root-servers.net. 604785 IN A 192.33.4.12
d.root-servers.net. 604785 IN A 199.7.91.13
e.root-servers.net. 604785 IN A 192.203.230.10
f.root-servers.net. 604785 IN A 192.5.5.241
g.root-servers.net. 604785 IN A 192.112.36.4
h.root-servers.net. 604785 IN A 198.97.190.53
i.root-servers.net. 604785 IN A 192.36.148.17
j.root-servers.net. 604785 IN A 192.58.128.30
k.root-servers.net. 604785 IN A 193.0.14.129
l.root-servers.net. 604785 IN A 199.7.83.42
m.root-servers.net. 604785 IN A 202.12.27.33
a.root-servers.net. 604785 IN AAAA 2001:503:ba3e::2:30
b.root-servers.net. 604785 IN AAAA 2001:500:200::b
c.root-servers.net. 604785 IN AAAA 2001:500:2::c
d.root-servers.net. 604785 IN AAAA 2001:500:2d::d
e.root-servers.net. 604785 IN AAAA 2001:500:a8::e
f.root-servers.net. 604785 IN AAAA 2001:500:2f::f
g.root-servers.net. 604785 IN AAAA 2001:500:12::d0d
h.root-servers.net. 604785 IN AAAA 2001:500:1::53
i.root-servers.net. 604785 IN AAAA 2001:7fe::53
j.root-servers.net. 604785 IN AAAA 2001:503:c27::2:30
k.root-servers.net. 604785 IN AAAA 2001:7fd::1
l.root-servers.net. 604785 IN AAAA 2001:500:9f::42
m.root-servers.net. 604785 IN AAAA 2001:dc3::35

;; Query time: 1 msec
;; SERVER: 127.0.0.1#53(127.0.0.1)
;; WHEN: Tue Feb 13 10:29:44 EST 2018
;; MSG SIZE rcvd: 894/


So, i want to know why this happened? Anybody can help me ?




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