DS records setup

[Mark Andrews]

Assuming it is a DNSSEC aware recursive server it asks the COM servers if it
hasn’t cached it as part of the referral process.

[beetle:~/git/bind9] marka% dig ds example.com @a.gtld-servers.net

; <<>> DiG 9.13.1+hotspot+add-prefetch+marka <<>> ds example.com @a.gtld-servers.net
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 57511
;; flags: qr aa rd; QUERY: 1, ANSWER: 6, AUTHORITY: 13, ADDITIONAL: 27
;; WARNING: recursion requested but not available

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

;; ANSWER SECTION:
example.com.		86400	IN	DS	31589 8 1 3490A6806D47F17A34C29E2CE80E8A999FFBE4BE
example.com.		86400	IN	DS	31589 8 2 CDE0D742D6998AA554A92D890F8184C698CFAC8A26FA59875A990C03 E576343C
example.com.		86400	IN	DS	43547 8 1 B6225AB2CC613E0DCA7962BDC2342EA4F1B56083
example.com.		86400	IN	DS	43547 8 2 615A64233543F66F44D68933625B17497C89A70E858ED76A2145997E DF96A918
example.com.		86400	IN	DS	31406 8 1 189968811E6EBA862DD6C209F75623D8D9ED9142
example.com.		86400	IN	DS	31406 8 2 F78CF3344F72137235098ECBBD08947C2C9001C7F6A085A17F518B5D 8F6B916D

;; AUTHORITY SECTION:
com.			172800	IN	NS	b.gtld-servers.net.
com.			172800	IN	NS	a.gtld-servers.net.
com.			172800	IN	NS	e.gtld-servers.net.
com.			172800	IN	NS	h.gtld-servers.net.
com.			172800	IN	NS	k.gtld-servers.net.
com.			172800	IN	NS	i.gtld-servers.net.
com.			172800	IN	NS	j.gtld-servers.net.
com.			172800	IN	NS	c.gtld-servers.net.
com.			172800	IN	NS	f.gtld-servers.net.
com.			172800	IN	NS	l.gtld-servers.net.
com.			172800	IN	NS	d.gtld-servers.net.
com.			172800	IN	NS	m.gtld-servers.net.
com.			172800	IN	NS	g.gtld-servers.net.

;; ADDITIONAL SECTION:
b.gtld-servers.net.	172800	IN	A	192.33.14.30
b.gtld-servers.net.	172800	IN	AAAA	2001:503:231d::2:30
a.gtld-servers.net.	172800	IN	A	192.5.6.30
a.gtld-servers.net.	172800	IN	AAAA	2001:503:a83e::2:30
e.gtld-servers.net.	172800	IN	A	192.12.94.30
e.gtld-servers.net.	172800	IN	AAAA	2001:502:1ca1::30
h.gtld-servers.net.	172800	IN	A	192.54.112.30
h.gtld-servers.net.	172800	IN	AAAA	2001:502:8cc::30
k.gtld-servers.net.	172800	IN	A	192.52.178.30
k.gtld-servers.net.	172800	IN	AAAA	2001:503:d2d::30
i.gtld-servers.net.	172800	IN	A	192.43.172.30
i.gtld-servers.net.	172800	IN	AAAA	2001:503:39c1::30
j.gtld-servers.net.	172800	IN	A	192.48.79.30
j.gtld-servers.net.	172800	IN	AAAA	2001:502:7094::30
c.gtld-servers.net.	172800	IN	A	192.26.92.30
c.gtld-servers.net.	172800	IN	AAAA	2001:503:83eb::30
f.gtld-servers.net.	172800	IN	A	192.35.51.30
f.gtld-servers.net.	172800	IN	AAAA	2001:503:d414::30
l.gtld-servers.net.	172800	IN	A	192.41.162.30
l.gtld-servers.net.	172800	IN	AAAA	2001:500:d937::30
d.gtld-servers.net.	172800	IN	A	192.31.80.30
d.gtld-servers.net.	172800	IN	AAAA	2001:500:856e::30
m.gtld-servers.net.	172800	IN	A	192.55.83.30
m.gtld-servers.net.	172800	IN	AAAA	2001:501:b1f9::30
g.gtld-servers.net.	172800	IN	A	192.42.93.30
g.gtld-servers.net.	172800	IN	AAAA	2001:503:eea3::30

;; Query time: 18 msec
;; SERVER: 192.5.6.30#53(192.5.6.30)
;; WHEN: Thu Feb 21 16:39:15 AEDT 2019
;; MSG SIZE  rcvd: 1088



> On 21 Feb 2019, at 4:19 pm, rams <bramesh80 at gmail.com> wrote:
> 
> Greetings.....!
> 
> how does recursive resolver get the information for a zone example.com in below setup when 
> 
> example.com has DS records in .com 
> 
> .com is tld zone
> example.com is sld zone
> 
> Regards,
> Ramesh
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-- 
Mark Andrews, ISC
1 Seymour St., Dundas Valley, NSW 2117, Australia
PHONE: +61 2 9871 4742              INTERNET: marka at isc.org