Re: Re: checkhints: view “internal”: b.root-servers.net/AAAA (2001:500:200::b) extra record in hints

Mark Andrews marka at isc.org
Mon Sep 11 00:15:36 UTC 2017


In message <e6f2c93a-c0a4-71ec-b753-fcfb48c07bb2 at acm.org>, Timothe Litt writes:
> The most sensible thing to do is ignore the message, and keep named
> reasonably up-to-date.

Well something in the resolution path is changing the answer to
return the old AAAA address which is why I suggested that there may
be a forwarder involved.  One should get a answer like this from
all of the root server addresses.  The exact ordering of the records
may differ.  If one doesn't then something on the path is modifying
the response.

; <<>> DiG 9.12.0-pre-alpha+hotspot+add-prefetch+marka <<>> ns . +norec @a.root-servers.net
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 29723
;; flags: qr aa; QUERY: 1, ANSWER: 13, AUTHORITY: 0, ADDITIONAL: 27

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 1232
;; QUESTION SECTION:
;.				IN	NS

;; ANSWER SECTION:
.			518400	IN	NS	a.root-servers.net.
.			518400	IN	NS	b.root-servers.net.
.			518400	IN	NS	c.root-servers.net.
.			518400	IN	NS	d.root-servers.net.
.			518400	IN	NS	e.root-servers.net.
.			518400	IN	NS	f.root-servers.net.
.			518400	IN	NS	g.root-servers.net.
.			518400	IN	NS	h.root-servers.net.
.			518400	IN	NS	i.root-servers.net.
.			518400	IN	NS	j.root-servers.net.
.			518400	IN	NS	k.root-servers.net.
.			518400	IN	NS	l.root-servers.net.
.			518400	IN	NS	m.root-servers.net.

;; ADDITIONAL SECTION:
a.root-servers.net.	518400	IN	A	198.41.0.4
b.root-servers.net.	518400	IN	A	192.228.79.201
c.root-servers.net.	518400	IN	A	192.33.4.12
d.root-servers.net.	518400	IN	A	199.7.91.13
e.root-servers.net.	518400	IN	A	192.203.230.10
f.root-servers.net.	518400	IN	A	192.5.5.241
g.root-servers.net.	518400	IN	A	192.112.36.4
h.root-servers.net.	518400	IN	A	198.97.190.53
i.root-servers.net.	518400	IN	A	192.36.148.17
j.root-servers.net.	518400	IN	A	192.58.128.30
k.root-servers.net.	518400	IN	A	193.0.14.129
l.root-servers.net.	518400	IN	A	199.7.83.42
m.root-servers.net.	518400	IN	A	202.12.27.33
a.root-servers.net.	518400	IN	AAAA	2001:503:ba3e::2:30
b.root-servers.net.	518400	IN	AAAA	2001:500:200::b
c.root-servers.net.	518400	IN	AAAA	2001:500:2::c
d.root-servers.net.	518400	IN	AAAA	2001:500:2d::d
e.root-servers.net.	518400	IN	AAAA	2001:500:a8::e
f.root-servers.net.	518400	IN	AAAA	2001:500:2f::f
g.root-servers.net.	518400	IN	AAAA	2001:500:12::d0d
h.root-servers.net.	518400	IN	AAAA	2001:500:1::53
i.root-servers.net.	518400	IN	AAAA	2001:7fe::53
j.root-servers.net.	518400	IN	AAAA	2001:503:c27::2:30
k.root-servers.net.	518400	IN	AAAA	2001:7fd::1
l.root-servers.net.	518400	IN	AAAA	2001:500:9f::42
m.root-servers.net.	518400	IN	AAAA	2001:dc3::35

;; Query time: 179 msec
;; SERVER: 2001:503:ba3e::2:30#53(2001:503:ba3e::2:30)
;; WHEN: Mon Sep 11 10:09:10 AEST 2017
;; MSG SIZE  rcvd: 811

-- 
Mark Andrews, ISC
1 Seymour St., Dundas Valley, NSW 2117, Australia
PHONE: +61 2 9871 4742                 INTERNET: marka at isc.org


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