The hints hopefully point eventually to an authoritative server for ".".
Whatever that authoritative server says overrides any hints, just like any
other zone's authoritative NS. It does not matter how obsolete a delegation
is, so long as some authoritative NS replies, the data from the delegation
(hints) no longer matters.
HtHLen
On Monday, June 15, 2015 6:14 AM, Gaurav Kansal <[email protected]>
wrote:
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1.0in 1.0in 1.0in;}#yiv5613757701 div.yiv5613757701WordSection1 {}-->Dear Team,
My caching DNS server is generating log of . NS queries to ROOT Servers. I
have a hint file in my bind configuration and the same is up-to date. The same
behavior is occurring in multiple versions of BIND (tested on 9.7, 9.9 and on
9.10). It must be for some purpose (may be BIND doesn’t trust hint file and
cross check it from root servers).Can anyone put some light on this. Sample
tcpdump output :-15:36:42.440831 IP anydnsmby.27938 >
k.root-servers.net.domain: 38907 [1au] NS? . (28)15:36:43.241203 IP
anydnsmby.52261 > f.root-servers.net.domain: 3841 [1au] NS? .
(28)15:36:43.624041 IP anydnsmby.48889 > k.root-servers.net.domain: 6314 [1au]
NS? . (28)15:36:44.424047 IP anydnsmby.65507 > c.root-servers.net.domain:
27973 [1au] NS? . (28)15:37:42.071574 IP anydnsmby.38958 >
i.root-servers.net.domain: 53519 [1au] NS? 117.240.177.150.
(44)15:40:11.121122 IP anydnsmby.7941 > i.root-servers.net.domain: 62400 [1au]
NS? 1.mr. (33)15:45:52.780062 IP anydnsmby.49432 > e.root-servers.net.domain:
54241+ [1au] NS? . (28)15:45:59.341780 IP anydnsmby.34368 >
e.root-servers.net.domain: 55928+ [1au] NS? . (28)15:46:04.487088 IP
anydnsmby.35621 > e.root-servers.net.domain: 7266+ [1au] NS? .
(28)15:46:35.453029 IP anydnsmby.62875 > i.root-servers.net.domain: 4129 [1au]
NS? comp-HP. (36)16:16:13.747955 IP anydnsmby.39690 >
a.root-servers.net.domain: 8774+ [1au] NS? . (28)16:16:20.845363 IP
anydnsmby.36994 > e.root-servers.net.domain: 63433+ [1au] NS? .
(28)16:16:36.746049 IP anydnsmby.42878 > a.root-servers.net.domain: 48439+
[1au] NS? . (28)16:16:42.060534 IP anydnsmby.41018 > j.root-servers.net.domain:
5347+ [1au] NS? . (28)16:16:49.081649 IP anydnsmby.53661 >
e.root-servers.net.domain: 54768+ [1au] NS? . (28)16:51:14.034065 IP
anydnsmby.38025 > k.root-servers.net.domain: 52771 [1au] NS? 116.73.202.141.
(43)16:51:14.835539 IP anydnsmby.19616 > i.root-servers.net.domain: 14926
[1au] NS? 116.73.202.141. (43)17:25:16.706395 IP anydnsmby.58045 >
i.root-servers.net.domain: 30880 [1au] NS? 2.mr. (33)17:25:16.707072 IP
anydnsmby.38495 > i.root-servers.net.domain: 43451 [1au] NS? 6.mr.
(33)17:25:16.707989 IP anydnsmby.35834 > i.root-servers.net.domain: 61843
[1au] NS? 3.mr. (33)17:56:44.855060 IP anydnsmby.61903 >
a.root-servers.net.domain: 23284 [1au] NS? 172.192.168.2. (42) Regards,Gaurav
Kansal
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