dns query process

[jittinan suwanrueangsri]

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Hi all

This is result of tracing www.google.com by dig 9.5.0

; <<>> DiG 9.5.0-P1 <<>> +trace www.google.com
;; global options: printcmd
. 9398 IN NS E.ROOT-SERVERS.NET.
. 9398 IN NS G.ROOT-SERVERS.NET.
. 9398 IN NS K.ROOT-SERVERS.NET.
. 9398 IN NS L.ROOT-SERVERS.NET.
. 9398 IN NS A.ROOT-SERVERS.NET.
. 9398 IN NS J.ROOT-SERVERS.NET.
. 9398 IN NS B.ROOT-SERVERS.NET.
. 9398 IN NS I.ROOT-SERVERS.NET.
. 9398 IN NS D.ROOT-SERVERS.NET.
. 9398 IN NS F.ROOT-SERVERS.NET.
. 9398 IN NS M.ROOT-SERVERS.NET.
. 9398 IN NS C.ROOT-SERVERS.NET.
. 9398 IN NS H.ROOT-SERVERS.NET.
;; Received 272 bytes from 10.10.10.101#53(10.10.10.101) in 0 ms
com. 172800 IN NS a.gtld-servers.net.
com. 172800 IN NS b.gtld-servers.net.
com. 172800 IN NS c.gtld-servers.net.
com. 172800 IN NS d.gtld-servers.net.
com. 172800 IN NS e.gtld-servers.net.
com. 172800 IN NS f.gtld-servers.net.
com. 172800 IN NS g.gtld-servers.net.
com. 172800 IN NS h.gtld-servers.net.
com. 172800 IN NS i.gtld-servers.net.
com. 172800 IN NS j.gtld-servers.net.
com. 172800 IN NS k.gtld-servers.net.
com. 172800 IN NS l.gtld-servers.net.
com. 172800 IN NS m.gtld-servers.net.
;; Received 492 bytes from 199.7.83.42#53(L.ROOT-SERVERS.NET) in 273 ms
google.com. 172800 IN NS ns1.google.com.
google.com. 172800 IN NS ns2.google.com.
google.com. 172800 IN NS ns3.google.com.
google.com. 172800 IN NS ns4.google.com.
;; Received 168 bytes from 192.41.162.30#53(l.gtld-servers.net) in 296 ms
www.google.com. 604800 IN CNAME www.l.google.com.
l.google.com. 86400 IN NS c.l.google.com.
l.google.com. 86400 IN NS b.l.google.com.
l.google.com. 86400 IN NS a.l.google.com.
l.google.com. 86400 IN NS g.l.google.com.
l.google.com. 86400 IN NS e.l.google.com.
l.google.com. 86400 IN NS d.l.google.com.
l.google.com. 86400 IN NS f.l.google.com.
;; Received 276 bytes from 216.239.34.10#53(ns2.google.com) in 349 ms

Here is result of querying ns record from ns1.google.com

> google.com
Server: [216.239.32.10]
Address: 216.239.32.10
------------
Got answer:
HEADER:
opcode = QUERY, id = 6, rcode = NOERROR
header flags: response, auth. answer, want recursion
questions = 1, answers = 4, authority records = 0, additional = 4
QUESTIONS:
google.com, type = NS, class = IN
ANSWERS:
-> google.com
nameserver = ns2.google.com
ttl = 345600 (4 days)
-> google.com
nameserver = ns3.google.com
ttl = 345600 (4 days)
-> google.com
nameserver = ns1.google.com
ttl = 345600 (4 days)
-> google.com
nameserver = ns4.google.com
ttl = 345600 (4 days)
ADDITIONAL RECORDS:
-> ns1.google.com
internet address = 216.239.32.10
ttl = 345600 (4 days)
-> ns2.google.com
internet address = 216.239.34.10
ttl = 345600 (4 days)
-> ns3.google.com
internet address = 216.239.36.10
ttl = 345600 (4 days)
-> ns4.google.com
internet address = 216.239.38.10
ttl = 345600 (4 days)
------------
google.com
nameserver = ns2.google.com
ttl = 345600 (4 days)
google.com
nameserver = ns3.google.com
ttl = 345600 (4 days)
google.com
nameserver = ns1.google.com
ttl = 345600 (4 days)
google.com
nameserver = ns4.google.com
ttl = 345600 (4 days)
ns1.google.com
internet address = 216.239.32.10
ttl = 345600 (4 days)
ns2.google.com
internet address = 216.239.34.10
ttl = 345600 (4 days)
ns3.google.com
internet address = 216.239.36.10
ttl = 345600 (4 days)
ns4.google.com
internet address = 216.239.38.10
ttl = 345600 (4 days)
>

As shown above ,the first result from dig show that ns1.google.com record in
com. has ttl= 172800 but the second result from querying one of
google.comzone authorize which in is case is
ns1.google.com show that ttl=345600.

If one day google.com remove ns1.google.com from com. or any changing to
ns1.google.com. How fast do other domain 's caching dns know these changing?
172800 or 345600 ?

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<div>Hi all</div>
<div>&nbsp;</div>
<div>This is result of tracing <a href=3D"http://www.google.com/">www.googl=
e.com</a>&nbsp;by dig 9.5.0</div>
<div>&nbsp;</div>
<div>; &lt;&lt;&gt;&gt; DiG 9.5.0-P1 &lt;&lt;&gt;&gt; +trace <a href=3D"htt=
p://www.google.com/">www.google.com</a><br>;; global options:&nbsp; printcm=
d<br>.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 9398&nbsp;&=
nbsp;&nbsp; IN&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; NS&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p; <a href=3D"http://E.ROOT-SERVERS.NET">E.ROOT-SERVERS.NET</a>.<br>
.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 9398&nbsp;&nbsp;=
&nbsp; IN&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; NS&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <a=
href=3D"http://G.ROOT-SERVERS.NET">G.ROOT-SERVERS.NET</a>.<br>.&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 9398&nbsp;&nbsp;&nbsp; IN&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp; NS&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <a href=3D"htt=
p://K.ROOT-SERVERS.NET">K.ROOT-SERVERS.NET</a>.<br>
.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 9398&nbsp;&nbsp;=
&nbsp; IN&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; NS&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <a=
href=3D"http://L.ROOT-SERVERS.NET">L.ROOT-SERVERS.NET</a>.<br>.&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 9398&nbsp;&nbsp;&nbsp; IN&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp; NS&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <a href=3D"htt=
p://A.ROOT-SERVERS.NET">A.ROOT-SERVERS.NET</a>.<br>
.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 9398&nbsp;&nbsp;=
&nbsp; IN&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; NS&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <a=
href=3D"http://J.ROOT-SERVERS.NET">J.ROOT-SERVERS.NET</a>.<br>.&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 9398&nbsp;&nbsp;&nbsp; IN&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp; NS&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <a href=3D"htt=
p://B.ROOT-SERVERS.NET">B.ROOT-SERVERS.NET</a>.<br>
.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 9398&nbsp;&nbsp;=
&nbsp; IN&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; NS&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <a=
href=3D"http://I.ROOT-SERVERS.NET">I.ROOT-SERVERS.NET</a>.<br>.&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 9398&nbsp;&nbsp;&nbsp; IN&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp; NS&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <a href=3D"htt=
p://D.ROOT-SERVERS.NET">D.ROOT-SERVERS.NET</a>.<br>
.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 9398&nbsp;&nbsp;=
&nbsp; IN&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; NS&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <a=
href=3D"http://F.ROOT-SERVERS.NET">F.ROOT-SERVERS.NET</a>.<br>.&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 9398&nbsp;&nbsp;&nbsp; IN&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp; NS&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <a href=3D"htt=
p://M.ROOT-SERVERS.NET">M.ROOT-SERVERS.NET</a>.<br>
.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 9398&nbsp;&nbsp;=
&nbsp; IN&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; NS&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <a=
href=3D"http://C.ROOT-SERVERS.NET">C.ROOT-SERVERS.NET</a>.<br>.&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 9398&nbsp;&nbsp;&nbsp; IN&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp; NS&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <a href=3D"htt=
p://H.ROOT-SERVERS.NET">H.ROOT-SERVERS.NET</a>.<br>
;; Received 272 bytes from 10.10.10.101#53(10.10.10.101) in 0 ms</div>
<div>com.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 172800&nbsp; IN&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp; NS&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <a href=3D"http://a.gt=
ld-servers.net">a.gtld-servers.net</a>.<br>com.&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp; 172800&nbsp; IN&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; NS&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp; <a href=3D"http://b.gtld-servers.net">b.gtld-servers.net</a=
>.<br>
com.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 172800&nbsp; IN&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp; NS&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <a href=3D"http://c.gtld-se=
rvers.net">c.gtld-servers.net</a>.<br>com.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp; 172800&nbsp; IN&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; NS&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp; <a href=3D"http://d.gtld-servers.net">d.gtld-servers.net</a>.<br=
>
com.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 172800&nbsp; IN&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp; NS&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <a href=3D"http://e.gtld-se=
rvers.net">e.gtld-servers.net</a>.<br>com.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp; 172800&nbsp; IN&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; NS&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp; <a href=3D"http://f.gtld-servers.net">f.gtld-servers.net</a>.<br=
>
com.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 172800&nbsp; IN&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp; NS&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <a href=3D"http://g.gtld-se=
rvers.net">g.gtld-servers.net</a>.<br>com.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp; 172800&nbsp; IN&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; NS&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp; <a href=3D"http://h.gtld-servers.net">h.gtld-servers.net</a>.<br=
>
com.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 172800&nbsp; IN&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp; NS&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <a href=3D"http://i.gtld-se=
rvers.net">i.gtld-servers.net</a>.<br>com.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp; 172800&nbsp; IN&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; NS&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp; <a href=3D"http://j.gtld-servers.net">j.gtld-servers.net</a>.<br=
>
com.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 172800&nbsp; IN&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp; NS&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <a href=3D"http://k.gtld-se=
rvers.net">k.gtld-servers.net</a>.<br>com.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp; 172800&nbsp; IN&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; NS&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp; <a href=3D"http://l.gtld-servers.net">l.gtld-servers.net</a>.<br=
>
com.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 172800&nbsp; IN&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp; NS&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <a href=3D"http://m.gtld-se=
rvers.net">m.gtld-servers.net</a>.<br>;; Received 492 bytes from 199.7.83.4=
2#53(<a href=3D"http://L.ROOT-SERVERS.NET">L.ROOT-SERVERS.NET</a>) in 273 m=
s</div>

<div><font color=3D"#ff0000"><a href=3D"http://google.com">google.com</a>.&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 172=
800&nbsp; IN&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; NS&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
<a href=3D"http://ns1.google.com">ns1.google.com</a>.<br></font><a href=3D=
"http://google.com">google.com</a>.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 172800&nbsp; IN&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp; NS&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <a href=3D"http://ns2.google.com">ns2.=
google.com</a>.<br>
<a href=3D"http://google.com">google.com</a>.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 172800&nbsp; IN&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp; NS&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <a href=3D"http://ns3.google=
.com">ns3.google.com</a>.<br><a href=3D"http://google.com">google.com</a>.&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 172=
800&nbsp; IN&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; NS&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
<a href=3D"http://ns4.google.com">ns4.google.com</a>.<br>
;; Received 168 bytes from 192.41.162.30#53(<a href=3D"http://l.gtld-server=
s.net">l.gtld-servers.net</a>) in 296 ms</div>
<div><a href=3D"http://www.google.com/">www.google.com</a>.&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 604800&nbsp; IN&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp; CNAME&nbsp;&nbsp; <a href=3D"http://www.l.google.com/">www.l.google.com=
</a>.<br><a href=3D"http://l.google.com">l.google.com</a>.&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 86400&nbsp;&nbsp; IN&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp; NS&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <a href=3D"http://c.l.=
google.com">c.l.google.com</a>.<br>
<a href=3D"http://l.google.com">l.google.com</a>.&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 86400&nbsp;&nbsp; IN&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp; NS&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <a href=3D"http://b.l.google.co=
m">b.l.google.com</a>.<br><a href=3D"http://l.google.com">l.google.com</a>.=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 86400&nbsp;&nb=
sp; IN&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; NS&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <a hr=
ef=3D"http://a.l.google.com">a.l.google.com</a>.<br>
<a href=3D"http://l.google.com">l.google.com</a>.&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 86400&nbsp;&nbsp; IN&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp; NS&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <a href=3D"http://g.l.google.co=
m">g.l.google.com</a>.<br><a href=3D"http://l.google.com">l.google.com</a>.=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 86400&nbsp;&nb=
sp; IN&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; NS&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <a hr=
ef=3D"http://e.l.google.com">e.l.google.com</a>.<br>
<a href=3D"http://l.google.com">l.google.com</a>.&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 86400&nbsp;&nbsp; IN&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp; NS&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <a href=3D"http://d.l.google.co=
m">d.l.google.com</a>.<br><a href=3D"http://l.google.com">l.google.com</a>.=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 86400&nbsp;&nb=
sp; IN&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; NS&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <a hr=
ef=3D"http://f.l.google.com">f.l.google.com</a>.<br>
;; Received 276 bytes from 216.239.34.10#53(<a href=3D"http://ns2.google.co=
m">ns2.google.com</a>) in 349 ms</div>
<div>&nbsp;</div>
<div>Here is result of querying ns record from <a href=3D"http://ns1.google=
.com">ns1.google.com</a></div>
<div>&nbsp;</div>
<div>&nbsp;</div>
<div>&gt; <a href=3D"http://google.com">google.com</a><br>Server:&nbsp; [21=
6.239.32.10]<br>Address:&nbsp; 216.239.32.10</div>
<div>------------<br>Got answer:<br>&nbsp;&nbsp;&nbsp; HEADER:<br>&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; opcode =3D QUERY, id =3D 6, rcode =3D NOE=
RROR<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; header flags:&nbsp; resp=
onse, auth. answer, want recursion<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp; questions =3D 1,&nbsp; answers =3D 4,&nbsp; authority records =3D 0,&=
nbsp; additional =3D 4</div>

<div>&nbsp;&nbsp;&nbsp; QUESTIONS:<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp; <a href=3D"http://google.com">google.com</a>, type =3D NS, class =3D =
IN<br>&nbsp;&nbsp;&nbsp; ANSWERS:<br>&nbsp;&nbsp;&nbsp; -&gt;&nbsp; <a href=
=3D"http://google.com">google.com</a><br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp; nameserver =3D <a href=3D"http://ns2.google.com">ns2.google.com</a=
><br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; ttl =3D 345600 (4 days)<br>&nbsp=
;&nbsp;&nbsp; -&gt;&nbsp; <a href=3D"http://google.com">google.com</a><br>&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; nameserver =3D <a href=3D"http://=
ns3.google.com">ns3.google.com</a><br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp; ttl =3D 345600 (4 days)<br>&nbsp;&nbsp;&nbsp;<font color=3D"#cc0000">=
</font><font color=3D"#ff0000">-&gt;&nbsp; <a href=3D"http://google.com">g=
oogle.com</a><br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; nameserver =3D <a href=3D"http:/=
/ns1.google.com">ns1.google.com</a><br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp; ttl =3D 345600 (4 days)<br></font>&nbsp;&nbsp;&nbsp; -&gt;&nbsp; <a =
href=3D"http://google.com">google.com</a><br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp; nameserver =3D <a href=3D"http://ns4.google.com">ns4.google.co=
m</a><br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; ttl =3D 345600 (4 days)<br>&nbsp=
;&nbsp;&nbsp; ADDITIONAL RECORDS:<br>&nbsp;&nbsp;&nbsp; -&gt;&nbsp; <a href=
=3D"http://ns1.google.com">ns1.google.com</a><br>&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp; internet address =3D 216.239.32.10<br>&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp; ttl =3D 345600 (4 days)<br>&nbsp;&nbsp;&nbsp; -&gt;&=
nbsp; <a href=3D"http://ns2.google.com">ns2.google.com</a><br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; internet address =3D 216.239.34.=
10<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; ttl =3D 345600 (4 days)<br=
>&nbsp;&nbsp;&nbsp; -&gt;&nbsp; <a href=3D"http://ns3.google.com">ns3.googl=
e.com</a><br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; internet address =
=3D 216.239.36.10<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; ttl =3D 345=
600 (4 days)<br>&nbsp;&nbsp;&nbsp; -&gt;&nbsp; <a href=3D"http://ns4.google=
.com">ns4.google.com</a><br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; internet address =3D 216.239.38.=
10<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; ttl =3D 345600 (4 days)</d=
iv>
<div>------------<br><a href=3D"http://google.com">google.com</a><br>&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; nameserver =3D <a href=3D"http://ns2.g=
oogle.com">ns2.google.com</a><br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
ttl =3D 345600 (4 days)<br><a href=3D"http://google.com">google.com</a><br=
>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; nameserver =3D <a href=3D"http:/=
/ns3.google.com">ns3.google.com</a><br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp; ttl =3D 345600 (4 days)<br><a href=3D"http://google.com">google.com<=
/a><br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; nameserver =3D <a href=3D=
"http://ns1.google.com">ns1.google.com</a><br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; ttl =3D 345600 (4 days)<br><a hr=
ef=3D"http://google.com">google.com</a><br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp; nameserver =3D <a href=3D"http://ns4.google.com">ns4.google.com<=
/a><br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; ttl =3D 345600 (4 days)<b=
r><a href=3D"http://ns1.google.com">ns1.google.com</a><br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; internet address =3D 216.239.32.=
10<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; ttl =3D 345600 (4 days)<br=
><a href=3D"http://ns2.google.com">ns2.google.com</a><br>&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp; internet address =3D 216.239.34.10<br>&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; ttl =3D 345600 (4 days)<br><a href=3D"http:/=
/ns3.google.com">ns3.google.com</a><br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; internet address =3D 216.239.36.=
10<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; ttl =3D 345600 (4 days)<br=
><a href=3D"http://ns4.google.com">ns4.google.com</a><br>&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp; internet address =3D 216.239.38.10<br>&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; ttl =3D 345600 (4 days)<br>&gt;</div>
<div>&nbsp;</div>
<div>&nbsp;</div>
<div>As shown above ,the first result from dig show that&nbsp;<a href=3D"ht=
tp://ns1.google.com">ns1.google.com</a> record in com. has ttl=3D&nbsp;<fon=
t color=3D"#000000">172800 but the second result from querying one of <a hr=
ef=3D"http://google.com">google.com</a> zone authorize which in is case is =
<a href=3D"http://ns1.google.com">ns1.google.com</a> show that ttl=3D345600=
.</font></div>

<div>&nbsp;</div>
<div>If one day <a href=3D"http://google.com">google.com</a> remove <a href=
=3D"http://ns1.google.com">ns1.google.com</a> from com. or any changing&nbs=
p;to <a href=3D"http://ns1.google.com">ns1.google.com</a>. How fast do othe=
r domain &#39;s caching dns know these changing? 172800 or 345600 ?&nbsp;&n=
bsp;</div>

<div>&nbsp;</div>

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_______________________________________________
bind-users mailing list
bind-...@lists.isc.org
https://lists.isc.org/mailman/listinfo/bind-users
--===============7014283935302777439==--

[Robert Stucke]

--===============8822041084686131152==
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Since they may have cached the NS records at any time, it's just a maximum
of 345600. Once a device follows the delegation from the .com authority and
queries ns1.google.com directly, the NS records in the cache that were
learned from the .com level servers are overwritten with what was learned
from ns1.google.com. The NS records from the TLD authority typically only
exist within a cache for a brief period until overwritten by first query
response from the actual authority.

> google.com zone authorize which in is case is ns1.google.com show that

> ttl=345600.
>
> If one day google.com remove ns1.google.com from com. or any changing to
> ns1.google.com. How fast do other domain 's caching dns know these
> changing? 172800 or 345600 ?
>
>

> _______________________________________________
> bind-users mailing list
> bind-...@lists.isc.org
> https://lists.isc.org/mailman/listinfo/bind-users
>

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Since they may have cached the NS records at any time, it&#39;s just a
maximum of 345600. Once a device follows the delegation from the .com
authority and queries <a href=3D"http://ns1.google.com/" target=3D"_blank">=
ns1.google.com</a>
directly, the NS records in the cache that were learned from the .com
level servers are overwritten with what was learned from <a href=3D"http://=
ns1.google.com/" target=3D"_blank">ns1.google.com</a>.
The NS records from the TLD authority typically only exist within a
cache for a brief period until overwritten by first query response from the=
actual authority.<br><br><br><div class=3D"gmail_quote">On Fri, Jan 16, 20=
09 at 10:56 AM, jittinan suwanrueangsri <span dir=3D"ltr">&lt;<a href=3D"ma=
ilto:jitt...@gmail.com">jitt...@gmail.com</a>&gt;</span> wrote:<br>
<blockquote class=3D"gmail_quote" style=3D"border-left: 1px solid rgb(204, =
204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;"><div>Hi all</div>
<div>&nbsp;</div>
<div>This is result of tracing <a href=3D"http://www.google.com/" target=3D=
"_blank">www.google.com</a>&nbsp;by dig 9.5.0</div>

<div>&nbsp;</div>
<div>; &lt;&lt;&gt;&gt; DiG 9.5.0-P1 &lt;&lt;&gt;&gt; +trace <a href=3D"htt=

p://www.google.com/" target=3D"_blank">www.google.com</a><br>;; global opti=
ons:&nbsp; printcmd<br>.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=

sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=

&nbsp; 9398&nbsp;&nbsp;&nbsp; IN&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; NS&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp; <a href=3D"http://E.ROOT-SERVERS.NET" target=3D"_blank=
">E.ROOT-SERVERS.NET</a>.<br>

.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 9398&nbsp;&nbsp;=
&nbsp; IN&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; NS&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <a=

href=3D"http://G.ROOT-SERVERS.NET" target=3D"_blank">G.ROOT-SERVERS.NET</a=
>.<br>.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 9398&nbsp;=
&nbsp;&nbsp; IN&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; NS&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp; <a href=3D"http://K.ROOT-SERVERS.NET" target=3D"_blank">K.ROOT-SERVERS.=
NET</a>.<br>

.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 9398&nbsp;&nbsp;=
&nbsp; IN&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; NS&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <a=

href=3D"http://L.ROOT-SERVERS.NET" target=3D"_blank">L.ROOT-SERVERS.NET</a=
>.<br>.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 9398&nbsp;=
&nbsp;&nbsp; IN&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; NS&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp; <a href=3D"http://A.ROOT-SERVERS.NET" target=3D"_blank">A.ROOT-SERVERS.=
NET</a>.<br>

.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 9398&nbsp;&nbsp;=
&nbsp; IN&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; NS&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <a=

href=3D"http://J.ROOT-SERVERS.NET" target=3D"_blank">J.ROOT-SERVERS.NET</a=
>.<br>.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 9398&nbsp;=
&nbsp;&nbsp; IN&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; NS&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp; <a href=3D"http://B.ROOT-SERVERS.NET" target=3D"_blank">B.ROOT-SERVERS.=
NET</a>.<br>

.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 9398&nbsp;&nbsp;=
&nbsp; IN&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; NS&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <a=

href=3D"http://I.ROOT-SERVERS.NET" target=3D"_blank">I.ROOT-SERVERS.NET</a=
>.<br>.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 9398&nbsp;=
&nbsp;&nbsp; IN&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; NS&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp; <a href=3D"http://D.ROOT-SERVERS.NET" target=3D"_blank">D.ROOT-SERVERS.=
NET</a>.<br>

.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 9398&nbsp;&nbsp;=
&nbsp; IN&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; NS&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <a=

href=3D"http://F.ROOT-SERVERS.NET" target=3D"_blank">F.ROOT-SERVERS.NET</a=
>.<br>.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 9398&nbsp;=
&nbsp;&nbsp; IN&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; NS&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp; <a href=3D"http://M.ROOT-SERVERS.NET" target=3D"_blank">M.ROOT-SERVERS.=
NET</a>.<br>

.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 9398&nbsp;&nbsp;=
&nbsp; IN&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; NS&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <a=

href=3D"http://C.ROOT-SERVERS.NET" target=3D"_blank">C.ROOT-SERVERS.NET</a=
>.<br>.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 9398&nbsp;=
&nbsp;&nbsp; IN&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; NS&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp; <a href=3D"http://H.ROOT-SERVERS.NET" target=3D"_blank">H.ROOT-SERVERS.=
NET</a>.<br>

;; Received 272 bytes from 10.10.10.101#53(10.10.10.101) in 0 ms</div>
<div>com.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 172800&nbsp; IN&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp; NS&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <a href=3D"http://a.gt=

ld-servers.net" target=3D"_blank">a.gtld-servers.net</a>.<br>com.&nbsp;&nbs=

p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=

nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 172800&nbsp; IN&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
NS&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <a href=3D"http://b.gtld-servers.net" tar=
get=3D"_blank">b.gtld-servers.net</a>.<br>

com.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 172800&nbsp; IN&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp; NS&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <a href=3D"http://c.gtld-se=

rvers.net" target=3D"_blank">c.gtld-servers.net</a>.<br>com.&nbsp;&nbsp;&nb=

sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=

&nbsp;&nbsp;&nbsp;&nbsp; 172800&nbsp; IN&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; NS&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp; <a href=3D"http://d.gtld-servers.net" target=
=3D"_blank">d.gtld-servers.net</a>.<br>

com.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 172800&nbsp; IN&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp; NS&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <a href=3D"http://e.gtld-se=

rvers.net" target=3D"_blank">e.gtld-servers.net</a>.<br>com.&nbsp;&nbsp;&nb=

sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=

&nbsp;&nbsp;&nbsp;&nbsp; 172800&nbsp; IN&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; NS&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp; <a href=3D"http://f.gtld-servers.net" target=
=3D"_blank">f.gtld-servers.net</a>.<br>

com.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 172800&nbsp; IN&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp; NS&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <a href=3D"http://g.gtld-se=

rvers.net" target=3D"_blank">g.gtld-servers.net</a>.<br>com.&nbsp;&nbsp;&nb=

sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=

&nbsp;&nbsp;&nbsp;&nbsp; 172800&nbsp; IN&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; NS&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp; <a href=3D"http://h.gtld-servers.net" target=
=3D"_blank">h.gtld-servers.net</a>.<br>

com.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 172800&nbsp; IN&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp; NS&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <a href=3D"http://i.gtld-se=

rvers.net" target=3D"_blank">i.gtld-servers.net</a>.<br>com.&nbsp;&nbsp;&nb=

sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=

&nbsp;&nbsp;&nbsp;&nbsp; 172800&nbsp; IN&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; NS&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp; <a href=3D"http://j.gtld-servers.net" target=
=3D"_blank">j.gtld-servers.net</a>.<br>

com.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 172800&nbsp; IN&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp; NS&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <a href=3D"http://k.gtld-se=

rvers.net" target=3D"_blank">k.gtld-servers.net</a>.<br>com.&nbsp;&nbsp;&nb=

sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=

&nbsp;&nbsp;&nbsp;&nbsp; 172800&nbsp; IN&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; NS&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp; <a href=3D"http://l.gtld-servers.net" target=
=3D"_blank">l.gtld-servers.net</a>.<br>

com.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 172800&nbsp; IN&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp; NS&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <a href=3D"http://m.gtld-se=

rvers.net" target=3D"_blank">m.gtld-servers.net</a>.<br>;; Received 492 byt=
es from 199.7.83.42#53(<a href=3D"http://L.ROOT-SERVERS.NET" target=3D"_bla=
nk">L.ROOT-SERVERS.NET</a>) in 273 ms</div>

<div><font color=3D"#ff0000"><a href=3D"http://google.com" target=3D"_blank=
">google.com</a>.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp; 172800&nbsp; IN&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; NS&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp; <a href=3D"http://ns1.google.com" target=3D"_blank">ns1.=
google.com</a>.<br></font><a href=3D"http://google.com" target=3D"_blank">g=
oogle.com</a>.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=

nbsp;&nbsp; 172800&nbsp; IN&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; NS&nbsp;&nbsp;&nb=

sp;&nbsp;&nbsp; <a href=3D"http://ns2.google.com" target=3D"_blank">ns2.goo=
gle.com</a>.<br>

<a href=3D"http://google.com" target=3D"_blank">google.com</a>.&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 172800&nbsp; I=
N&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; NS&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <a href=3D=
"http://ns3.google.com" target=3D"_blank">ns3.google.com</a>.<br><a href=3D=
"http://google.com" target=3D"_blank">google.com</a>.&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 172800&nbsp; IN&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp; NS&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <a href=3D"http://ns=
4.google.com" target=3D"_blank">ns4.google.com</a>.<br>

;; Received 168 bytes from 192.41.162.30#53(<a href=3D"http://l.gtld-server=

s.net" target=3D"_blank">l.gtld-servers.net</a>) in 296 ms</div>
<div><a href=3D"http://www.google.com/" target=3D"_blank">www.google.com</a=
>.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 604800&nbsp; IN&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp; CNAME&nbsp;&nbsp; <a href=3D"http://www.l.google.com/=
" target=3D"_blank">www.l.google.com</a>.<br><a href=3D"http://l.google.com=
" target=3D"_blank">l.google.com</a>.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp; 86400&nbsp;&nbsp; IN&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; N=
S&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <a href=3D"http://c.l.google.com" target=3D=
"_blank">c.l.google.com</a>.<br>

<a href=3D"http://l.google.com" target=3D"_blank">l.google.com</a>.&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 86400&nbsp;&nbsp; IN&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp; NS&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <a href=3D"ht=
tp://b.l.google.com" target=3D"_blank">b.l.google.com</a>.<br><a href=3D"ht=
tp://l.google.com" target=3D"_blank">l.google.com</a>.&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 86400&nbsp;&nbsp; IN&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp; NS&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <a href=3D"http://a.l.goog=
le.com" target=3D"_blank">a.l.google.com</a>.<br>

<a href=3D"http://l.google.com" target=3D"_blank">l.google.com</a>.&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 86400&nbsp;&nbsp; IN&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp; NS&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <a href=3D"ht=
tp://g.l.google.com" target=3D"_blank">g.l.google.com</a>.<br><a href=3D"ht=
tp://l.google.com" target=3D"_blank">l.google.com</a>.&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 86400&nbsp;&nbsp; IN&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp; NS&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <a href=3D"http://e.l.goog=
le.com" target=3D"_blank">e.l.google.com</a>.<br>

<a href=3D"http://l.google.com" target=3D"_blank">l.google.com</a>.&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 86400&nbsp;&nbsp; IN&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp; NS&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <a href=3D"ht=
tp://d.l.google.com" target=3D"_blank">d.l.google.com</a>.<br><a href=3D"ht=
tp://l.google.com" target=3D"_blank">l.google.com</a>.&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 86400&nbsp;&nbsp; IN&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp; NS&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <a href=3D"http://f.l.goog=
le.com" target=3D"_blank">f.l.google.com</a>.<br>

;; Received 276 bytes from 216.239.34.10#53(<a href=3D"http://ns2.google.co=

m" target=3D"_blank">ns2.google.com</a>) in 349 ms</div>

<div>&nbsp;</div>
<div>Here is result of querying ns record from <a href=3D"http://ns1.google=

.com" target=3D"_blank">ns1.google.com</a></div>

<div>&nbsp;</div>
<div>&nbsp;</div>

<div>&gt; <a href=3D"http://google.com" target=3D"_blank">google.com</a><br=
>Server:&nbsp; [216.239.32.10]<br>Address:&nbsp; 216.239.32.10</div>

<div>------------<br>Got answer:<br>&nbsp;&nbsp;&nbsp; HEADER:<br>&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; opcode =3D QUERY, id =3D 6, rcode =3D NOE=
RROR<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; header flags:&nbsp; resp=
onse, auth. answer, want recursion<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp; questions =3D 1,&nbsp; answers =3D 4,&nbsp; authority records =3D 0,&=
nbsp; additional =3D 4</div>

<div>&nbsp;&nbsp;&nbsp; QUESTIONS:<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=

nbsp; <a href=3D"http://google.com" target=3D"_blank">google.com</a>, type =
=3D NS, class =3D IN<br>&nbsp;&nbsp;&nbsp; ANSWERS:<br>&nbsp;&nbsp;&nbsp; -=
&gt;&nbsp; <a href=3D"http://google.com" target=3D"_blank">google.com</a><b=
r>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; nameserver =3D <a href=3D"http=
://ns2.google.com" target=3D"_blank">ns2.google.com</a><br>

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; ttl =3D 345600 (4 days)<br>&nbsp=

;&nbsp;&nbsp; -&gt;&nbsp; <a href=3D"http://google.com" target=3D"_blank">g=
oogle.com</a><br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; nameserver =3D =
<a href=3D"http://ns3.google.com" target=3D"_blank">ns3.google.com</a><br>&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; ttl =3D 345600 (4 days)<br>
&nbsp;&nbsp;&nbsp;<font color=3D"#cc0000"> </font><font color=3D"#ff0000">-=
&gt;&nbsp; <a href=3D"http://google.com" target=3D"_blank">google.com</a><b=

r>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; nameserver =3D <a href=3D"http:/=

/ns1.google.com" target=3D"_blank">ns1.google.com</a><br>&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp; ttl =3D 345600 (4 days)<br></font>&nbsp;&nbsp;&nbs=
p; -&gt;&nbsp; <a href=3D"http://google.com" target=3D"_blank">google.com</=
a><br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; nameserver =3D <a href=3D"=
http://ns4.google.com" target=3D"_blank">ns4.google.com</a><br>

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; ttl =3D 345600 (4 days)<br>&nbsp=
;&nbsp;&nbsp; ADDITIONAL RECORDS:<br>&nbsp;&nbsp;&nbsp; -&gt;&nbsp; <a href=

=3D"http://ns1.google.com" target=3D"_blank">ns1.google.com</a><br>&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; internet address =3D 216.239.32.10<br>&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; ttl =3D 345600 (4 days)<br>&nbsp;&=
nbsp;&nbsp; -&gt;&nbsp; <a href=3D"http://ns2.google.com" target=3D"_blank"=
>ns2.google.com</a><br>

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; internet address =3D 216.239.34.=
10<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; ttl =3D 345600 (4 days)<br=

>&nbsp;&nbsp;&nbsp; -&gt;&nbsp; <a href=3D"http://ns3.google.com" target=3D=
"_blank">ns3.google.com</a><br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; i=
nternet address =3D 216.239.36.10<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=

bsp; ttl =3D 345600 (4 days)<br>

&nbsp;&nbsp;&nbsp; -&gt;&nbsp; <a href=3D"http://ns4.google.com" target=3D"=
_blank">ns4.google.com</a><br>

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; internet address =3D 216.239.38.=
10<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; ttl =3D 345600 (4 days)</d=
iv>

<div>------------<br><a href=3D"http://google.com" target=3D"_blank">google=
.com</a><br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; nameserver =3D <a hr=
ef=3D"http://ns2.google.com" target=3D"_blank">ns2.google.com</a><br>&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; ttl =3D 345600 (4 days)<br><a href=3D"=
http://google.com" target=3D"_blank">google.com</a><br>

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; nameserver =3D <a href=3D"http:/=

/ns3.google.com" target=3D"_blank">ns3.google.com</a><br>&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp; ttl =3D 345600 (4 days)<br><a href=3D"http://googl=
e.com" target=3D"_blank">google.com</a><br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp; nameserver =3D <a href=3D"http://ns1.google.com" target=3D"_blan=
k">ns1.google.com</a><br>

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; ttl =3D 345600 (4 days)<br><a hr=

ef=3D"http://google.com" target=3D"_blank">google.com</a><br>&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp; nameserver =3D <a href=3D"http://ns4.google.co=
m" target=3D"_blank">ns4.google.com</a><br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp; ttl =3D 345600 (4 days)<br><a href=3D"http://ns1.google.com" tar=
get=3D"_blank">ns1.google.com</a><br>

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; internet address =3D 216.239.32.=
10<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; ttl =3D 345600 (4 days)<br=

><a href=3D"http://ns2.google.com" target=3D"_blank">ns2.google.com</a><br>=

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; internet address =3D 216.239.34.=
10<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; ttl =3D 345600 (4 days)<br=
>

<a href=3D"http://ns3.google.com" target=3D"_blank">ns3.google.com</a><br>

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; internet address =3D 216.239.36.=
10<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; ttl =3D 345600 (4 days)<br=

><a href=3D"http://ns4.google.com" target=3D"_blank">ns4.google.com</a><br>=

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; internet address =3D 216.239.38.=

10<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; ttl =3D 345600 (4 days)<br=

>
&gt;</div>
<div>&nbsp;</div>
<div>&nbsp;</div>
<div>As shown above ,the first result from dig show that&nbsp;<a href=3D"ht=

tp://ns1.google.com" target=3D"_blank">ns1.google.com</a> record in com. ha=
s ttl=3D&nbsp;<font color=3D"#000000">172800 but the second result from que=
rying one of <a href=3D"http://google.com" target=3D"_blank">google.com</a>=
zone authorize which in is case is <a href=3D"http://ns1.google.com" targe=
t=3D"_blank">ns1.google.com</a> show that ttl=3D345600.</font></div>

<div>&nbsp;</div>
<div>If one day <a href=3D"http://google.com" target=3D"_blank">google.com<=
/a> remove <a href=3D"http://ns1.google.com" target=3D"_blank">ns1.google.c=
om</a> from com. or any changing&nbsp;to <a href=3D"http://ns1.google.com" =
target=3D"_blank">ns1.google.com</a>. How fast do other domain &#39;s cachi=
ng dns know these changing? 172800 or 345600 ?&nbsp;&nbsp;</div>

<div>&nbsp;</div>
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>
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ank">https://lists.isc.org/mailman/listinfo/bind-users</a><br></blockquote>=
</div><br>

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