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| comp.protocols.domains Topics related to Domain Style names. |
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LinkBack | Outils de la discussion |
29/06/2007, 15h27
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#1 |
Messages: n/a
Hébergeur: |
Get TTL of a DNS record
I want to gather some statistics on TTL of certain NS records. When
I'm using 'dig' command (e.g. 'dig com. NS') several times I'm getting cached decreasing TTL values. I've tried to clear the local DNS cache with 'lookupd -flushcache', but it did not . Is there is a way to get an original TTL for a given domain name? Regards, Sergei |
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29/06/2007, 19h24
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#2 |
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Messages: n/a
Hébergeur: |
Re: Get TTL of a DNS record
silentser@gmail.com writes:
>I want to gather some statistics on TTL of certain NS records. When >I'm using 'dig' command (e.g. 'dig com. NS') several times I'm getting >cached decreasing TTL values. I've tried to clear the local DNS cache >with 'lookupd -flushcache', but it did not . Is there is a way to >get an original TTL for a given domain name? Do the lookup at the authoritative server for the record you are requesting. I'll use your email domain "googlegroups.com" as an example. % dig googlegroups.com ;; ANSWER SECTION: googlegroups.com. 3520 IN A 64.233.161.104 googlegroups.com. 3520 IN A 72.14.209.104 ;; AUTHORITY SECTION: googlegroups.com. 345520 IN NS ns3.google.com. googlegroups.com. 345520 IN NS ns4.google.com. googlegroups.com. 345520 IN NS ns1.google.com. googlegroups.com. 345520 IN NS ns2.google.com. This tells me that ns1.google.com is one of the authoritative servers for the domain. % dig @ns1.google.com. googlegroups.com ;; ANSWER SECTION: googlegroups.com. 3600 IN A 72.14.209.104 googlegroups.com. 3600 IN A 64.233.161.104 ;; AUTHORITY SECTION: googlegroups.com. 345600 IN NS ns1.google.com. googlegroups.com. 345600 IN NS ns2.google.com. googlegroups.com. 345600 IN NS ns3.google.com. googlegroups.com. 345600 IN NS ns4.google.com. This time I got a full TTL."googlegroups.com" as an example. % dig googlegroups.com ;; ANSWER SECTION: googlegroups.com. 3520 IN A 64.233.161.104 googlegroups.com. 3520 IN A 72.14.209.104 ;; AUTHORITY SECTION: googlegroups.com. 345520 IN NS ns3.google.com. googlegroups.com. 345520 IN NS ns4.google.com. googlegroups.com. 345520 IN NS ns1.google.com. googlegroups.com. 345520 IN NS ns2.google.com. This tells me that ns1.google.com is one of the authoritative servers for the domain. % dig @ns1.google.com. googlegroups.com ;; ANSWER SECTION: googlegroups.com. 3600 IN A 72.14.209.104 googlegroups.com. 3600 IN A 64.233.161.104 ;; AUTHORITY SECTION: googlegroups.com. 345600 IN NS ns1.google.com. googlegroups.com. 345600 IN NS ns2.google.com. googlegroups.com. 345600 IN NS ns3.google.com. googlegroups.com. 345600 IN NS ns4.google.com. This time I got a full TTL. This won't always work (some servers are improperly configure, or maybe a firewall prevents you contacting anything but the company DNS server). |
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01/07/2007, 15h20
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#3 |
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Messages: n/a
Hébergeur: |
Re: Get TTL of a DNS record
On Jun 29, 8:24 pm, Neil W Rickert <rickert...@cs.niu.edu> wrote:
> silent...@gmail.com writes: > >I want to gather some statistics on TTL of certain NS records. When > >I'm using 'dig' command (e.g. 'dig com. NS') several times I'm getting > >cached decreasing TTL values. I've tried to clear the local DNS cache > >with 'lookupd -flushcache', but it did not . Is there is a way to > >get an original TTL for a given domain name? > > Do the lookup at the authoritative server for the record you are > requesting. > > I'll use your email domain "googlegroups.com" as an example. > > % dig googlegroups.com > ;; ANSWER SECTION: > googlegroups.com. 3520 IN A 64.233.161.104 > googlegroups.com. 3520 IN A 72.14.209.104 > > ;; AUTHORITY SECTION: > googlegroups.com. 345520 IN NS ns3.google.com. > googlegroups.com. 345520 IN NS ns4.google.com. > googlegroups.com. 345520 IN NS ns1.google.com. > googlegroups.com. 345520 IN NS ns2.google.com. > > This tells me that ns1.google.com is one of the authoritative > servers for the domain. > > % dig @ns1.google.com. googlegroups.com > > ;; ANSWER SECTION: > googlegroups.com. 3600 IN A 72.14.209.104 > googlegroups.com. 3600 IN A 64.233.161.104 > > ;; AUTHORITY SECTION: > googlegroups.com. 345600 IN NS ns1.google.com. > googlegroups.com. 345600 IN NS ns2.google.com. > googlegroups.com. 345600 IN NS ns3.google.com. > googlegroups.com. 345600 IN NS ns4.google.com. > > This time I got a full TTL."googlegroups.com" as an example. > > % dig googlegroups.com > > ;; ANSWER SECTION: > googlegroups.com. 3520 IN A 64.233.161.104 > googlegroups.com. 3520 IN A 72.14.209.104 > > ;; AUTHORITY SECTION: > googlegroups.com. 345520 IN NS ns3.google.com. > googlegroups.com. 345520 IN NS ns4.google.com. > googlegroups.com. 345520 IN NS ns1.google.com. > googlegroups.com. 345520 IN NS ns2.google.com. > > This tells me that ns1.google.com is one of the authoritative > servers for the domain. > > % dig @ns1.google.com. googlegroups.com > > ;; ANSWER SECTION: > googlegroups.com. 3600 IN A 72.14.209.104 > googlegroups.com. 3600 IN A 64.233.161.104 > > ;; AUTHORITY SECTION: > googlegroups.com. 345600 IN NS ns1.google.com. > googlegroups.com. 345600 IN NS ns2.google.com. > googlegroups.com. 345600 IN NS ns3.google.com. > googlegroups.com. 345600 IN NS ns4.google.com. > > This time I got a full TTL. > > This won't always work (some servers are improperly configure, or > maybe a firewall prevents you contacting anything but the company > DNS server). Thanks a lot! That is what I needed! Sergei |
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