Exetel DNS servers not resolving www.nasa.gov

Connection issues, drop outs or speed related faults for ADSL and ADSL2+ services
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stevebow
Posts: 195
Joined: Tue Oct 12, 2004 12:11 pm
Location: Sydney

Exetel DNS servers not resolving www.nasa.gov

Post by stevebow » Sat Jul 30, 2016 6:27 pm

For some reason the Exetel DNS servers 220.233.0.4 and 220.233.0.3 are not resolving www.nasa.gov:

Code: Select all

C:\Users\Steve>nslookup www.nasa.gov
Server:  kolanut2-dns.exetel.com.au
Address:  220.233.0.4

*** kolanut2-dns.exetel.com.au can't find www.nasa.gov: Server failed
If I change the DNS server setting in Windows/Network to Goggle's public DNS server 8.8.8.8, www.nasa.gov resolves fine and I am able to access the website:

Code: Select all

C:\Users\Steve>nslookup www.nasa.gov
Server:  google-public-dns-a.google.com
Address:  8.8.8.8

Non-authoritative answer:
Name:    iznasa.hs.llnwd.net
Addresses:  2402:6800:712:a000::8003
          203.77.190.71
Aliases:  www.nasa.gov
          www.nasawestprime.com
I see the same problem on my iPad too.

It was working fine earlier today so the problem has only recently cropped up.

Steve

Edit: also with www.jpl.nasa.gov, which should resolve to 137.78.99.24.

sachindaL

Re: Exetel DNS servers not resolving www.nasa.gov

Post by sachindaL » Sat Jul 30, 2016 9:54 pm

stevebow wrote:For some reason the Exetel DNS servers 220.233.0.4 and 220.233.0.3 are not resolving http://www.nasa.gov:

Code: Select all

C:\Users\Steve>nslookup www.nasa.gov
Server:  kolanut2-dns.exetel.com.au
Address:  220.233.0.4

*** kolanut2-dns.exetel.com.au can't find www.nasa.gov: Server failed
If I change the DNS server setting in Windows/Network to Goggle's public DNS server 8.8.8.8, http://www.nasa.gov resolves fine and I am able to access the website:

Code: Select all

C:\Users\Steve>nslookup www.nasa.gov
Server:  google-public-dns-a.google.com
Address:  8.8.8.8

Non-authoritative answer:
Name:    iznasa.hs.llnwd.net
Addresses:  2402:6800:712:a000::8003
          203.77.190.71
Aliases:  www.nasa.gov
          www.nasawestprime.com
I see the same problem on my iPad too.

It was working fine earlier today so the problem has only recently cropped up.

Steve

Edit: also with http://www.jpl.nasa.gov, which should resolve to 137.78.99.24.
We will check on this further. In the meantime, please continue with google DNS.

Dazzled
Volunteer Site Admin
Posts: 6007
Joined: Mon Nov 13, 2006 1:16 pm
Location: Sydney

Re: Exetel DNS servers not resolving www.nasa.gov

Post by Dazzled » Sat Jul 30, 2016 10:45 pm

The story from dig (SERVFAIL):

dig @220.233.0.4 http://www.nasa.gov

; <<>> DiG 9.4.2-P2.1 <<>> @220.233.0.4 http://www.nasa.gov
; (1 server found)
;; global options: printcmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: SERVFAIL, id: 52492
;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 0, ADDITIONAL: 0

;; QUESTION SECTION:
;www.nasa.gov. IN A

;; Query time: 34 msec
;; SERVER: 220.233.0.4#53(220.233.0.4)
;; WHEN: Sat Jul 30 22:43:42 2016
;; MSG SIZE rcvd: 30


ping finds https-203-77-190-71.hkg.llnw.net

stevebow
Posts: 195
Joined: Tue Oct 12, 2004 12:11 pm
Location: Sydney

Re: Exetel DNS servers not resolving www.nasa.gov

Post by stevebow » Sun Jul 31, 2016 9:06 am

sachindaL wrote:We will check on this further. In the meantime, please continue with google DNS.
Seems to be fixed now:

Code: Select all

C:\Users\Steve>nslookup www.nasa.gov
Server:  kolanut2-dns.exetel.com.au
Address:  220.233.0.4

Non-authoritative answer:
Name:    iznasa.hs.llnwd.net
Addresses:  2402:6800:712:a000::8003
          111.119.8.38
Aliases:  www.nasa.gov
          www.nasawestprime.com
What was the problem, out of interest?

Steve

sachindaL

Re: Exetel DNS servers not resolving www.nasa.gov

Post by sachindaL » Sun Jul 31, 2016 9:24 pm

stevebow wrote: Seems to be fixed now:

Code: Select all

C:\Users\Steve>nslookup www.nasa.gov
Server:  kolanut2-dns.exetel.com.au
Address:  220.233.0.4

Non-authoritative answer:
Name:    iznasa.hs.llnwd.net
Addresses:  2402:6800:712:a000::8003
          111.119.8.38
Aliases:  www.nasa.gov
          www.nasawestprime.com
What was the problem, out of interest?

Steve
Glad to hear that it has been fixed now. An explanation should be provided soon :)

sachindaL

Re: Exetel DNS servers not resolving www.nasa.gov

Post by sachindaL » Sat Aug 06, 2016 7:56 pm

The issue was due to caching for this dns record not in caching server and some network issue could not reach authoritative server.

stevebow
Posts: 195
Joined: Tue Oct 12, 2004 12:11 pm
Location: Sydney

Re: Exetel DNS servers not resolving www.nasa.gov

Post by stevebow » Sun Aug 07, 2016 4:00 pm

Thanks for the update.

carl82
Posts: 46
Joined: Sun Apr 04, 2004 4:58 pm
Contact:

Re: Exetel DNS servers not resolving www.nasa.gov

Post by carl82 » Mon Aug 08, 2016 12:29 am

Hi,
i am wondering if a follow on effect of this issue is still present or if not someone could let me know if they experience this issue as well:

we have found that using the internet here (night or day) tends to have dns resolution exceptionally slow and half the time pages will not load/resolve and they need to be stopped, and reloaded to sometimes get results.

the same pages accessed by my laptop at different premises (optus at one place) had no issues. when i got home that night, the issue returned.

i've tried different browsers, pc's, OS's rebooted router etc a heap of times, my router is using :


DNS 1 220.233.0.4
DNS 2 220.233.0.3

thankyou

devindag
Exetel Staff
Posts: 487
Joined: Mon Jun 25, 2012 4:08 pm
Location: Australia

Re: Exetel DNS servers not resolving www.nasa.gov

Post by devindag » Mon Aug 08, 2016 3:17 pm

carl82 wrote:Hi,
i am wondering if a follow on effect of this issue is still present or if not someone could let me know if they experience this issue as well:

we have found that using the internet here (night or day) tends to have dns resolution exceptionally slow and half the time pages will not load/resolve and they need to be stopped, and reloaded to sometimes get results.

the same pages accessed by my laptop at different premises (optus at one place) had no issues. when i got home that night, the issue returned.

i've tried different browsers, pc's, OS's rebooted router etc a heap of times, my router is using :


DNS 1 220.233.0.4
DNS 2 220.233.0.3

thankyou
Hi Carl82,

This issue is currently being looked in to.
Exetel apologize for the inconvenience caused.

carl82
Posts: 46
Joined: Sun Apr 04, 2004 4:58 pm
Contact:

Re: Exetel DNS servers not resolving www.nasa.gov

Post by carl82 » Thu Aug 11, 2016 2:06 pm

thanks for the update, will the details/ fix be posted here or a different post?

thanks
carl

KavindaS
Exetel Staff
Posts: 2715
Joined: Wed Dec 23, 2009 3:59 pm
Location: Sydney

Re: Exetel DNS servers not resolving www.nasa.gov

Post by KavindaS » Thu Aug 11, 2016 4:18 pm

carl82 wrote:thanks for the update, will the details/ fix be posted here or a different post?

thanks
carl
I have checked this with our senior engineers and they have confirmed the issue has been fixed now. If you have further issues to the same site or any other, send an email (residentialsupport@exetel.com.au) to us with the ping and trace results.

stevebow
Posts: 195
Joined: Tue Oct 12, 2004 12:11 pm
Location: Sydney

Re: Exetel DNS servers not resolving www.nasa.gov

Post by stevebow » Sat Aug 13, 2016 5:55 pm

Thanks for the update. I've also been experiencing sporadic issues as described above (and Whirlpool) over the last week or so and had put it down to extra server loading due to the Olympics. I changed my DNS server settings from Exetel's over to Google's 8.8.8.8 though, and that seemed to have improved things. I'll go back to Extetel's servers and will report back any further issues.

Dazzled
Volunteer Site Admin
Posts: 6007
Joined: Mon Nov 13, 2006 1:16 pm
Location: Sydney

Re: Exetel DNS servers not resolving www.nasa.gov

Post by Dazzled » Sat Aug 13, 2016 8:11 pm

There are lots of ideas around about the contents of a DNS query response, many wrong. The server answers name requests only.

Both the query and response are binary, for speed. A description of the response information format is at http://www.firewall.cx/networking-topic ... ponse.html.

The software to fully decode the packet into plain English is dig. A built-in for most Linux setups, the Windows version is discussed at http://nil.uniza.sk/linux-howto/how-ins ... windows-10

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