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DNS Errors

tudou
Grafter
Posts: 32
Registered: ‎05-04-2011

DNS Errors

‎16-10-2011 3:06 PM

Recently just started having this problem - getting a DNS error when I try to access certain websites (e.g. http://news.baidu.com, http://sina.com.cn), mostly websites in China actually. I can access them fine from my mobile phone (3G network) or from my work computer so it's not the websites.
I configured my connection to use a Google DNS server as a secondary one, but I'm just curious as to why Plus net's DNS servers won't load these web pages?
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ejs
Aspiring Hero
Posts: 5,442
Thanks: 631
Fixes: 25
Registered: ‎10-06-2010

Re: DNS Errors

‎16-10-2011 6:04 PM

I'm not getting a DNS error but both those websites just time out. The traceroute doesn't appear to leave plusnet's network:
# traceroute -T -p 80 news.baidu.com
traceroute to news.baidu.com (123.125.114.18), 30 hops max, 60 byte packets
1  192.168.0.1 (192.168.0.1)  3.507 ms  6.593 ms  6.836 ms
2  lo0-central5.pcl-ag02.plus.net (195.166.130.89)  27.343 ms  29.656 ms  29.969 ms
3  gi7-21-252.pcl-gw02.plus.net (84.93.255.99)  30.273 ms  31.213 ms  35.121 ms
4  po4.pcl-gw01.plus.net (212.159.1.128)  37.464 ms  39.016 ms  39.413 ms
5  * * *
6  * * *
7  * * *
...
28  * * *
29  * * *
30  * * *
Google's and Plusnet's DNS servers give me the same IP addresses for those sites.
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Oldjim
Resting Legend
Posts: 38,460
Thanks: 787
Fixes: 63
Registered: ‎15-06-2007

Re: DNS Errors

‎16-10-2011 6:13 PM

I get DNS errors and putting in 123.125.114.18 doesn't get past the third hop.
I wonder if IWF is blocking it in error
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Anonymous
Not applicable

Re: DNS Errors

‎16-10-2011 6:31 PM

Similar results here too -  Undecided
$ mtr -r -c 100 sina.com.cn
HOST: my_laptop                   Loss%   Snt   Last   Avg  Best  Wrst StDev
  1. my_adsl_gateway               0.0%   100    1.9   2.0   1.8   8.4   0.7
  2. lo0-homesurf.ptn-ag03.plus.n  0.0%   100   14.2  18.0  13.3  63.0   7.7
  3. gi2-8-805.ptn-gw01.plus.net  98.0%   100   13.2  13.7  13.2  14.2   0.8
  4. ???                          100.0   100    0.0   0.0   0.0   0.0   0.0

Cry
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scootie
Grafter
Posts: 4,799
Thanks: 1
Registered: ‎03-11-2007

Re: DNS Errors

‎16-10-2011 7:26 PM

both ok on virgin media, tried PN dns in adapter proprieties  with .49 being primary and not a sausage, internet dead.
C:\Users\scootie>nslookup news.baidu.com
Server:  cache1.service.virginmedia.net
Address:  194.168.4.100
Non-authoritative answer:
Name:    news.n.shifen.com
Address:  123.125.114.18
Aliases:  news.baidu.com

C:\Users\scootie>nslookup news.baidu.com
DNS request timed out.
    timeout was 2 seconds.
Server:  UnKnown
Address:  212.159.13.49
DNS request timed out.
    timeout was 2 seconds.
DNS request timed out.
    timeout was 2 seconds.
DNS request timed out.
    timeout was 2 seconds.
DNS request timed out.
    timeout was 2 seconds.
*** Request to UnKnown timed-out
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Anonymous
Not applicable

Re: DNS Errors

‎16-10-2011 9:37 PM

I got slightly different results to 'Asbo Dog'  -
[code=Google DNS]$ dig @8.8.8.8 news.baidu.com a
; <<>> DiG 9.7.1-P2 <<>> @8.8.8.8 news.baidu.com a
; (1 server found)
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 36132
;; flags: qr rd ra; QUERY: 1, ANSWER: 2, AUTHORITY: 0, ADDITIONAL: 0
;; QUESTION SECTION:
;news.baidu.com. IN A
;; ANSWER SECTION:
news.baidu.com. 1029 IN CNAME news.n.shifen.com.
news.n.shifen.com. 129 IN A 123.125.114.18
;; Query time: 34 msec
;; SERVER: 8.8.8.8#53(8.8.8.8)
;; WHEN: Sun Oct 16 21:20:52 2011
;; MSG SIZE  rcvd: 76
[/code]
[code=OpenDNS]$ dig @208.67.220.220 news.baidu.com a
; <<>> DiG 9.7.1-P2 <<>> @208.67.220.220 news.baidu.com a
; (1 server found)
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 18030
;; flags: qr rd ra; QUERY: 1, ANSWER: 2, AUTHORITY: 0, ADDITIONAL: 0
;; QUESTION SECTION:
;news.baidu.com. IN A
;; ANSWER SECTION:
news.baidu.com. 638 IN CNAME news.n.shifen.com.
news.n.shifen.com. 43 IN A 123.125.114.18
;; Query time: 63 msec
;; SERVER: 208.67.220.220#53(208.67.220.220)
;; WHEN: Sun Oct 16 21:21:18 2011
;; MSG SIZE  rcvd: 76
[/code]
[code=Plusnet DNS]$ dig @212.159.13.49 news.baidu.com a
; <<>> DiG 9.7.1-P2 <<>> @212.159.13.49 news.baidu.com a
; (1 server found)
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 48030
;; flags: qr rd ra; QUERY: 1, ANSWER: 2, AUTHORITY: 0, ADDITIONAL: 0
;; QUESTION SECTION:
;news.baidu.com. IN A
;; ANSWER SECTION:
news.baidu.com. 1200 IN CNAME news.n.shifen.com.
news.n.shifen.com. 300 IN A 123.125.114.18
;; Query time: 3437 msec
;; SERVER: 212.159.13.49#53(212.159.13.49)
;; WHEN: Sun Oct 16 21:22:00 2011
;; MSG SIZE  rcvd: 76[/code]
So all three DNS returned the same IP address, Smiley  just Plusnet took the longest to respond AS USUAL  Angry
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bobpullen
Community Gaffer
Community Gaffer
Posts: 16,887
Thanks: 4,979
Fixes: 316
Registered: ‎04-04-2007

Re: DNS Errors

‎17-10-2011 11:50 AM

Both sites seems resolvable now, although they're *very* slow to load!

Bob Pullen
Plusnet Product Team
If I've been helpful then please give thanks ⤵
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Anonymous
Not applicable

Re: DNS Errors

‎17-10-2011 12:27 PM

The packet losses do seem a bit grim ! - but at least it reaches it's destination now  Roll_eyes
$ mtr -r -c 100 sina.com.cn
HOST: my_desktop_pc               Loss%   Snt   Last   Avg  Best  Wrst StDev
  1. my_adsl_gateway               0.0%   100    4.9   4.1   3.1  10.4   1.2
  2. lo0-homesurf.ptn-ag03.plus.n 37.0%   100   18.5  25.4  15.3 111.1  20.2
  3. gi2-8-805.ptn-gw01.plus.net  61.0%   100   25.0  42.6  23.6 217.5  44.8
  4. po5.pcl-gw01.plus.net        57.0%   100   26.5  32.7  24.4 178.6  24.6
  5. po4.pcl-gw02.plus.net        51.0%   100   24.6  37.1  16.8 181.7  30.4
  6. 195.50.122.129               73.0%   100   24.4  27.6  24.1  57.0   7.5
  7. ae-52-52.csw2.London1.Level3 56.0%   100   27.3  28.1  23.7  58.2   5.8
  8. ae-58-223.ebr2.London1.Level 59.0%   100   25.7  25.1  15.4  28.4   2.0
  9. ae-44-44.ebr1.NewYork1.Level 78.0%   100   94.2  97.7  86.1 160.9  14.5
 10. ae-81-81.csw3.NewYork1.Level 85.0%   100   94.8 101.7  93.2 111.7   6.0
 11. ae-3-80.edge3.NewYork1.Level 63.0%   100   94.9  95.4  86.0 109.0   3.6
 12. att-level3.newyork1.level3.n 84.0%   100  157.6 109.6  93.7 187.2  28.6
 13. cr1.n54ny.ip.att.net         38.0%   100  167.4 172.3 166.2 273.6  14.4
 14. cr2.cgcil.ip.att.net         42.0%   100  170.3 176.0 167.0 287.3  19.8
 15. cr1.cgcil.ip.att.net         76.0%   100  161.4 170.0 161.4 175.4   3.3
 16. cr2.dvmco.ip.att.net         67.0%   100  169.8 170.6 164.2 182.3   3.6
 17. cr1.slkut.ip.att.net         43.0%   100  167.7 171.7 166.7 207.3   6.3
 18. cr2.la2ca.ip.att.net         80.0%   100  159.6 173.7 159.6 251.1  19.7
 19. cr84.la2ca.ip.att.net        59.0%   100  166.8 171.1 166.5 238.4  11.1
 20. gar3.lsrca.ip.att.net        53.0%   100  169.1 173.1 165.8 257.6  17.1
 21. 12.116.103.10                22.0%   100  594.8 613.2 587.4 637.6  11.0
 22. 219.158.4.177                81.0%   100  621.9 613.7 588.8 640.4  15.1
 23. 202.96.12.46                 86.0%   100  590.8 612.4 584.7 714.6  32.4
 24. 61.148.143.22                85.0%   100  584.9 601.5 584.9 618.2  11.0
 25. 210.74.178.198               91.0%   100  608.0 603.0 582.6 618.6  11.9
 26. 202.108.33.60                61.0%   100  608.3 605.3 577.4 704.1  18.7
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