Geekzone: technology news, blogs, forums
Guest
Welcome Guest.
You haven't logged in yet. If you don't have an account you can register now.




12 posts

Geek


Topic # 89471 2-Sep-2011 20:22
Send private message

Have had trouble this evening (ie broken internets!) using OpenDNS. Changing to Slingshot's own DNS servers or Google's DNS works fine. OpenDNS don't list any issues and I can use them no problem via a VPN, so what's up at Slingshot with accessing OpenDNS?

View this topic in a long page with up to 500 replies per page Create new topic
 1 | 2
3456 posts

Uber Geek
+1 received by user: 1902

Trusted
Spark NZ

  Reply # 515924 2-Sep-2011 20:25
Send private message

TheGreyPilgrim: Have had trouble this evening (ie broken internets!) using OpenDNS. Changing to Slingshot's own DNS servers or Google's DNS works fine. OpenDNS don't list any issues and I can use them no problem via a VPN, so what's up at Slingshot with accessing OpenDNS?


Do a search on here for the number of posts outlining why there's no benefit to using 3rd party DNS in NZ, and why in fact it almost always makes your experience worse.

Cheers - N


84 posts

Master Geek


  Reply # 515925 2-Sep-2011 20:26
Send private message

I experienced this same problem a few days ago, and noted it was out for a couple of hours ... well, I have to admit that a couple of hours past before I changed back to opendns to frind it working again, but with the same problem tonight am also wondering what Slingshot are upto?

 
 
 
 


Try Wrike: fast, easy, and efficient project collaboration software
84 posts

Master Geek


  Reply # 515926 2-Sep-2011 20:29
Send private message

Talkiet:
TheGreyPilgrim: Have had trouble this evening (ie broken internets!) using OpenDNS. Changing to Slingshot's own DNS servers or Google's DNS works fine. OpenDNS don't list any issues and I can use them no problem via a VPN, so what's up at Slingshot with accessing OpenDNS?


Do a search on here for the number of posts outlining why there's no benefit to using 3rd party DNS in NZ, and why in fact it almost always makes your experience worse.

Cheers - N

The free filtering services opendns offers is the only reason I use opendns ...will do a serch though cheers.

Aussie
4183 posts

Uber Geek
+1 received by user: 1175

Trusted
Subscriber

  Reply # 515930 2-Sep-2011 20:33
Send private message

Talkiet:
Do a search on here for the number of posts outlining why there's no benefit to using 3rd party DNS in NZ, and why in fact it almost always makes your experience worse.

Cheers - N



QFT!
Quote For Truth...
Search GZ for this.

3456 posts

Uber Geek
+1 received by user: 1902

Trusted
Spark NZ

  Reply # 515933 2-Sep-2011 20:36
Send private message

FreddyK:
Talkiet:
TheGreyPilgrim: Have had trouble this evening (ie broken internets!) using OpenDNS. Changing to Slingshot's own DNS servers or Google's DNS works fine. OpenDNS don't list any issues and I can use them no problem via a VPN, so what's up at Slingshot with accessing OpenDNS?


Do a search on here for the number of posts outlining why there's no benefit to using 3rd party DNS in NZ, and why in fact it almost always makes your experience worse.

Cheers - N

The free filtering services opendns offers is the only reason I use opendns ...will do a serch though cheers.


Well, that's actually a legit reason you have there :-) It's worth understanding the other performance implications though - check out both sides of the story - you may well be using the most appropriate solution.

Cheers - N




12 posts

Geek


  Reply # 515936 2-Sep-2011 20:41
Send private message

Talkiet: Do a search on here for the number of posts outlining why there's no benefit to using 3rd party DNS in NZ, and why in fact it almost always makes your experience worse.

Cheers - N



Like FreddyK I use them mainly for the filtering options to prevent my kids stumbling on questionable sites. I also like the fact they've been proactive (and first/only in some cases) in protection against some DNS flaws/exploits in the past. That said I'm interested in what others say re performance...

26196 posts

Uber Geek
+1 received by user: 5796

Moderator
Trusted
Biddle Corp
Lifetime subscriber

  Reply # 516006 3-Sep-2011 00:31
Send private message

TheGreyPilgrim:
Talkiet: Do a search on here for the number of posts outlining why there's no benefit to using 3rd party DNS in NZ, and why in fact it almost always makes your experience worse.

Cheers - N



Like FreddyK I use them mainly for the filtering options to prevent my kids stumbling on questionable sites. I also like the fact they've been proactive (and first/only in some cases) in protection against some DNS flaws/exploits in the past. That said I'm interested in what others say re performance...


Using a 3rd party DNS sever such as Google or OpenDNS will break every major CDN and deliver sub optimal internet performance for sites such as YouTube and Akamai where a significant % of major internet content is served from, and will also result in sluggish browing due to the high latency for every DNS lookup. If you believe the benefits of the 3rd party DNS outweight the massive hit in internet performance then feel free to use them. If you want optimal internet performance then stick with your ISP's DNS servers as these are your best bet.







12 posts

Geek


  Reply # 516028 3-Sep-2011 08:00
Send private message

sbiddle:
Using a 3rd party DNS sever such as Google or OpenDNS will break every major CDN and deliver sub optimal internet performance for sites such as YouTube and Akamai where a significant % of major internet content is served from, and will also result in sluggish browing due to the high latency for every DNS lookup. If you believe the benefits of the 3rd party DNS outweight the massive hit in internet performance then feel free to use them. If you want optimal internet performance then stick with your ISP's DNS servers as these are your best bet.


Until I saw the Google/OpenDNS "Global Internet Speedup" initiative (afasterinternet.com) this week I never really considered CDN issues. Well duh, don't I feel stupid! I always assumed DNS servers were location aware and would give you the closest CDN IP based my location and not the DNS location - do none of them do that? ie is this initiative the first to solve this problem? (I can't believe this hasn't been thought of or addressed before now...!)

As for latency for basic website browsing (ie non CDN stuff), I've run GRC's DNS Benchmark in the past (should do it again actually) and I think that's a non-issue compared to other factors that might come into play - ie it's a tiny hit to take at the start of a connection, which can be far outweighed by a slow web server or bad javascript on a page for example.

So a related question to my initial post re Slingshot/OpenDNS, are there any ISP's that restrict specific DNS use? I imagine some might only let their own customers use their own DNS, but does anyone block 3rd party DNS?

26196 posts

Uber Geek
+1 received by user: 5796

Moderator
Trusted
Biddle Corp
Lifetime subscriber

  Reply # 516032 3-Sep-2011 08:26
Send private message

While I don't personally know of any ISP's that restict access to 3rd party DNS servers, there does exist a good business case for an ISP to force redirects so that the use of 3rd party DNS servers was bypassed and all DNS requests went through their own DNS servers.

To use an example if you're an ISP offering unlimited YouTube and have a Google cache installed, somebody running a 3rd party DNS server such as OpenDNS will typically see their YouTube traffic will originate from the USA, meaning that the end user is not being zero rated for this traffic and will obviously then start saying the ISP is ripping them of. if the ISP redirected all DNS traffic to their own servers this wou;dn't be able to occur.




602 posts

Ultimate Geek
+1 received by user: 65

Trusted

  Reply # 516057 3-Sep-2011 09:42
Send private message

TheGreyPilgrim:
sbiddle:
Using a 3rd party DNS sever such as Google or OpenDNS will break every major CDN and deliver sub optimal internet performance for sites such as YouTube and Akamai where a significant % of major internet content is served from, and will also result in sluggish browing due to the high latency for every DNS lookup.?If you believe the benefits of the 3rd party DNS outweight the massive hit in internet performance then feel free to use them. If you want optimal internet performance then stick with your ISP's DNS servers as these are your best bet.


Until I saw the Google/OpenDNS "Global Internet Speedup" initiative (afasterinternet.com) this week I never really considered CDN issues. Well duh, don't I feel stupid! I always assumed DNS servers were location aware and would give you the closest CDN IP based my location and not the DNS location - do none of them do that? ie is this initiative the first to solve this problem? (I can't believe this hasn't been thought of or addressed before now...!)

As for latency for basic website browsing (ie non CDN stuff), I've run GRC's DNS Benchmark in the past (should do it again actually) and I think that's a non-issue compared to other factors that might come into play - ie it's a tiny hit to take at the start of a connection, which can be far outweighed by a slow web server or bad javascript on a page for example.

So a related question to my initial post re Slingshot/OpenDNS, are there any ISP's that restrict specific DNS use? I imagine some might only let their own customers use their own DNS, but does anyone block 3rd party DNS?


If you havn't already, read http://www.geekzone.co.nz/freitasm/6980

Then read http://www.geekzone.co.nz/forums.asp?forumid=95&topicid=89241&page_no=3#514874

Several ISPs have restricted external access to their DNS servers recursively - this was done a couple of years back in response to a vulnerability in DNS and particularly BIND (a popular DNS server) to reduce the threat footprint.
Prior to this it was quite common for resolvers to provide recursive service (to answer queries regardless of where they came from or where they were destined for) but there are quite a few who now lock this down.

Orcon leap out as one of the most obvious.

(This is problematic for folks outside of Orcon trying to troubleshoot DNS related faults for Orcon users, among other things.)

Your query goes to your DNS server, whatever you have specified.
The DNS server serves its cached answer, if it exists, or it makes the onward queries on your behalf, as described in the second link above. If the query is received by a CDN from the US East Coast (for example), then the CDN is going to serve you up a response that suits someone in the US East Coast. Not NZ.




BDFL - Memuneh
59991 posts

Uber Geek
+1 received by user: 11092

Administrator
Trusted
Geekzone
Lifetime subscriber

  Reply # 516063 3-Sep-2011 09:56
Send private message

TheGreyPilgrim: Like FreddyK I use them mainly for the filtering options to prevent my kids stumbling on questionable sites.


Try http://explore.live.com/windows-live-family-safety for Parental Control then and stop messing with DNS...







325 posts

Ultimate Geek
+1 received by user: 7


  Reply # 516232 3-Sep-2011 21:00
Send private message

sbiddle:Using a 3rd party DNS sever such as Google or OpenDNS will break every major CDN and deliver sub optimal internet performance for sites such as YouTube and Akamai where a significant % of major internet content is served from, and will also result in sluggish browing due to the high latency for every DNS lookup. If you believe the benefits of the 3rd party DNS outweight the massive hit in internet performance then feel free to use them.

This isn't a problem for some CDNs any more apparently:  Google, OpenDNS deploy DNS tweak for faster browsing . I haven't been bothered by it here previously, but we don't use a lot of YouTube or whatever anyway.

BDFL - Memuneh
59991 posts

Uber Geek
+1 received by user: 11092

Administrator
Trusted
Geekzone
Lifetime subscriber

  Reply # 516267 3-Sep-2011 22:23
Send private message

First that os non-official and non-standard. Second, Akamai is not part of it, so it doesn't help much...




3456 posts

Uber Geek
+1 received by user: 1902

Trusted
Spark NZ

  Reply # 516269 3-Sep-2011 22:25
Send private message

freitasm: First that os non-official and non-standard. Second, Akamai is not part of it, so it doesn't help much...


Thirdly, their DNS servers are still hundred of miilliseconds further away :-)

Cheers - N

325 posts

Ultimate Geek
+1 received by user: 7


  Reply # 516293 3-Sep-2011 23:31
Send private message

freitasm: First that os non-official and non-standard. Second, Akamai is not part of it, so it doesn't help much...

It solves the YouTube problem apparently, so it helps a bit. Also if you like you can whitelist certain sites for ISP DNS resolution, e.g. using DD-WRT.

 1 | 2
View this topic in a long page with up to 500 replies per page Create new topic



Twitter »

Follow us to receive Twitter updates when new discussions are posted in our forums:



Follow us to receive Twitter updates when news items and blogs are posted in our frontpage:



Follow us to receive Twitter updates when tech item prices are listed in our price comparison site:





News »

Amazon launches the International Shopping Experience in the Amazon Shopping App
Posted 19-Apr-2018 08:38


Spark New Zealand and TVNZ to bring coverage of Rugby World Cup 2019
Posted 16-Apr-2018 06:55


How Google can seize Microsoft Office crown
Posted 14-Apr-2018 11:08


How back office transformation drives IRD efficiency
Posted 12-Apr-2018 21:15


iPod laws in a smartphone world: will we ever get copyright right?
Posted 12-Apr-2018 21:13


Lightbox service using big data and analytics to learn more about customers
Posted 9-Apr-2018 12:11


111 mobile caller location extended to iOS
Posted 6-Apr-2018 13:50


Huawei announces the HUAWEI P20 series
Posted 29-Mar-2018 11:41


Symantec Internet Security Threat Report shows increased endpoint technology risks
Posted 26-Mar-2018 18:29


Spark switches on long-range IoT network across New Zealand
Posted 26-Mar-2018 18:22


Stuff Pix enters streaming video market
Posted 21-Mar-2018 09:18


Windows no longer Microsoft’s main focus
Posted 13-Mar-2018 07:47


Why phone makers are obsessed with cameras
Posted 11-Mar-2018 12:25


New Zealand Adopts International Open Data Charter
Posted 3-Mar-2018 12:48


Shipments tumble as NZ phone upgrades slow
Posted 2-Mar-2018 11:48



Geekzone Live »

Try automatic live updates from Geekzone directly in your browser, without refreshing the page, with Geekzone Live now.



Are you subscribed to our RSS feed? You can download the latest headlines and summaries from our stories directly to your computer or smartphone by using a feed reader.

Alternatively, you can receive a daily email with Geekzone updates.