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Topic # 84161 26-May-2011 01:47
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Does anybody know [a good way to tell] if the TelstraClear DNS servers (.43 & .44) are actually physically separate servers, or just IP's of convenience pointing to the same server?  

I've wondered for a while if a lot of the trouble that I and others have with TelstraClear performance can be laid at the feet of overloaded DNS servers, and tonight I happened to be here when both DNS IP's were simultaneously non-responsive (to both DNS requests and pings) for a while, during which time other IP's were responding fine, then suddenly the simultaneously came back to life.

Sure it could be explained by them being on the same network segment etc but even if that were the case, is it really acceptable for such a crucial part of the network infrastructure of TelstraClear to have such little redundancy?  Especially since in practical terms, we have no choice but to resolve using those DNS servers lest CDN's get confused by the proxy.




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  Reply # 474230 26-May-2011 07:40
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Was that just after midnight?

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  Reply # 474235 26-May-2011 08:04
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Kinda off topic, but if you are worried about DNS servers going offline, then modify your DNS settings. I use google's DNS servers as a backup (8.8.8.8)

I would imagine that TC would have load balancing and failover for their DNS servers, but I don't know for sure.

 
 
 
 


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  Reply # 474241 26-May-2011 08:20
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Not sure what DNS Servers you are talking about, but I always use these TelstraClear ones

203.97.33.1
203.97.37.1

Both are pingable and I always use the top one for ping tests, as it's one of the first IP addresses I ever memorized!




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  Reply # 474250 26-May-2011 08:43
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jaymz: Kinda off topic, but if you are worried about DNS servers going offline, then modify your DNS settings. I use google's DNS servers as a backup (8.8.8.8)

I would imagine that TC would have load balancing and failover for their DNS servers, but I don't know for sure.


Using anything other than your ISP's DNS servers is the world thing in the world to do and will cause problems. It's something that nobody should do because it messes with CDN's, something pointed out in the original post.

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  Reply # 474258 26-May-2011 09:04
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exportgoldman: Not sure what DNS Servers you are talking about, but I always use these TelstraClear ones

203.97.33.1
203.97.37.1

Both are pingable and I always use the top one for ping tests, as it's one of the first IP addresses I ever memorized!


You should be using the ClearNet ones, 43/44.




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  Reply # 474259 26-May-2011 09:05
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DO not use random DNS servers (IE Google) unless you know 100% what your doing as it can mess up CDNs and cause big performance impacts on your connection.





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  Reply # 474263 26-May-2011 09:28
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Thanks Zeon and sbiddle, I didn't know about the implications that using different DNS servers could have.

I have only used public DNS addresses in testing/troubleshooting situations, never as a fix.

It does explain why some of my clients have had issues that have been sorted by changing their DNS servers back to their ISP's DNS servers. (Home users who know enough IT to be dangerous!)

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  Reply # 474321 26-May-2011 11:43
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jaymz: Thanks Zeon and sbiddle, I didn't know about the implications that using different DNS servers could have.

I have only used public DNS addresses in testing/troubleshooting situations, never as a fix.

It does explain why some of my clients have had issues that have been sorted by changing their DNS servers back to their ISP's DNS servers. (Home users who know enough IT to be dangerous!)


It'll break the varius CDN's out there and also has the potential to result in being billed for traffic if you ISP has offers for zero rated sites.

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  Reply # 474712 27-May-2011 11:07
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This was posted to NZNOG Today by Olof, who I know posts here too. Olof, I hope you don't mind me sharing it with the masses.


NZNOG,
This message is to inform you that TelstraClear will be making changes to its recursive DNS service for broadband and dialup customers.

As part of TelstraClear's ongoing network improvements, we are deploying the following enhancements:
--- Current recursive DNS servers to be replaced by multiple geographically diverse DNS clusters;
--- Anycast routing to be implemented to direct traffic to the nearest DNS cluster;
--- Native IPv6 transport implemented for recursive DNS service;
--- Recursive DNS queries will only be accepted from TelstraClear broadband and dialup customers.
TelstraClear is currently allowing some non-TelstraClear New Zealand IP address blocks to access the following recursive DNS servers:

--- 203.97.78.43
--- 203.97.78.44
Once we have deployed the above enhancements, only queries from TelstraClear broadband and dialup customers will be accepted to the TelstraClear recursive DNS servers. If you are currently using the above name servers, and are on non-TelstraClear IP address space, you will need to change your DNS configuration to use alternative name servers.

We will be phasing in these changes from 1 June over a period of several weeks.
If you have any questions regarding this change please feel free to contact me.
      --Olof





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  Reply # 474716 27-May-2011 11:21
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Well, I'll be, that does sound like a significant improvement.  Will be interesting to see how it goes.  




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