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DNS problems?

linux
Grafter
Posts: 146
Registered: ‎23-08-2007

DNS problems?

‎30-11-2015 4:27 PM

Hi,
I don't seem to be able to perform any DNS lookups other than via Plusnet's own DNS servers.
For example, the following Linux commands work OK with Plusnet's DNS servers:
dig @212.159.13.49 www.google.co.uk
dig @212.159.13.50 www.google.co.uk
However the following Linux commands all hang with Google Public DNS servers and OpenDNS servers:
dig @8.8.8.8 www.google.co.uk
dig @8.8.4.4 www.google.co.uk
dig @208.67.222.222 www.google.co.uk
dig @208.67.220.220 www.google.co.uk
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linux
Grafter
Posts: 146
Registered: ‎23-08-2007

Re: DNS problems?

‎30-11-2015 8:28 PM

Are other people still able to use non-Plusnet DNS servers? To be clear, the connection to the servers is not the problem: I can ping them OK, but I cannot use them for DNS lookups.
It is almost as though Plusnet is blocking DNS requests to non-Plusnet DNS servers.
Is it something to do with Plusnet SafeGuard? Its FAQ does mention DNS.
Should I raise a support ticket?
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chillypenguin
Grafter
Posts: 4,729
Registered: ‎04-04-2007

Re: DNS problems?

‎30-11-2015 8:51 PM

Have you got Plusnet SafeGuard enabled?
At a guess this should disable other DNS servers, to prevent circumvention.
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linux
Grafter
Posts: 146
Registered: ‎23-08-2007

Re: DNS problems?

‎30-11-2015 9:46 PM

No, my Member Centre says Plusnet SafeGuard is off.
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bobpullen
Community Gaffer
Community Gaffer
Posts: 16,887
Thanks: 4,979
Fixes: 316
Registered: ‎04-04-2007

Re: DNS problems?

‎01-12-2015 7:03 AM

Quote from: Chilly
Have you got Plusnet SafeGuard enabled?
At a guess this should disable other DNS servers, to prevent circumvention.

Safeguard uses a different pair of DNS resolvers.
What router are you using? Is the Plusnet server Firewall enabled (although I don't think the latter should make any difference).

Bob Pullen
Plusnet Product Team
If I've been helpful then please give thanks ⤵
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linux
Grafter
Posts: 146
Registered: ‎23-08-2007

Re: DNS problems?

‎01-12-2015 9:08 AM

This morning other DNS servers are working normally again, without me having changed anything.
To answer your questions, my router is a Netgear DG834G, and my Broadband Firewall is off.
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bobpullen
Community Gaffer
Community Gaffer
Posts: 16,887
Thanks: 4,979
Fixes: 316
Registered: ‎04-04-2007

Re: DNS problems?

‎01-12-2015 4:38 PM

Odd.
Did you try any sites other than Google when the problem was evident?

Bob Pullen
Plusnet Product Team
If I've been helpful then please give thanks ⤵
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linux
Grafter
Posts: 146
Registered: ‎23-08-2007

Re: DNS problems?

‎01-12-2015 11:59 PM

Yes; I couldn't resolve any host names until I switched from Google Public DNS to Plusnet. After that I was able to resolve all host names.
Today things are back to normal.
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bobpullen
Community Gaffer
Community Gaffer
Posts: 16,887
Thanks: 4,979
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Registered: ‎04-04-2007

Re: DNS problems?

‎03-12-2015 12:22 PM

Very curious.
If it was just Google-hosted stuff then the difference might have been explained by the fact that we have Google caches on our network.
Aside from that, I'm out of ideas. Shout up if it happens again.

Bob Pullen
Plusnet Product Team
If I've been helpful then please give thanks ⤵
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