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DNS service problem?

jack21
Grafter
Posts: 180
Registered: 25-02-2009

DNS service problem?

Hi,
Am I alone in seeing DNS service problems from 212.159.6.9/10 this morning from 07:11 onwards? Sometimes just 1 of them will do a DNS resolve, sometimes both, and sometimes neither. At all times, both servers remain pingable.
Jack
22 REPLIES
Community Gaffer
Community Gaffer
Posts: 13,152
Thanks: 926
Fixes: 77
Registered: 04-04-2007

Re: DNS service problem?

We seeing an uncharacteristically large number of calls coming in too. There's nothing untoward looking at the graphing mind you and all the caching IPs seem to be responding to queries for me. I'm about to get an internal problem raised as something's definitely not right.

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

jack21
Grafter
Posts: 180
Registered: 25-02-2009

Re: DNS service problem?

Bob,
My impression is that each server gives a DNS answer once, then fails to do so for the next 60 seconds, then resolves again. Remains pingable all the while.
Jack
andydoubleyou
Newbie
Posts: 1
Registered: 19-03-2009

Re: DNS service problem?

I'm getting DNS issues too. Couldn't even navigate to the Plusnet support pages without looking up an alternative DNS server on my phone.
(the openDNS address is 208.67.222.222)
Now browsing is fine.
Andy
Community Gaffer
Community Gaffer
Posts: 13,152
Thanks: 926
Fixes: 77
Registered: 04-04-2007

Re: DNS service problem?

Service Status is posted and we've got our engineers on the case as we speak...

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

Community Veteran
Posts: 38,460
Thanks: 1,027
Fixes: 62
Registered: 15-06-2007

Re: DNS service problem?

needed to change my DNS server to OpenDNS even to get here or receive emails
LiamM
Grafter
Posts: 5,636
Registered: 12-08-2007

Re: DNS service problem?

Looks like it's isolated by gateway.  I hopped around a bit, got onto thn-ag1 and it's working fine.
Lurker
Grafter
Posts: 1,867
Registered: 23-10-2008

Re: DNS service problem?

Quote from: Bob
[...]There's nothing untoward looking at the graphing mind you  [...]

Can you explain what the negative values on the graphs represent Bob?
Surely a graph measuring response times cannot return a negative value unless something is awry; a response time of -10ms indicates that the DNS box sent the answer 10ms before the monitoring server requested it.
Architecturally speaking, where does your DNS monitoring sit? I'm assuming that it sits on your internal network, and queries across the same, where ideally it would be on an ADSL line somewhere, reporting and representing what we all see.
Community Veteran
Posts: 19,100
Thanks: 437
Fixes: 21
Registered: 31-08-2007

Re: DNS service problem?

Quote from: Liam
Looks like it's isolated by gateway.  I hopped around a bit, got onto thn-ag1 and it's working fine.

It's not an isolated gateway, I've had problems on several (not just today).
Lurker
Grafter
Posts: 1,867
Registered: 23-10-2008

Re: DNS service problem?

Not AN isolated gateway, but isolated BY gateway.
i.e. it works ok on some gateways, but not on others.
It looks borked on the majority though if Liams experience is indicative.
MrC
Grafter
Posts: 523
Thanks: 2
Registered: 17-07-2008

Re: DNS service problem?

Quote from: Bob
There's nothing untoward looking at the graphing mind you

You sure Bob? I've just looked and noticed on some graphs that the median value peaks were the highest figures displayed. The maximum values are right off the scale (which is probably to be expected) which makes seeing the short-term trend a bit difficult.
Mike
jack21
Grafter
Posts: 180
Registered: 25-02-2009

Re: DNS service problem?

Bob,
My impression now is that there is no DNS resolution at all from either server.
Jack
Lurker
Grafter
Posts: 1,867
Registered: 23-10-2008

Re: DNS service problem?

Quote from: MrC
[...]I've just looked and noticed on some graphs that the median value peaks were the highest figures displayed. The maximum values are right off the scale[...]

I'd not spotted that - so it looks like there are two fairly significant problems with the graphs that supposedly show everything to be fine...
cjags
Rising Star
Posts: 419
Thanks: 8
Fixes: 1
Registered: 31-08-2007

Re: DNS service problem?

Getting lots of problems too.  Can't connect to email server and web browsing is pants.
LiamM
Grafter
Posts: 5,636
Registered: 12-08-2007

Re: DNS service problem?

Disappointing that this is still a problem.  I've now had 2 referrals ring my mobile asking if there is a problem.  It's not Plusnet they call, it's me!
Anyhow...  I'm on thn-ag1 and it works fine now.. took about 5 or 6 reconnects to find a gateway that worked though.
Disappointingly though, the problem published to the portal hasn't been updated for 2 hours and is still showing the status "To Be Assigned".
http://www.plus.net/support/service/problems/problem.php?intProblemId=55769