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DNS weirdness

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Community Gaffer
Community Gaffer
Posts: 14,569
Thanks: 2,182
Fixes: 152
Registered: ‎04-04-2007

Re: DNS weirdness

I'm not 100% sure tbh but will try and find out for you. I think it was a separate issue. Either way we've not seen a recurrence that I'm aware of since yesterday.
Edit: asked the guys who've been looking after the investigation and the consensus is that the failed health checks were the result of something else. Having said that we don't think it's massively service affecting when it does happen as it's always the TCP listener that fails and not UDP (which is what the vast majority of DNS requests are sent using anyway).

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

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Newbie
Posts: 9
Registered: ‎08-07-2009

Re: DNS weirdness

Still no update on the service status which was due at 13:00 today.
I've been on and off this afternoon, believe it may have happened again twice. Can't be sure, guess we'll see how the evening pans out.
**EDIT** Just run my traces again, these may interest you, alot better than yesterday and so far this evening i've had no problems XD:
Quote
Microsoft Windows [Version 6.0.6001]
Copyright (c) 2006 Microsoft Corporation.  All rights reserved.
C:\Users\Adam Streather>tracert 212.159.13.49
Tracing route to pth-cdns01.plus.net [212.159.13.49]
over a maximum of 30 hops:
  1     1 ms     1 ms     1 ms  192.168.0.1
  2    42 ms    39 ms    40 ms  lo0-plusnet.pcl-ag01.plus.net [195.166.128.27]
  3   179 ms   201 ms   197 ms  gi1-2-803.pcl-gw1.plus.net [84.92.5.57]
  4    37 ms    43 ms    47 ms  vl63.pcl-lb01.plus.net [212.159.2.252]
  5    40 ms    41 ms    49 ms  pth-cdns01.plus.net [212.159.13.49]
Trace complete.
C:\Users\Adam Streather>tracert 212.159.13.50
Tracing route to pth-cdns02.plus.net [212.159.13.50]
over a maximum of 30 hops:
  1     1 ms     2 ms     2 ms  192.168.0.1
  2    35 ms    36 ms    36 ms  lo0-plusnet.pcl-ag01.plus.net [195.166.128.27]
  3    37 ms    48 ms    38 ms  gi1-2-803.pcl-gw1.plus.net [84.92.5.57]
  4    38 ms    38 ms    41 ms  vl63.pcl-lb01.plus.net [212.159.2.252]
  5    57 ms    45 ms    39 ms  pth-cdns02.plus.net [212.159.13.50]
Trace complete.
C:\Users\Adam Streather>tracert 212.159.6.9
Tracing route to ptn-cdns01.plus.net [212.159.6.9]
over a maximum of 30 hops:
  1     1 ms     1 ms     2 ms  192.168.0.1
  2    40 ms    40 ms    43 ms  lo0-plusnet.pcl-ag01.plus.net [195.166.128.27]
  3    39 ms    41 ms    44 ms  gi1-2-803.pcl-gw1.plus.net [84.92.5.57]
  4    49 ms    55 ms    64 ms  vl63.pcl-lb01.plus.net [212.159.2.252]
  5    40 ms    42 ms    39 ms  ptn-cdns01.plus.net [212.159.6.9]
Trace complete.
C:\Users\Adam Streather>tracert 212.159.6.10
Tracing route to ptn-cdns02.plus.net [212.159.6.10]
over a maximum of 30 hops:
  1     1 ms     1 ms    <1 ms  192.168.0.1
  2   382 ms    66 ms    36 ms  lo0-plusnet.pcl-ag01.plus.net [195.166.128.27]
  3    47 ms    57 ms    70 ms  gi1-2-803.pcl-gw1.plus.net [84.92.5.57]
  4    45 ms    34 ms    36 ms  vl63.pcl-lb01.plus.net [212.159.2.252]
  5    32 ms    36 ms    33 ms  ptn-cdns02.plus.net [212.159.6.10]
Trace complete.
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Community Gaffer
Community Gaffer
Posts: 14,569
Thanks: 2,182
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Registered: ‎04-04-2007

Re: DNS weirdness

Quote from: djadamuk
Still no update on the service status which was due at 13:00 today.

Will update it now, judging by the lack of noise this evening it looks like we might have fixed the main cause of the problems.

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

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Newbie
Posts: 9
Registered: ‎08-07-2009

Re: DNS weirdness

Quote from: Bob
Quote from: djadamuk
Still no update on the service status which was due at 13:00 today.

Will update it now, judging by the lack of noise this evening it looks like we might have fixed the main cause of the problems.

Yeah as I say, i've had no problems. But I'll try not to speak too soon. Thanks Bob and the team!
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Grafter
Posts: 101
Thanks: 7
Registered: ‎04-02-2008

Re: DNS weirdness

Quote from: Bob
Will update it now, judging by the lack of noise this evening it looks like we might have fixed the main cause of the problems.

Thanks Bob.  No problems tonight. 
FYI Here is a copy of my DNS traceroute. 
C:\Documents and Settings\Mike>tracert 212.159.6.9
Tracing route to ptn-cdns01.plus.net [212.159.6.9]
over a maximum of 30 hops:
  1    1 ms    1 ms    <1 ms  192.168.0.1
  2    46 ms    39 ms    41 ms  lo0-plusnet.pcl-ag01.plus.net [195.166.128.27]
  3    39 ms    38 ms    39 ms  gi1-2-803.pcl-gw1.plus.net [84.92.5.57]
  4    40 ms    38 ms    38 ms  vl63.pcl-lb01.plus.net [212.159.2.252]
  5    41 ms    40 ms    45 ms  ptn-cdns01.plus.net [212.159.6.9]
Trace complete.
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Newbie
Posts: 5
Registered: ‎09-07-2009

Re: DNS weirdness

Apologies - i'm not technical and don't understand 95% of what's been posted here.  I do, however, appear to have the sort of problems that have been discussed i.e. i can't access a number of websites.  I first reported this problem on Tuesday, since when you have run a 'dial test' (is that the right term? - i had to switch my router off overnight) and also got me to send copies of 'tracert' results.  I have also been asked to change the DNS addresses for my router.
So far, none of this has had any effect.  Following this evening's post that the problem may be cleared up i've tried the websites i've been having problems with but i still can't access them.
So - please don't give up trying to sort this out just yet!
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Community Veteran
Posts: 26,786
Thanks: 989
Fixes: 10
Registered: ‎10-04-2007

Re: DNS weirdness

Have you flushed your DNS cache?
Start, Run and enter "Cmd" and click OK
In the command box enter
ipconfig /flushdns
jelv (a.k.a Spoon Whittler)
   Why I have left Plusnet (warning: long post!)   
Broadband: Andrews & Arnold Home::1 (FTTC 80/20)
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Newbie
Posts: 5
Registered: ‎09-07-2009

Re: DNS weirdness

jelv - thanks for the tip but i've just tried that and it's had no effect.  Anyone got any other ideas?  One of the sites i can't access is my daughter's Uni (www.bristol.ac.uk) - i'm supposed to be checking for emails about her choice of courses for next year.  At this rate she'll end up with the courses no one else wants to do!
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Grafter
Posts: 133
Thanks: 3
Registered: ‎06-07-2007

Re: DNS weirdness

My friend who is on a business account is also experiencing network time-outs . He can't even visit our own websites. He is seriously considering moving to another provider now because the service is laughable and for the money paid he is getting a bad service.
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Rising Star
Posts: 208
Thanks: 10
Registered: ‎12-06-2007

Re: DNS weirdness

Had a problem-free day yesterday, but this morning is terrible!
3 tries to collect my mail, several tries to get the Beeb. Tracert:
Tracing route to portal.plus.net [212.159.8.2]
over a maximum of 30 hops:
  1     1 ms     1 ms     1 ms  192.168.0.1
  2    23 ms    24 ms    24 ms  lo0-plusnet.thn-ag3.plus.net [195.166.128.80]
  3     *     2107 ms    24 ms  vl303.thn-gw1.plus.net [84.92.3.177]
  4    23 ms    23 ms    23 ms  ae0-102.ptn-gw01.plus.net [212.159.1.53]
  5    24 ms    25 ms    25 ms  gi0-1-31.ptc-gw1.plus.net [195.166.129.3]
  6    30 ms    32 ms    32 ms  pos1-0.pih-cr1.plus.net [195.166.129.250]
  7    52 ms     *       32 ms  vlan7.pih-gw3.plus.net [212.159.0.26]
  8    92 ms    40 ms    34 ms  if25.pih-lb04.plus.net [212.159.0.18]
  9    33 ms    31 ms    31 ms  portal.plus.net [212.159.8.2]
Trace complete.
Any ideas? Outlook just failed to connect to your servers again for e-mail!
Just re-booted the router, seems to be OK now
Tracing route to portal.plus.net [212.159.9.2]
over a maximum of 30 hops:
  1    10 ms    8 ms    2 ms  192.168.0.1
  2    24 ms    26 ms    24 ms  lo0-plusnet.pcl-ag03.plus.net [195.166.128.109]
  3    24 ms    25 ms    23 ms  gi1-6-703.pcl-gw01.plus.net [84.92.0.181]
  4    24 ms    23 ms    23 ms  te2-2.pte-gw1.plus.net [212.159.0.186]
  5    24 ms    27 ms    24 ms  te2-4.pte-gw2.plus.net [212.159.1.102]
  6    29 ms    31 ms    30 ms  92.core.plus.net [212.159.1.92]
  7  122 ms    29 ms    31 ms  fhw-lb04.plus.net [212.159.1.146]
  8  532 ms    46 ms    29 ms  portal.plus.net [212.159.9.2]
Trace complete.
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Newbie
Posts: 5
Registered: ‎09-07-2009

Re: DNS weirdness

Not sure whether this is helpful or not but here's the results of tracert for one of the sites i can't access

Tracing route to www.bristol.ac.uk [137.222.10.246]
over a maximum of 30 hops:
  1    2 ms    2 ms    2 ms  192.168.2.1
  2    14 ms    4 ms    3 ms  voyager.home [192.168.1.1]
  3    27 ms    28 ms    28 ms  lo0-plusnet.ptn-ag2.plus.net [195.166.128.53]
  4    27 ms    26 ms    26 ms  gi2-2-204.ptn-gw02.plus.net [84.92.3.93]
  5    30 ms    26 ms    31 ms  linx-gw2.ja.net [195.66.226.15]
  6    25 ms    26 ms    26 ms  so-3-2-0.lond-sbr3.ja.net [146.97.35.241]
  7    29 ms    24 ms    26 ms  so-6-0-0.read-sbr1.ja.net [146.97.33.165]
  8    35 ms    28 ms    27 ms  so-1-2-0.bris-sbr1.ja.net [146.97.33.105]
  9    42 ms    29 ms    45 ms  SWERN-B1.site.ja.net [146.97.41.226]
10    29 ms    27 ms    27 ms  4948-c-clif-ph.swern.net.uk [194.83.94.213]
11    35 ms    28 ms    48 ms  ub-gw-2-4948-c.swern.net.uk [194.82.125.158]
12    *        *        *    Request timed out.
13    29 ms    28 ms    28 ms  www.bristol.ac.uk [137.222.10.246]
Trace complete.
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All Star
Posts: 1,005
Thanks: 167
Fixes: 26
Registered: ‎18-10-2008

Re: DNS weirdness

fwiw, I also had intermittent trouble reaching certain (not all) websites this morning.  eg. bbc.co.uk
So I reset my PPP connection an hour ago.
I was using Juniper 1 gateway for past couple of days with no real issues until this morning.
DNS seemed to be going thru the PTN load balancer
Now on Juniper 10
All seems okay now.
DNS seems to be going thru the PCL load balancer. (I understsand it is now fixed as of yesterday)
fwiw, my web browser has no trouble loading  www.bristol.ac.uk [137.222.10.246] homepage.


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Community Gaffer
Community Gaffer
Posts: 14,569
Thanks: 2,182
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Registered: ‎04-04-2007

Re: DNS weirdness

Quote from: spacecowboy
Not sure whether this is helpful or not but here's the results of tracert for one of the sites i can't access

That's no different to a trace from my machine and I *can* access the site:
C:\Users\Bobby>tracert www.bristol.ac.uk
Tracing route to www.bristol.ac.uk [137.222.10.246]
over a maximum of 30 hops:
  1    2 ms    1 ms    3 ms  home.gateway [192.168.1.254]
  2    28 ms    29 ms    31 ms  lo0.plusnet.thn-ag2.plus.net [195.166.128.93]
  3    27 ms    28 ms    29 ms  vl604.thn-gw1.plus.net [84.92.4.169]
  4    27 ms    29 ms    28 ms  ae0-102.ptn-gw01.plus.net [212.159.1.53]
  5    27 ms    28 ms    28 ms  vl32.ptn-gw02.plus.net [195.166.129.12]
  6    27 ms    28 ms    28 ms  linx-gw2.ja.net [195.66.226.15]
  7    26 ms    29 ms    30 ms  so-0-1-0.lond-sbr3.ja.net [146.97.35.249]
  8    31 ms    31 ms    29 ms  so-6-0-0.read-sbr1.ja.net [146.97.33.165]
  9    34 ms    30 ms    31 ms  so-1-2-0.bris-sbr1.ja.net [146.97.33.105]
10    30 ms    34 ms    29 ms  SWERN-B1.site.ja.net [146.97.41.226]
11    31 ms    35 ms    31 ms  4948-c-clif-ph.swern.net.uk [194.83.94.213]
12    30 ms    31 ms    33 ms  ub-gw-2-4948-c.swern.net.uk [194.82.125.226]
13    *        *        *    Request timed out.
14    34 ms    30 ms    31 ms  www.bristol.ac.uk [137.222.10.246]
Trace complete.

Is the problem intermittent is this site always inaccessible? If it's always inaccessible then I doubt it's anything to do with the intermittent DNS issues we were seeing. You might want to look at tweaking your MTU/RWIN settings as that can sometimes prevent you accessing some sites.
Quote from: moemoff
My friend who is on a business account is also experiencing network time-outs . He can't even visit our own websites. He is seriously considering moving to another provider now because the service is laughable and for the money paid he is getting a bad service.

Again, is the problem consistent or intermittent?

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

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Newbie
Posts: 5
Registered: ‎09-07-2009

Re: DNS weirdness

Quote from: Bob

That's no different to a trace from my machine and I *can* access the site:
..
Is the problem intermittent is this site always inaccessible? If it's always inaccessible then I doubt it's anything to do with the intermittent DNS issues we were seeing. You might want to look at tweaking your MTU/RWIN settings as that can sometimes prevent you accessing some sites.


It's intermittent in the sense that i can sometimes (maybe 1 out of 5 tries) get a version of the homepage to load but it's unformatted and has no graphics at all.
This problem started about a week or so ago - up till then we'd had no problems
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Newbie
Posts: 5
Registered: ‎09-07-2009

Re: DNS weirdness

P.S.  Here are some of the other sites i can't access -
www.meldexinternational.com
www.picturecraftgallery.com
www.westcliffegallery.com
Is it safe for a non-techie like me to play with MTU/RWIN settings?  If so, would you suggest any particular settings to try?
Thanks for help in trying to resolve what's becoming a rather annoying issue.