cancel
Showing results for 
Search instead for 
Did you mean: 

DNS weirdness

Highlighted
Dabbler
Posts: 18
Registered: ‎07-07-2007

Re: DNS weirdness

Thanks for the update.
Highlighted
Newbie
Posts: 1
Registered: ‎08-07-2009

Re: DNS weirdness

I too am getting increasingly frequent DNS problems with metronet. The web is almost completely inaccesible today, but the problem has existed for some time, not simply since the 1st July.
It is not acceptable to advise me to specify some other DNS server because that prevents me from accessing the web via the proxy server at work.
The link that Bob posted http://usertools.plus.net/@gateway tells me:
"Records show your IP address is not that from the PlusNet brand and as such, we cannot detect your gateway. The results below may be skewed somewhat as a result.
You are currently connected to the "City Lifeline, Juniper 9" gateway. This gateway is sometimes known as pcl-ag02.
This is because it appears you are not a PlusNet Customer."
This statement is not correct, though it may well become so in the near future.
As I am paying more for this connection than I would for BT, talk-talk, Tiscali etc I expect a better service than I would get from those ISPs
Highlighted
Grafter
Posts: 235
Registered: ‎09-05-2008

Re: DNS weirdness

Quote from: Bob
Anyway, quick update...
Four of the servers at one of the sites you connect to for DNS resolution keep on failing TCP/IP heathchecks in the load balancer.

Bob
This hasn't started recently, it's been going on for weeks.  I first raised a ticket on 16th June - not that that was the start of it - it just got worse then, but I gave up with it as the responses were less than helpful.  The problem is at it worst at the busiest times of the day, mid-morning, late afternoon/early evening and again just after midnight.  I think the increased iPlayer traffic has also had a large part to play in it.
I have PuTTY running constantly, monitoring my asterisk server, and spot the problems straight away as they happen, registrations timing out or failing completely and extensions becoming lagged or unreachable, etc.
I am using 212.159.6.10 and 212.159.13.50 at the present time but have tried various combinations over the last few weeks.
Highlighted
Grafter
Posts: 133
Thanks: 1
Registered: ‎31-07-2007

Re: DNS weirdness

For me this problem as been going on for ages. It is so frustrating.
My results:
Microsoft Windows [Version 6.0.6002]
Copyright (c) 2006 Microsoft Corporation.  All rights reserved.
C:\Users\Bazza>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  192.168.1.1
  2    36 ms    34 ms    30 ms  lo0-plusnet.thn-ag3.plus.net [195.166.128.80]
  3    38 ms    30 ms    31 ms  vl303.thn-gw1.plus.net [84.92.3.177]
  4    30 ms    31 ms    29 ms  ae0-102.ptn-gw01.plus.net [212.159.1.53]
  5    31 ms    43 ms    57 ms  vl55.ptn-lb01.plus.net [212.159.2.124]
  6    30 ms    64 ms    37 ms  ptn-cdns01.plus.net [212.159.6.9]
Trace complete.
C:\Users\Bazza>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  192.168.1.1
  2    35 ms    41 ms    37 ms  lo0-plusnet.thn-ag3.plus.net [195.166.128.80]
  3    37 ms    43 ms    29 ms  vl303.thn-gw1.plus.net [84.92.3.177]
  4    47 ms    73 ms    80 ms  ae0-102.ptn-gw01.plus.net [212.159.1.53]
  5    30 ms    88 ms    36 ms  vl55.ptn-lb01.plus.net [212.159.2.124]
  6    29 ms    28 ms    29 ms  ptn-cdns02.plus.net [212.159.6.10]
Trace complete.
C:\Users\Bazza>nslookup bbc.co.uk 212.159.6.9
Server:  ptn-cdns01.plus.net
Address:  212.159.6.9
Non-authoritative answer:
Name:    bbc.co.uk
Address:  212.58.254.252

C:\Users\Bazza>nslookup bbc.co.uk 212.159.6.10
Server:  ptn-cdns02.plus.net
Address:  212.159.6.10
Non-authoritative answer:
Name:    bbc.co.uk
Address:  212.58.254.252

C:\Users\Bazza>
Highlighted
Grafter
Posts: 235
Registered: ‎09-05-2008

Re: DNS weirdness

Bazza
If your tracert's complete in a reasonable time, which they have, then this isn't a problem.
If you've got problems then usually one or two hops will be shown with  *  *  *  meaning they've timed out.
Highlighted
Grafter
Posts: 133
Thanks: 1
Registered: ‎31-07-2007

Re: DNS weirdness

Yes but I'm still getting the same problems as everybody else in this thread which suggests to me it is intermittent. I suspect if I sat here for a while repeating the test they would show up the same anomaly.
Highlighted
Newbie
Posts: 4
Registered: ‎08-07-2009

Re: DNS weirdness

Quote from: jelv
You don't have to change it in your router. Change the network settings on your PC to use the DNS servers you want.

Thanks Jelv, I've forced mine to change to a different DNS server and I seem to have most things back BUT.... when this started at the weekend, my newsreader started throwing up connection errors and that's not gone away. Is it just a coincidence?
Highlighted
Grafter
Posts: 133
Thanks: 1
Registered: ‎31-07-2007

Re: DNS weirdness

Run the tests a few more times now and getting some large timings
Tracing route to ptn-cdns01.plus.net [212.159.6.9]
over a maximum of 30 hops:
  1    <1 ms    <1 ms    <1 ms  192.168.1.1
  2    35 ms    29 ms    31 ms  lo0-plusnet.thn-ag3.plus.net [195.166.128.80]
  3    30 ms    29 ms    42 ms  vl303.thn-gw1.plus.net [84.92.3.177]
  4  131 ms  161 ms  205 ms ae0-102.ptn-gw01.plus.net [212.159.1.53]
  5    32 ms    30 ms    29 ms  vl55.ptn-lb01.plus.net [212.159.2.124]
  6    58 ms    61 ms    45 ms  ptn-cdns01.plus.net [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  192.168.1.1
  2    32 ms    46 ms    32 ms  lo0-plusnet.thn-ag3.plus.net [195.166.128.80]
  3    33 ms    30 ms    47 ms  vl303.thn-gw1.plus.net [84.92.3.177]
  4    72 ms  237 ms  173 ms  ae0-102.ptn-gw01.plus.net [212.159.1.53]
  5    36 ms    33 ms    44 ms  vl55.ptn-lb01.plus.net [212.159.2.124]
  6    32 ms    29 ms    51 ms  ptn-cdns01.plus.net [212.159.6.9]
Highlighted
Newbie
Posts: 4
Registered: ‎08-07-2009

Re: DNS weirdness

Angry Angry Angry
Ok, spoke too soon. Nothing's changed at all. My only access is via this dog-slow proxy.
Are Plusnet going to give customers a refund for this non-service?Huh
Highlighted
Grafter
Posts: 36
Registered: ‎09-06-2007

Re: DNS weirdness

These two nmap scans illustrate that there is serious latency whilst performing reverse DNS resolution for the hosts between me and the DNS servers ptn-cdns01 and ptn-cdns02 during the first scan. Note that the latency for ICMP responses is very short.
The second scan is after I dropped and reconnected the ADSL connection and shows a marked improvement in DNS resolution times (2.59s compared with 19.58s):
[tt]Completed Traceroute at 16:25, 0.08s elapsed
Initiating Parallel DNS resolution of 12 hosts. at 16:25
Completed Parallel DNS resolution of 12 hosts. at 16:26, 19.58s elapsed
DNS resolution of 6 IPs took 19.58s. Mode: Async [#: 2, DR: 1, OK: 5, NX: 0, SF: 0, RF: 0, NI: 0, NA: 0, TR: 8, TO: 16, TX: 21, CN: 0]
Host ptn-cdns01.plus.net (212.159.6.9) is up, received echo-reply (0.031s latency).
TRACEROUTE (using proto 1/icmp)
HOP RTT   ADDRESS
1   0.00  me
2   31.00 lo0-plusnet.pcl-ag02.plus.net (195.166.128.39)
3   31.00 gi1-2-904.pcl-gw02.plus.net (84.92.0.141)
4   31.00 vl63.pcl-lb01.plus.net (212.159.2.252)
5   31.00 ptn-cdns01.plus.net (212.159.6.9)
Host ptn-cdns02.plus.net (212.159.6.10) is up, received echo-reply (0.016s latency).
TRACEROUTE (using proto 1/icmp)
HOP RTT   ADDRESS
1   --    me
2   --    lo0-plusnet.pcl-ag02.plus.net (195.166.128.39)
3   --    gi1-2-904.pcl-gw02.plus.net (84.92.0.141)
4   31.00 vl63.pcl-lb01.plus.net (212.159.2.252)
5   31.00 ptn-cdns02.plus.net (212.159.6.10)
Read from C:\Program Files\Nmap: nmap-protocols.
Nmap done: 2 IP addresses (2 hosts up) scanned in 28.95 seconds
           Raw packets sent: 16 (448B) | Rcvd: 30 (1064B)[/tt]
Second scan:
[tt]Completed Traceroute at 16:28, 0.13s elapsed
Initiating Parallel DNS resolution of 12 hosts. at 16:28
Completed Parallel DNS resolution of 12 hosts. at 16:28, 2.59s elapsed
DNS resolution of 7 IPs took 2.59s. Mode: Async [#: 2, DR: 0, OK: 7, NX: 0, SF:0, RF: 0, NI: 0, NA: 0, TR: 7, TO: 2, TX: 9, CN: 0]
Host ptn-cdns01.plus.net (212.159.6.9) is up, received echo-reply (0.016s latency).
TRACEROUTE (using proto 1/icmp)
HOP RTT   ADDRESS
1   0.00  me
2   31.00 lo0.plusnet.thn-ag1.plus.net (195.166.128.101)
3   32.00 vl703.thn-gw1.plus.net (84.92.4.241)
4   32.00 ae0-102.ptn-gw01.plus.net (212.159.1.53)
5   32.00 vl55.ptn-lb01.plus.net (212.159.2.124)
6   31.00 ptn-cdns01.plus.net (212.159.6.9)
Host ptn-cdns02.plus.net (212.159.6.10) is up, received echo-reply (0.015s latency).
TRACEROUTE (using proto 1/icmp)
HOP RTT   ADDRESS
1   --    me
2   --    lo0.plusnet.thn-ag1.plus.net (195.166.128.101)
3   --    vl703.thn-gw1.plus.net (84.92.4.241)
4   --    ae0-102.ptn-gw01.plus.net (212.159.1.53)
5   --    vl55.ptn-lb01.plus.net (212.159.2.124)
6   32.00 ptn-cdns02.plus.net (212.159.6.10)
Read from C:\Program Files\Nmap: nmap-protocols.
Nmap done: 2 IP addresses (2 hosts up) scanned in 3.27 seconds
           Raw packets sent: 16 (448B) | Rcvd: 30 (1064B)[/tt]
Edited to add the command I used:
[tt]nmap -sP -PE --traceroute -d 212.159.6.9-10[/tt]
Highlighted
Rising Star
Posts: 607
Fixes: 1
Registered: ‎05-04-2007

Re: DNS weirdness

Quote from: Forest

Are Plusnet going to give customers a refund for this non-service?Huh

Or better still cancel our contracts so we can move elsewhere
Highlighted
Dabbler
Posts: 15
Registered: ‎09-09-2008

Re: DNS weirdness

I too seem to be having interminable DNS issues, I switched my default DNS server to an OpenDNS server, and the problem seems to have gone (fingers crossed)
I will monitor things here until Plusnet have sorted this service affecting issue out.
Highlighted
Grafter
Posts: 119
Registered: ‎30-07-2007

Re: DNS weirdness

Hi all
Now I'm getting these problems as well. Started about 10 mins ago, just as I darn well needed the internet as well.
Regards
Danep
Highlighted
Grafter
Posts: 133
Thanks: 1
Registered: ‎31-07-2007

Re: DNS weirdness

Just did the tests again:
Microsoft Windows [Version 6.0.6002]
Copyright (c) 2006 Microsoft Corporation.  All rights reserved.
C:\Users\Bazza>tracert 212.159.6.9
Tracing route to 212.159.6.9 over a maximum of 30 hops
  1    <1 ms    <1 ms    <1 ms  192.168.1.1
  2    30 ms    29 ms    30 ms  195.166.128.80
  3    48 ms    43 ms    32 ms  84.92.3.177
  4    33 ms    41 ms    35 ms  212.159.1.53
  5    30 ms    30 ms    37 ms  212.159.2.124
  6    38 ms    29 ms    32 ms  212.159.6.9
Trace complete.
C:\Users\Bazza>tracert 212.159.6.10
Tracing route to 212.159.6.10 over a maximum of 30 hops
  1    <1 ms    <1 ms    <1 ms  192.168.1.1
  2    43 ms    29 ms    37 ms  195.166.128.80
  3    34 ms    33 ms    37 ms  84.92.3.177
  4    35 ms    31 ms    32 ms  212.159.1.53
  5    38 ms    45 ms    32 ms  212.159.2.124
  6    33 ms    53 ms    31 ms  212.159.6.10
Trace complete.
nslookup bbc.co.uk 212.159.6.9
DNS request timed out.
    timeout was 2 seconds.
Server:  UnKnown
Address:  212.159.6.9
DNS request timed out.
    timeout was 2 seconds.
DNS request timed out.
    timeout was 2 seconds.
DNS request timed out.
    timeout was 2 seconds.
DNS request timed out.
    timeout was 2 seconds.
*** Request to UnKnown timed-out
DNS request timed out.
    timeout was 2 seconds.
nslookup bbc.co.uk 212.159.6.10
Server:  UnKnown
Address:  212.159.6.10
DNS request timed out.
    timeout was 2 seconds.
DNS request timed out.
    timeout was 2 seconds.
DNS request timed out.
    timeout was 2 seconds.
DNS request timed out.
    timeout was 2 seconds.
*** Request to UnKnown timed-out
C:\Users\Bazza>
Highlighted
Grafter
Posts: 133
Thanks: 1
Registered: ‎31-07-2007

Re: DNS weirdness

Last one:
C:\Users\Bazza>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  192.168.1.1
  2    31 ms    30 ms    31 ms  lo0.plusnet.thn-ag1.plus.net [195.166.128.101]
  3  192.168.1.1  reports: Destination net unreachable.
Trace complete.
C:\Users\Bazza>tracert 212.159.6.9
Tracing route to ptn-cdns02.plus.net [212.159.6.10]
over a maximum of 30 hops:
  1    <1 ms    <1 ms    <1 ms  192.168.1.1
  2    44 ms    30 ms    41 ms  lo0-plusnet.pcl-ag01.plus.net [195.166.128.27]
  3    40 ms    32 ms    31 ms  gi1-2-803.pcl-gw1.plus.net [84.92.5.57]
  4    42 ms    82 ms    58 ms  vl63.pcl-lb01.plus.net [212.159.2.252]
  5    30 ms    36 ms    44 ms  ptn-cdns02.plus.net [212.159.6.10]
Trace complete.
C:\Users\Bazza>nslookup bbc.co.uk 212.159.6.9
Server:  ptn-cdns01.plus.net
Address:  212.159.6.9
Non-authoritative answer:
Name:    bbc.co.uk
Address:  212.58.254.252

C:\Users\Bazza\nslookup bbc.co.uk 212.159.6.9
Server:  ptn-cdns02.plus.net
Address:  212.159.6.10
Non-authoritative answer:
Name:    bbc.co.uk
Address:  212.58.254.252

C:\Users\Bazza>