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[Solved] Constant extremely high ping

iciclethief
Grafter
Posts: 26
Registered: 31-07-2007

[Solved] Constant extremely high ping

Yesterday the latency on my adsl2+ connection went through the roof; my ping response to the plusnet gateway is now averaging at 632.197 ms  I've reset the router a number of times and initially the ping goes back to around 30ms, but after about 20-60 seconds it jumps back up to the high hundreds.
During testing I connected to various plusnet gateways, and the problem remains.  I've also swapped routers which has made no difference.
What could possibly cause this? Is anyone else experiencing this problem?  
11 REPLIES
jojopillo
Grafter
Posts: 9,786
Registered: 16-06-2010

Re: Constant extremely high ping

HI, my first port of call would probably be to look at tweaking the MTU/RWIN settings. A good starting point is http://www.kitz.co.uk/adsl/MTU2.htm Maybe worth a try? Smiley
Community Veteran
Posts: 26,695
Thanks: 919
Fixes: 10
Registered: 10-04-2007

Re: Constant extremely high ping

I'm wondering if there's something funny with pinging the gateways. Can you try please
ping -n 30 ntp.plus.net
Do you have a wired or wireless connection to the router?
jelv (a.k.a Spoon Whittler)
   Why I have left Plusnet (warning: long post!)   
Broadband: Andrews & Arnold Home::1 (FTTC 80/20)
Line rental: Pulse 8 Home Line Rental (£13/month)
Mobile: iD mobile (£4/month)
newlay
Dabbler
Posts: 24
Registered: 07-12-2008

Re: Constant extremely high ping

I've noticed this too today - it's making online gaming fairly difficult - my pings recently have been ~20-30ms and today are ~150ms! I'm on ADSL2+ with interleaving depth of 1 on both up and downstream:
(mtr to news.bbc.co.uk from a box wired to the modem)
Host                                                                                                  Loss%   Snt   Last   Avg  Best  Wrst StDev
1. 192.168.0.1                                                                                         0.0%   288    0.7   0.8   0.5   3.7   0.4
2. lo0-central1.pcl-ag02.plus.net                                                                      0.3%   288  101.2 122.3  47.1 546.8  32.1
3. gi1-13-211.pcl-gw01.plus.net                                                                        0.3%   288  100.6 134.8  53.3 495.3  57.6
4. te2-1.pcl-gw02.plus.net                                                                             0.7%   287  105.5 130.6  49.7 554.4  51.5
5. te2-2.thn-gw2.plus.net                                                                              0.7%   287  105.9 127.2  53.0 442.7  45.3
6. rt0.thdo.bbc.co.uk                                                                                  0.0%   287  104.3 124.0  60.8 332.1  33.7
7. 212.58.238.149                                                                                      0.3%   287  113.7 123.9  41.8 556.2  39.9
8. te12-1.hsw1.cwwtf.bbc.co.uk                                                                         0.0%   287  107.8 118.7  45.2 444.5  25.0
9. nol-vip03.cwwtf.bbc.co.uk                                                                           0.3%   287  109.4 118.2  46.4 337.2  20.6
EDIT: just noticed that OP is getting low pings when he first connects, I'm on high pings all the time despite reconnecting and resetting the modem a couple of times. I've also had the same results using the modem's built-in ping function, and on a couple of other computers.
jojopillo
Grafter
Posts: 9,786
Registered: 16-06-2010

Re: Constant extremely high ping

HI newlay,
I've just been having a look at that for you. There's a few things to take into account. It seems that there may be latency issues during the world cup, as per... http://status.aaisp.net.uk/?incident=284
From your results I have seen you're connecting through pcl-ag02 and yesterday we lost 2 pipes and part of pcl-ag02 so this may have caused some congestion when the others had to cope with all the traffic. If you reconnect your router and try to get to a different gateway I'd be interested to see the results then. Instead of having to do a traceroute to see what gateway you are connected to you can use this tool http://usertools.plus.net/@gateway
Hope that helps
Jojo Smiley
iciclethief
Grafter
Posts: 26
Registered: 31-07-2007

Re: Constant extremely high ping

Thanks for the suggestions.
I am wired to the router. We've a number of devices around the house, a few Windows 7 machines, 2 X-Boxes and a Mac.  I've disabled wireless and had only my computer attached to the router, but it makes no difference.
Here is my ping (to ntp.plus.net) after a router reset:

64 bytes from 212.159.13.49: icmp_seq=25 ttl=251 time=30.965 ms
64 bytes from 212.159.13.49: icmp_seq=26 ttl=251 time=31.075 ms
64 bytes from 212.159.13.49: icmp_seq=27 ttl=251 time=30.447 ms
64 bytes from 212.159.13.49: icmp_seq=28 ttl=251 time=32.258 ms
64 bytes from 212.159.13.49: icmp_seq=29 ttl=251 time=31.047 ms
64 bytes from 212.159.13.49: icmp_seq=30 ttl=251 time=49.774 ms
64 bytes from 212.159.13.49: icmp_seq=31 ttl=251 time=30.174 ms
64 bytes from 212.159.13.49: icmp_seq=32 ttl=251 time=31.490 ms
64 bytes from 212.159.13.49: icmp_seq=33 ttl=251 time=30.573 ms
64 bytes from 212.159.13.49: icmp_seq=34 ttl=251 time=31.305 ms
64 bytes from 212.159.13.49: icmp_seq=35 ttl=251 time=42.684 ms
Request timeout for icmp_seq 36
64 bytes from 212.159.13.49: icmp_seq=37 ttl=251 time=760.160 ms
Request timeout for icmp_seq 38
64 bytes from 212.159.13.49: icmp_seq=39 ttl=251 time=160.725 ms
64 bytes from 212.159.13.49: icmp_seq=40 ttl=251 time=156.788 ms
64 bytes from 212.159.13.49: icmp_seq=41 ttl=251 time=233.254 ms
64 bytes from 212.159.13.49: icmp_seq=42 ttl=251 time=296.891 ms
64 bytes from 212.159.13.49: icmp_seq=43 ttl=251 time=385.146 ms
64 bytes from 212.159.13.49: icmp_seq=44 ttl=251 time=411.264 ms
64 bytes from 212.159.13.49: icmp_seq=45 ttl=251 time=458.889 ms
64 bytes from 212.159.13.49: icmp_seq=46 ttl=251 time=484.793 ms
64 bytes from 212.159.13.49: icmp_seq=47 ttl=251 time=598.194 ms
64 bytes from 212.159.13.49: icmp_seq=48 ttl=251 time=582.979 ms
64 bytes from 212.159.13.49: icmp_seq=49 ttl=251 time=584.284 ms
64 bytes from 212.159.13.49: icmp_seq=50 ttl=251 time=650.386 ms
64 bytes from 212.159.13.49: icmp_seq=51 ttl=251 time=657.832 ms
64 bytes from 212.159.13.49: icmp_seq=52 ttl=251 time=682.315 ms
64 bytes from 212.159.13.49: icmp_seq=53 ttl=251 time=730.021 ms
64 bytes from 212.159.13.49: icmp_seq=54 ttl=251 time=736.140 ms

And then it stays around this value.
I've tried experimenting with various MTU sizes and it makes no noticeable difference.
I logged a support call yesterday, but as yet, I've heard nothing back.
Any help would be much appreciated.
iciclethief
Grafter
Posts: 26
Registered: 31-07-2007

Re: [Solved] Constant extremely high ping

You're not going to believe this, I hardly do myself, but I've proved beyond doubt that it's Mac OS X recent update to the mail client that is causing this!  When Mac mail 4.3 is running (I usually always leave mail running), the high latency behaviour is experienced, but when I quit, pings are back around 30ms.
Thanks for your help,
Right, now to download Mozilla Thunderbird...
newlay
Dabbler
Posts: 24
Registered: 07-12-2008

Re: [Solved] Constant extremely high ping

Mine's solved too - ended up on pcl-ag04 and pings are back in the 15-30ms region...
Only flaw is that the frequent reconnections are going to hamper my efforts to persuade the DLM to get me back to 6dB SNRM...
jojopillo
Grafter
Posts: 9,786
Registered: 16-06-2010

Re: [Solved] Constant extremely high ping

@iciclethief,
That's very interesting, I shall keep a look out for other instances.
@newlay,
Looks like it was the gateway after all.
Jojo Smiley
newlay
Dabbler
Posts: 24
Registered: 07-12-2008

Re: [Solved] Constant extremely high ping

Not sure if I should be responding to a topic that now says 'solved' but I'll try anyway, and make a new one if I hear nothing!
Pings seem to be back up. I was connected to pcl-ag02 so reconnected and hit pcl-ag04. They're still high. Are there still problems at the gateway end?
thanks
Danplusnet
Grafter
Posts: 147
Registered: 29-05-2010

Re: [Solved] Constant extremely high ping

Just to add my experience, if it helps.
I have just moved over to adsl2+ and when I re-sync my router my pings go nuts (around 200-300 ms). If left connected overnight they then come back down to normal 20ms odd. No idea why this happens but it does.
jojopillo
Grafter
Posts: 9,786
Registered: 16-06-2010

Re: [Solved] Constant extremely high ping

Hi newlay,
We don't have any current issues with the gateways. I suggest you raise a fault ticket if you continue to experience these high ping times.
Jojo Smiley