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Standard User Stanman_24
(knowledge is power) Mon 03-Jun-13 20:31:00
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Massive Latency problems


[link to this post]
 
Target Name: www.bbc.co.uk
IP: 212.58.246.91
Date/Time: 03/06/2013 20:29:47 to 03/06/2013 20:29:56

1 3 ms 3 ms 3 ms 3 ms 3 ms 3 ms 3 ms 3 ms 3 ms 3 ms home.gateway.home.gateway [192.168.1.254]
2 25 ms 131 ms 29 ms 292 ms 51 ms 16 ms 26 ms 18 ms 24 ms 18 ms lo0-central10.ptn-ag01.plus.net [195.166.128.190]
3 16 ms 15 ms 16 ms 16 ms 15 ms 31 ms 16 ms 15 ms 15 ms 16 ms link2-central10.ptn-gw02.plus.net [84.93.248.130]
4 46 ms 15 ms 15 ms 15 ms 15 ms 18 ms 15 ms 15 ms 18 ms 15 ms xe-1-2-0.ptw-cr02.plus.net [212.159.1.30]
5 16 ms 15 ms 16 ms 34 ms 19 ms 19 ms 15 ms 15 ms 15 ms 16 ms ae2.ptw-cr01.plus.net [195.166.129.4]
6 15 ms 16 ms 16 ms 16 ms 15 ms 15 ms 15 ms 15 ms 15 ms N/A kingston-gw.thdo.bbc.co.uk [212.58.239.6]
7 * * * * * * * N/A N/A N/A [-]
8 16 ms 17 ms 58 ms 53 ms 16 ms 24 ms 17 ms 16 ms 27 ms N/A ae0.er01.cwwtf.bbc.co.uk [132.185.254.93]
9 17 ms 27 ms 28 ms 17 ms 18 ms 16 ms 18 ms 18 ms 16 ms N/A [132.185.255.164]
10 16 ms 16 ms 16 ms 16 ms 16 ms 16 ms 16 ms 15 ms 16 ms N/A bbc-vip012.cwwtf.bbc.co.uk [212.58.246.91]

Ping statistics for www.bbc.co.uk
Packets: Sent = 10, Received = 10, Lost = 0 (0.0%)
Round Trip Times: Minimum = 15ms, Maximum = 16ms, Average = 15ms


lo0-central10.ptn-ag01.plus.net hitting 500ms

KRO BCFC smile

BQM

Edited by Stanman_24 (Mon 03-Jun-13 20:31:28)

Standard User Tam
(eat-sleep-adslguide) Mon 03-Jun-13 20:40:01
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Re: Massive Latency problems


[re: Stanman_24] [link to this post]
 
ahhh good.

Plusnet still have the overloaded pipe problem then where they have to disconnect users and let them reconnect on less congested connections I assume?

Tam

Powered By O2 - Sync'd at 2756 / 916 (ATTN 63dB / SNR 6dB) - LLU The entire town has FTTC except my estate! - Blooming BT!!! frown!
Standard User WWWombat
(fountain of knowledge) Mon 03-Jun-13 22:05:19
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Re: Massive Latency problems


[re: Tam] [link to this post]
 
If the pipe was overloaded/congested - in terms of throughput to/from other places - then I'd expect to see some increased ping latencies from all other places, not just PN's own edge router.

PN themselves have said that ICMP packets are treated as titanium level traffic in their traffic management nodes. I'd expect them to transit through the routers on the fastest possible speeds.

However, an ICMP ping packet targeted *at* one of the edge routers is something different - it needs to be processed and answered from within the router, rather than being transited by the router. A subtle difference.

So a delay in a packet that was targeted at the edge router might indicate that it has other processing going on, independent of "just" transit routing, and the ICMP response was delayed for those reasons.

I'd be more concerned if packets that transit the edge routers were being delayed.


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Standard User RobertoS
(sensei) Mon 03-Jun-13 22:35:19
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Re: Massive Latency problems


[re: WWWombat] [link to this post]
 
Agreed.

It is only if the step at a node is then continued to most or all of the later nodes that there is a problem.

If the particular node is (mostly) the only one with a high value that simply means it has better things to do, i.e. passing genuine traffic through, than respond to somebody pinging it. Which is why many are configured not to respond at all - the ones that time out.

Edit:-
Ping statistics for www.bbc.co.uk
Packets: Sent = 10, Received = 10, Lost = 0 (0.0%)
Round Trip Times: Minimum = 15ms, Maximum = 16ms, Average = 15ms
Looks pretty good to me.

My broadband basic info/help site - www.robertos.me.uk | Domains,website and mail hosting - Tsohost.
Connection - Plusnet UnLim Fibre (FTTC). Sync ~ 53.4/16.8Mbps @ 600m. - BQM

"Where talent is a dwarf, self-esteem is a giant." - Jean-Antoine Petit-Senn.
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Allergy information: This post was manufactured in an environment where nuts are present. It may include traces of understatement, litotes and humour.

Edited by RobertoS (Mon 03-Jun-13 22:37:10)

Standard User Stanman_24
(knowledge is power) Mon 03-Jun-13 23:13:30
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Re: Massive Latency problems


[re: RobertoS] [link to this post]
 
look at my bqm smile

KRO BCFC smile

BQM
Standard User RobertoS
(sensei) Mon 03-Jun-13 23:36:40
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Re: Massive Latency problems


[re: Stanman_24] [link to this post]
 
That's more meaningful smile. Have you tried a router disconnect t see if you get a different gateway? Also, what is being done on your connection?

Which product are you one? A "new" unlimited, or a legacy one?

My broadband basic info/help site - www.robertos.me.uk | Domains,website and mail hosting - Tsohost.
Connection - Plusnet UnLim Fibre (FTTC). Sync ~ 53.4/16.8Mbps @ 600m. - BQM

"Where talent is a dwarf, self-esteem is a giant." - Jean-Antoine Petit-Senn.
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Allergy information: This post was manufactured in an environment where nuts are present. It may include traces of understatement, litotes and humour.
Standard User Stanman_24
(knowledge is power) Mon 03-Jun-13 23:56:32
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Re: Massive Latency problems


[re: RobertoS] [link to this post]
 
unlimited

you will see i did a resync as my latency dropped about 3 ms

hopefully nothing major

KRO BCFC smile

BQM
Standard User RobertoS
(sensei) Tue 04-Jun-13 00:04:46
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Re: Massive Latency problems


[re: Stanman_24] [link to this post]
 
I did wonder where that drop in the base latency had come from smile.

On FTTC re-sync's can be so quick as not to drop the session at the ISP. If I force one I always make sure I break the connection for at least 20 seconds before starting the re-sync.

There is another reason for my doing this this as well. The PlusNet Current line speed doesn't get updated if the session isn't dropped, so the "new" BT IP Profile doesn't get reflected into it. That can cause issues on below 80 (or 40) Mbps connections.

My broadband basic info/help site - www.robertos.me.uk | Domains,website and mail hosting - Tsohost.
Connection - Plusnet UnLim Fibre (FTTC). Sync ~ 53.4/16.8Mbps @ 600m. - BQM

"Where talent is a dwarf, self-esteem is a giant." - Jean-Antoine Petit-Senn.
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Allergy information: This post was manufactured in an environment where nuts are present. It may include traces of understatement, litotes and humour.
Standard User tommy45
(knowledge is power) Tue 04-Jun-13 01:57:15
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Re: Massive Latency problems


[re: RobertoS] [link to this post]
 
A quick scan of the plusnet forums Icame accross this TBBQM in a related thread , looks like congestion setting in somewhere Not looking good
And was Plusnet Gateway ptw-ag04

Edited by tommy45 (Tue 04-Jun-13 01:58:45)

ISP Representative KellyD
(isp) Tue 04-Jun-13 09:47:16
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Re: Massive Latency problems


[re: tommy45] [link to this post]
 
From what I can see, ptn-ag01 and ptw-ag04 were looking fine last night. No significant latency or dropped packets on our monitoring.

I'll have a bit of a dig and see if I can see anything further.

Kelly Dorset
Plusnet
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The above post has been made by an ISP REPRESENTATIVE (although not necessarily the ISP being discussed in the post).
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