Bad ping and packet loss

Forums › Spark New Zealand (including Skinny and BigPipe) › Bad ping and packet loss

Steevzy

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#142614 18-Mar-2014 19:13

Hey,
So over the last two weeks or so, my ping has increased quite alot.
This is a picture of my speedtest around 2 months ago. (Was the same speed up until a few weeks ago).

This is what i get now to the exact same server:

I rang up telecom and told them about this issue. I spoke to one of the High Priority Tech Support, and they said they would send me a new router and it should fix the issue. This did not work.
My friend told me to do a winMTR and this was the result.

Can someone tell me why there is such high ping values and packet loss.

I have Telecom VDSL 2 500g plan.
I live in Christchurch

Thanks

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#1008320 18-Mar-2014 19:13

Hello... Our robot found some keywords in your post, so here is an automated reply with some important things to note regarding broadband speeds.

If you are posting regarding DSL speeds please check that

- you have reset your modem and router

- your PC (or other PCs in your LAN) is not downloading large files when you are testing

- you are not being throttled by your ISP due to going over the monthly cap

- your tests are always done on an ethernet connection to the router - do not use wireless for testing

- you read this topic and follow the instructions there.

Make sure you provide information for other users to help you. If you have not already done it, please EDIT your post and add this now:

- Your ISP and plan

- Type of connection (ADSL, ADSL2, VDSL)

- Your modem DSL stats (do not worry about posting Speedtest, we need sync rate, attenuation and noise margin)

- Your general location (or street)

- If you are rural or urban

- If you know your connection is to an exchange, cabinet or conklin

- If your connection is to a ULL or wholesale service

- If you have done an isolation test as per the link above

Most of the problems with speed are likely to be related to internal wiring issues. Read this discussion to find out more about this. Your ISP is not intentionally slowing you down today (unless you are on a managed plan). Also if this is the school holidays it's likely you will notice slower than usual speed due to more users online.

A master splitter is required for VDSL2 and in most cases will improve speeds on DSL connections. Regular disconnections can be a monitored alarm or a set top box trying to connect. If there's an alarm connected to your line even if you don't have an alarm contract it may still try to connect so it's worth checking.

I recommend you read these two blog posts:

- Is your premises phone wiring impacting your broadband performance? (very technical)

- Are you receiving a substandard ULL ADSL2+ connection from your ISP?

I am the Geekzone Robot and I am here to help. I am from the Internet. I do not interact. Do not expect other replies from me.

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plambrechtsen

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#1008359 18-Mar-2014 19:37

ICMP ping is commonly de-priororitisied. So it is never an accurate to use.

What does a tcp traceroute give you?

Steevzy

10 posts

Wannabe Geek

#1008369 18-Mar-2014 19:55

Im not sure what/how to do a tracerout.
Can you link me?

l43a2

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#1008371 18-Mar-2014 20:03

could be caused by a DLM profile change more people in your area getting VDSL causing cross talk, could be testing over wireless :P

Steevzy

10 posts

Wannabe Geek

#1008382 18-Mar-2014 20:32

wiredgives me the same connection, but like, plus 5 more down load. ping is still the same

sbiddle

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#1008454 18-Mar-2014 21:37

That table isn't showing anything wrong.

I would assume that over Ethernet however that the "worst" figure drops on the first hop when you eliminate wireless and the overall reduction in sync speed is likely just crosstalk and/or DLM settling your line down.

Steevzy

10 posts

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#1009258 19-Mar-2014 19:11

oh ok. Ill have to try look around for a better ISP, as tech support say that they can't change the DLM settings back to what it was.
Thanks for the help

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sbiddle

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#1009310 19-Mar-2014 20:02

Steevzy: oh ok. Ill have to try look around for a better ISP, as tech support say that they can't change the DLM settings back to what it was.
Thanks for the help

That's right, they can't. DLM is software that automatically sets your VDSL profile to what the software believes will give you the most stable connection.

Changing ISP's may make you feel good but it's not going to change anything. Crosstalk is a very real issue in the VDSL world.

hio77

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#1009315 19-Mar-2014 20:07

Steevzy: oh ok. Ill have to try look around for a better ISP, as tech support say that they can't change the DLM settings back to what it was.
Thanks for the help

no ISP can control DLM.

DLM is there for a reason, and so controlling it would break that.

99% of the time, your internal wiring, or usage habbits (eg turning the modem off often/resyncing too much) is to blame for not being on a DLM-1 profile (1ms)

you can have DLM reset, which is likely to get you back down faster, but if a linefault, or crosstalk is to blame for loosing DLM in the first place, it will be moot.

DLM will keep trying overtime to get your profile right, so it is possible you will end up with DLM-1 back again at some point.

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Steevzy

10 posts

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#1009323 19-Mar-2014 20:19

but they must have changed something for my ping to go from 5 to 21. And sometimes even 50

hio77

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#1009326 19-Mar-2014 20:23

Steevzy: but they must have changed something for my ping to go from 5 to 21. And sometimes even 50

5 to 21.

that sounds exactly like the increase from DLM-1 to an 8ms profile (8ms added each way, at best your seeing 14ms added to everything.) which give or take sounds about right.

as for your spikes up to 50? is this while the connection is being used possibly? how about only at certain times of the day?

first off, find out what DLM profile you are on forsure - your modem stats should be able to help you there.

secondly, look at when your pings are going up, maybe you do have an issue, or maybe its simply your own usage.

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sbiddle

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#1009328 19-Mar-2014 20:27

Steevzy: but they must have changed something for my ping to go from 5 to 21. And sometimes even 50

DLM changes latency to by introducing 8ms or 16ms interleaving which is for all intent purposes error correction on the line.

I'm still yet to see anything you've post that indicates an issue with your connection. Maybe if you posted the above graph done on Ethernet and it's still showing spikes in latency then I might believe it, but when performed over wireless it only takes congestion on the WiFi PHY layer to introduce a spike on the first hop and everything else is affected, which is exactly what is happening. The final figure is really all that matters, and 0 packet loss with 63ms best and 65ms avg shows a good connection.

Steevzy

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Wannabe Geek

#1009340 19-Mar-2014 20:43

I am a professional gamer and i do not find a 65ms avg to be good connection?
Considering it used to be 5

sbiddle

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#1009344 19-Mar-2014 20:46

65ms is to a server in Sydney, it could never have been 5ms.

Before the DLM change you would have likely been seeing ~51ms to Sydney and you've now got an extra 14ms RTT with the 8ms interleaving.

Your traffic also has to get from Christchurch to Auckland before it can travel to Sydney.

Steevzy

10 posts

Wannabe Geek

#1009379 19-Mar-2014 21:32

I used to have 5ms ping to Christchurch..................... Now it is above 22 all the time.
Never mentioned Sydney

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