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Weird network problem. Tiny lags, connection drops and latency spikes. Is VM a culprit?

Hi all, 

I think of myself as a fairly techy guy but for the life of me can't solve this problem. Apologies if I provide too much detail here or break any rules, but I'm that desperate for a solution. 

The problem is this: 

I have been experiencing a strange lag when web browsing and sometimes momentary drops in internet connection (as in pages loading etc, not WiFi connection dropping) for months. This is most noticeable when my wife is working using a Citrix virtual desktop which logs her out every time this happens. Video conferencing and online gaming also suffer from these momentary blips. A traceroute shows multiple latency spikes and large packet loss drops (often 100%) for short periods throughout the day (although I don't really know what I'm looking at). Today between 2 and 3PM has been the worst.

The environment is: 

A small, three-bedroom, three floor house which has been extended (plenty of metal supports in fairly thin walls). 

ISP is Virgin Media Fibre on their fastest package (about 375Mbps down, 36.7Mbps up). SuperHub 3 is in Router mode connected to a TP-Link AC5400 MU-MIMO Tri-Band Gaming Router with a Netgear Nighthawk EX7700 Mesh Extender on the second floor to boost the signal (have also tried Google Wi-Fi and Netgear Orbi with three Satellites around the house). 

House is very IoT heavy (around 25 or so devices) and includes:

Nest Thermostat 
Sonos speakers in most rooms
3x Wi-Fi-enabled TVs
Phillips Hue hub connected to router with bulbs in most rooms 
Ring Doorbell 
Fire TVs and AppleTVs

Multiple Alexa devices 

Misc. connected fans etc

Other devices include MacBook Pro, MacBook Air, iMac, 2x iPads, 2x iPhones, PS4, Nintendo Switch, 2x Virgin Media set top boxes. 

Almost everything is connected to either 2.5GHz or 5.GHz wireless network with the same name.

Things I've tried:

Replacing routers and satellites (as above) – No change
Various router tweaks (turning off and on management features etc)
Moving Wi-Fi to least congested channels 
Using different range extenders
Pinging Google.com to follow the trace route – seems to point to an internal issue and shows random latency spikes/100% packet loss at different intervals (see image)

Set up a Broadband Quality Monitor via Think Broadband (nothing seems too bad there)

Shifting all IoT devices to the 2.4GHz network

 

My initial thoughts: 

I've provided all the detail above in the vain hope that someone will say "Oh yeah, I had XYZ piece of kit and it did the same to me" but my fear is it's more complex than that. The number of devices fighting for bandwidth/signal seems to be one of the more likely culprits but I'm still not convinced that some of the ISPs wiring isn't at fault. They've been out to fix the connection to the house several times and tried various boosters, new cables, splitters etc that may have caused a problem. On the whole, the internet is fine (although range can sometimes be a problem in the farther reaches of the house) but it's these small microdisconects that I want to try to kill and would love someone to help me with. I'm happy to share anything that may be of use or run any kind of diagnostics required as I've run out of ideas. 


Thanks in advance for your help. 

Ben

Screenshot 2020-08-26 at 14.58.07.png

 

 

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Alessandro Volta
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Message 2 of 13
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Re: Weird network problem. Tiny lags, connection drops and latency spikes. Is VM a culprit?

It can be difficult diagnosing problems without some basic information.

Have you checked the 'Check Service Status' at the top of the page ?

If nothing is showing try phoning 0800 561 0061, this will tell you of more local issues that may be affecting the area. Be aware that it isn't a manned line.

Go round all the accessible co-ax connections and ensure that they are finger tight.

If everything above is OK we need do some troubleshooting; to start with …

 

Can you set up a Broadband Quality Monitor (BQM) at thinkbroadband.com - this will give you an insight into what is happening with the signal at the other side of the Hub, it will take a few hours to get any kind of trend showing although you should post the link straight away.

Post a link to your BQM on here.

Instructions for posting BQM Link

Under your BQM graph are two links in red.

Click the lower link (Share Live Graph) then click generate.

Copy the text in the Direct Link box, beware, there may be more text than you can see.

On here click the Link icon (2 links chain to the left of the camera icon)

In the URL box paste the link you copied and in the ‘text to display’ box write My BQM then click OK - you can post the link straight away.

Then

 

Can you please

Type 192.168.0.1 (192.168.100.1 in Modem mode) into your browser URL bar and press enter. 

When the page appears DO NOT LOG IN but click ‘Check Router Status’.

Copy and paste the contents of the Downstream, Upstream and Network Log tabs onto here, if you get a yellow warning click the Post button again.

A Guru will be along soon to decipher the info.


*********************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************
BT Smart Hub 2 with 70Mbs Download,18Mbs Upload, 9.17ms Latency & 0.35ms Jitter.
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Message 3 of 13
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Re: Weird network problem. Tiny lags, connection drops and latency spikes. Is VM a culprit?

Hi Mike, 

Thanks for your reply.

 

I will upload the information in individual posts now. I've been down this route before but hopefully there'll be something new to glean from this information. I'll also upload a more recent traceroute graph to show some severe periods of connection loss today. Although, as I said in my original post, this could well be an issue within my network rather than a VM issue. 

My BQM is here

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Re: Weird network problem. Tiny lags, connection drops and latency spikes. Is VM a culprit?

Downstream bonded channels

Channel Frequency (Hz) Power (dBmV) SNR (dB) Modulation Channel ID

1

202750000

3.9

38

256 qam

9

2

210750000

3.7

38

256 qam

10

3

218750000

3.5

38

256 qam

11

4

226750000

3.5

38

256 qam

12

5

234750000

3.2

38

256 qam

13

6

242750000

2.5

38

256 qam

14

7

250750000

2.7

38

256 qam

15

8

258750000

3.2

38

256 qam

16

9

266750000

3.4

38

256 qam

17

10

274750000

3.5

38

256 qam

18

11

282750000

3.7

38

256 qam

19

12

290750000

3.9

38

256 qam

20

13

298750000

3.7

38

256 qam

21

14

306750000

3.2

38

256 qam

22

15

314750000

3.7

38

256 qam

23

16

322750000

3.9

38

256 qam

24

17

330750000

4

38

256 qam

25

18

370750000

2.9

38

256 qam

26

19

378750000

3

38

256 qam

27

20

386750000

3.7

38

256 qam

28

21

394750000

3.9

38

256 qam

29

22

402750000

4

38

256 qam

30

23

410750000

3.9

38

256 qam

31

24

418750000

4

38

256 qam

32

 

 

Downstream bonded channels

Channel

Locked Status

RxMER (dB)

Pre RS Errors

Post RS Errors

1

Locked

38.6

242557

272757

2

Locked

38.9

252311

267606

3

Locked

38.6

261058

265455

4

Locked

38.6

240909

268090

5

Locked

38.9

242869

271588

6

Locked

38.9

277283

266806

7

Locked

38.6

294148

256972

8

Locked

38.9

195905

256091

9

Locked

38.9

197959

265157

10

Locked

38.9

214807

271628

11

Locked

38.9

220194

268795

12

Locked

38.6

203704

253890

13

Locked

38.9

191023

251494

14

Locked

38.9

179436

246662

15

Locked

38.9

165820

244395

16

Locked

38.9

150745

233293

17

Locked

38.9

134794

229764

18

Locked

38.6

153566

237077

19

Locked

38.6

149019

234861

20

Locked

38.6

145743

228491

21

Locked

38.9

151626

235359

22

Locked

38.9

164688

238691

23

Locked

38.6

175692

240440

24

Locked

38.9

162764

232286

 

Upstream bonded channels

Channel

Frequency (Hz)

Power (dBmV)

Symbol Rate (ksps)

Modulation

Channel ID

1

53700000

4.8

5120

64 qam

2

2

46199942

4.75

5120

64 qam

3

3

39399961

4.775

5120

64 qam

4

4

32600034

4.8

5120

64 qam

5

 

Upstream bonded channels

Channel

Channel Type

T1 Timeouts

T2 Timeouts

T3 Timeouts

T4 Timeouts

1

ATDMA

0

0

0

0

2

ATDMA

0

0

0

0

3

ATDMA

0

0

0

0

4

ATDMA

0

0

0

0

 

Network Log

Time

Priority

Description

26/08/2020 17:39:45

Warning!

LAN login FAILED : Incorrect Username / Password / ConnectionType;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;

26/08/2020 10:26:18

Error

DHCP RENEW sent - No response for IPv4;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;

26/08/2020 04:44:13

critical

No Ranging Response received - T3 time-out;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;

26/08/2020 02:33:48

Error

DHCP RENEW sent - No response for IPv4;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;

25/08/2020 11:13:18

critical

No Ranging Response received - T3 time-out;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;

25/08/2020 10:48:48

Error

DHCP RENEW sent - No response for IPv4;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;

24/08/2020 02:08:4

Warning!

RCS Partial Service;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;

24/08/2020 02:08:4

critical

SYNC Timing Synchronization failure - Loss of Sync;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;

24/08/2020 02:07:58

Warning!

RCS Partial Service;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;

24/08/2020 02:07:57

critical

SYNC Timing Synchronization failure - Loss of Sync;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;

24/08/2020 02:07:53

Warning!

RCS Partial Service;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;

24/08/2020 02:07:53

critical

SYNC Timing Synchronization failure - Loss of Sync;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;

24/08/2020 02:07:14

Warning!

RCS Partial Service;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;

24/08/2020 02:07:11

critical

SYNC Timing Synchronization failure - Loss of Sync;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;

24/08/2020 02:07:6

Warning!

RCS Partial Service;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;

24/08/2020 02:07:5

critical

SYNC Timing Synchronization failure - Loss of Sync;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;

24/08/2020 02:07:3

Warning!

RCS Partial Service;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;

24/08/2020 02:07:3

critical

SYNC Timing Synchronization failure - Loss of Sync;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;

24/08/2020 02:07:1

Warning!

RCS Partial Service;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;

24/08/2020 02:06:59

critical

SYNC Timing Synchronization failure - Loss of Sync;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;

 

 

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Re: Weird network problem. Tiny lags, connection drops and latency spikes. Is VM a culprit?

Screenshot 2020-08-26 at 17.41.52.png

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Re: Weird network problem. Tiny lags, connection drops and latency spikes. Is VM a culprit?

Hi benharvell,

 

Thank you for your post and welcome to the community. 

 

I'm very sorry to hear about the issue you're having. 

 

What I will do is private message you so we can look into this. 

 

^Martin

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Re: Weird network problem. Tiny lags, connection drops and latency spikes. Is VM a culprit?

Please post a resolution here. We are all having the same issue. thanks

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Re: Weird network problem. Tiny lags, connection drops and latency spikes. Is VM a culprit?

Hi tommygun75,

 

Once we have an answer for this we will post it publicly. 

 

^Martin

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Re: Weird network problem. Tiny lags, connection drops and latency spikes. Is VM a culprit?


@tommygun75 wrote:

Please post a resolution here. We are all having the same issue. thanks


I'm not?

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Message 10 of 13
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Re: Weird network problem. Tiny lags, connection drops and latency spikes. Is VM a culprit?

Can you reboot your hub and post your stats and log after a day or so as we need to know if the Post RS errors will disappear.

Also, are you running two DHCP servers?

--
Hub 3.0, TP-Link Archer C8, TP-Link TL-SG1008D 8-port gigabit switch, V6
My Broadband Ping - Roger's VM Broadband Connection
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