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DuncanInnes
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Intermittent speeds and ping spikes/drops

Folks,

With the new isolation and enforced WFH regime, I've been looking into my home network setup to iron out some problems.  I'm frequently finding my download speed dropping to below 2Mbit/sec at the same time as ping responses jump from around 10ms to well into the hundreds.

I set up a Smokeping server (wired) to ping several internal connections as well as external.  I'm finding multiple times a day the external pings are spiking to up to 300ms and dropping up to 50% of packets.  During these times it is, of course, extremely hard to follow video conference calls.  Frustrating as I'm on 350Mbit service.

I haven't managed to correlate the ping drops/spikes with Speedtest results, but I'm also showing dramatic speed drops, but normally only for the download.  Upload remains relatively stable at 36Mbit, but the download drops through the floor to less that 2Mbit/sec (regularly down below 0.1Mbit when I test when I've been disconnected from work Skype calls).

Not sure where to start on diagnosing further, but I also ping test the Modem and find that around half the time it doesn't return pings AT ALL!  Not expecting that.  Very occasionally it starts behaving for a while.  Last time this happened I managed a whole 4 hours of ~2ms ping responses before it started playing up and dropping 90+% of packets.

Everything else internal behaves as expected with pings.  Modem is in modem mode.  Cat6A to a Turris Omnia Router.  Cat 6A to a Netgear Gigabit switch.  Linksys Velop system connected to this switch via Cat6A (although I don't trust it, so exclude any wireless connections from my monitoring/testing).  I've replaced multiple cables and even swapped over the Netgear switch.

Am at a loss.  Any help gratefully received.  It's driving me crazy trying to work from home with a service like this.  Unsure if it's related, but my V6 box also struggles to display any HD channel from 5HD onwards without blocking. Minor inconvenience as we use FreeSat HD channels unless we need to record to the V6 box.

D

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matthewmogford
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Re: Intermittent speeds and ping spikes/drops

I have the exact same situation.

Paying now £60 per month! For 350mbps, and I'm only getting 80mbps. Sometimes dropping to 6-10mbps.

I know times are a bit crazy, but if Virgin can't deliver anywhere near promised speeds, I shouldn't have to pay full price for a poor service.

DuncanInnes
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Re: Intermittent speeds and ping spikes/drops

Internal Smokeping for last 12 hours:

Smokeping_Internal.PNG

Note: Modem was rebooted an hour ago, so has been behaving longer than normal at the recent end of it's graph.

 

External Smokeping for same period:

Smokeping_External.PNG

DNS1 and DNS2 are the two DNS servers reported by the Turris Omnia Router: 194.168.4.100 and 194.168.8.100

Area Reference: 20

 

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DuncanInnes
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Re: Intermittent speeds and ping spikes/drops

Status:

Item Status Comments

Acquired Downstream Channel (Hz)
226750000
Locked
Ranged Upstream Channel (Hz)
53700228
Locked
Provisioning State
Online
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DuncanInnes
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Re: Intermittent speeds and ping spikes/drops

Downstream bonded channels

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

1226750000240256 qam12
2138750000640256 qam1
3146750000540256 qam2
41547500004.540256 qam3
51627500004.140256 qam4
6170750000440256 qam5
71787500003.540256 qam6
81867500003.440256 qam7
91947500003.240256 qam8
10202750000340256 qam9
112107500002.740256 qam10
122187500002.540256 qam11
132347500001.940256 qam13
142427500001.540256 qam14
152507500001.440256 qam15
162587500000.940256 qam16
172667500000.740256 qam17
182747500000.440256 qam18
192827500000.240256 qam19
20290750000040256 qam20
21298750000040256 qam21
22306750000-0.440256 qam22
23314750000-0.740256 qam23
24322750000-140256 qam24



Downstream bonded channels

Channel Locked Status RxMER (dB) Pre RS Errors Post RS Errors

1Locked40.9110
2Locked40.900
3Locked40.330
4Locked40.370
5Locked40.9190
6Locked40.3210
7Locked40.360
8Locked40.380
9Locked40.350
10Locked40.960
11Locked40.970
12Locked40.950
13Locked40.3310
14Locked40.3180
15Locked40.9150
16Locked40.9170
17Locked40.3210
18Locked40.3350
19Locked40.3350
20Locked40.3270
21Locked40.3300
22Locked40.3270
23Locked40.3450
24Locked40.3280
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DuncanInnes
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Message 6 of 41
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Re: Intermittent speeds and ping spikes/drops

Upstream bonded channels

Channel Frequency (Hz) Power (dBmV) Symbol Rate (ksps) Modulation Channel ID

1537002284.55512064 qam2
2462000004.5512064 qam3
3394000004.45512064 qam4
4603000004.45512064 qam1



Upstream bonded channels

Channel Channel Type T1 Timeouts T2 Timeouts T3 Timeouts T4 Timeouts

1ATDMA0000
2ATDMA0000
3ATDMA0000
4ATDMA0000
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DuncanInnes
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Re: Intermittent speeds and ping spikes/drops

Network Log

Time Priority Description

09/04/2020 19:51:2noticeLAN login Success;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
01/01/1970 00:01:30criticalNo Ranging Response received - T3 time-out;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
09/04/2020 19:45:30noticeLAN login Success;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
09/04/2020 19:45:23Warning!LAN login FAILED : Incorrect Username / Password / ConnectionType;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
06/04/2020 21:41:53criticalNo Ranging Response received - T3 time-out;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
06/04/2020 12:15:43ErrorDHCP REBIND WARNING - Field invalid in response;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
05/04/2020 13:52:4ErrorDHCP RENEW sent - No response for IPv4;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
03/04/2020 01:44:52criticalNo Ranging Response received - T3 time-out;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
02/04/2020 03:45:38ErrorDHCP REBIND WARNING - Field invalid in response;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
31/03/2020 23:21:7ErrorDHCP RENEW sent - No response for IPv4;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
28/03/2020 07:58:38criticalNo Ranging Response received - T3 time-out;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
27/03/2020 15:13:46noticeLAN login Success;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
27/03/2020 15:13:36Warning!LAN login FAILED : Incorrect Username / Password / ConnectionType;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
01/01/1970 00:01:32criticalNo Ranging Response received - T3 time-out;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
23/03/2020 09:43:50noticeLAN login Success;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
23/03/2020 09:43:44Warning!LAN login FAILED : Incorrect Username / Password / ConnectionType;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
23/03/2020 09:35:50criticalSYNC Timing Synchronization failure - Loss of Sync;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
23/03/2020 09:35:50Warning!RCS Partial Service;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
23/03/2020 09:35:49criticalSYNC Timing Synchronization failure - Loss of Sync;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
23/03/2020 02:45:0ErrorDHCP REBIND WARNING - Field invalid in response;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
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DuncanInnes
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Message 8 of 41
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Re: Intermittent speeds and ping spikes/drops

With Modem freshly booted, I'm getting Speedtest.net results of:

Ping: 8ms

Down: 382.02 Mbps

Up: 26.41 Mbps

Will lay a bet that these start to go wonky within 24 hours.

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DuncanInnes
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Re: Intermittent speeds and ping spikes/drops

Modem is back to misbehaving on Smokeping:

Smokeping_Modem.PNG

Smokeping_DNS2.PNG

This period where the Modem isn't returning any pings corresponds to extremely flaky behaviour with internet ping and download speeds.

Is the modem firmware shonky? Or are my power levels in need of a quick tuning?

D

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legacy1
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Message 10 of 41
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Re: Intermittent speeds and ping spikes/drops


@DuncanInnes wrote:

Is the modem firmware shonky? 


Yes VM need to roll back the firmware but it takes sound for VM to listen.

are you on  9.1.1811.401

 

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