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Speed issues and "critical" entries in modem network log

Hi all

I've noticed my speeds being poorer than usual lately - instead of a generally rock-solid 350-400MB result on speedtest.net (with various hosts, not just VM) I've been seeing it struggling to reach 100MB.

I run my Hub 3.0 in modem mode (I have my own router and some BT Whole Home discs running the WiFi) and when accessing the modem's homepage and viewing the status, I can see entries such as this in the Network Log:

VMrouterLogOct2020.PNG

If I reset the modem it generally fixes things for a while, but if I recall from my previous posts here I think last time this happened an engineer had to visit the cabinet and sort something out there.

Is that going to be the end result here, or is there something else I can try? I'm not seeing any issues in my area and things aren't impacting working at home (video calls are generally fine), it's just I'm noticing a lack of speed for downloading stuff I need (work files - database backups and such) and doing multiple things - e.g. game streaming on PC using my Shadow and updating the Xbox simultaneously was fine before this, but now they both struggle when sharing less than 100MB between them meaning the Shadow session lags/stutters rendering it useless.

Advice welcomed! 🙂

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Alessandro Volta
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Re: Speed issues and "critical" entries in modem network log

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 your district. Be aware that it isn't a manned line.

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

If everything above is OK we need do some more 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. 

Hub 2 & 3 When the page appears DO NOT LOG IN but click ‘Check Router Status’.

Hub 4 When the page appears LOG IN then 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. Use one post for each tab if you wish. Please do not use screen grabs.

A Guru will be along soon to decipher the info.

***********************************************************************************************************************************

Mike Robinson
Retired Aircraft Engineer & Computer Based Training and Learning Designer for many of the world's Military Arms.


My Broadband Ping - 26_Aug_2020

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Message 3 of 12
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Re: Speed issues and "critical" entries in modem network log

I realise that is just a boiler-plate answer but thanks, and:

Yes, I've done the service status.
TB Monitor Live Graph 

Downstream:

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

12270000002.538256 qam12
21390000004.538256 qam1
31470000004.338256 qam2
41550000004.338256 qam3
5163000000438256 qam4
6171000000438256 qam5
71790000003.938256 qam6
81870000003.738256 qam7
91950000003.238256 qam8
10203000000338256 qam9
112110000002.938256 qam10
122190000002.738256 qam11
132350000002.238256 qam13
142430000002.238256 qam14
152510000002.238256 qam15
162590000002.238256 qam16
172670000002.538256 qam17
182750000002.438256 qam18
192830000001.738256 qam19
20291000000238256 qam20
212990000002.238256 qam21
223070000002.238256 qam22
23315000000238256 qam23
243230000001.738256 qam24



Downstream bonded channels

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

1Locked38.628633407
2Locked38.920623826344
3Locked38.916274415899
4Locked38.91185791553
5Locked38.988978693
6Locked38.649465471
7Locked38.941867693
8Locked38.639452404
9Locked38.639076485
10Locked38.640689380
11Locked38.936079374
12Locked38.932117321
13Locked38.924937350
14Locked38.621744348
15Locked38.618347298
16Locked38.614730298
17Locked38.910648229
18Locked38.68059355
19Locked38.95200247
20Locked38.63615380
21Locked38.92419418
22Locked38.91487284
23Locked38.63574228
24Locked38.91643


218

 

Upstream:

Upstream bonded channels

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

1462001633.825512064 qam3
2394000813.775512064 qam4
3537000933.9512064 qam2
4326000313.75512064 qam5



Upstream bonded channels

Channel Channel Type T1 Timeouts T2 Timeouts T3 Timeouts T4 Timeouts

1ATDMA0000
2ATDMA0000
3ATDMA0000
4ATDMA0000



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Re: Speed issues and "critical" entries in modem network log

Network Log

Time Priority Description

21/10/2020 12:46:11criticalNo Ranging Response received - T3 time-out;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
19/10/2020 05:40:15ErrorDHCP RENEW WARNING - Field invalid in response v4 option;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
17/10/2020 19:38:46criticalNo Ranging Response received - T3 time-out;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
15/10/2020 23:45:45Warning!RCS Partial Service;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
15/10/2020 17:10:15ErrorDHCP RENEW WARNING - Field invalid in response v4 option;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
13/10/2020 09:09:33Warning!RCS Partial Service;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
12/10/2020 19:47:35ErrorDHCP RENEW WARNING - Field invalid in response v4 option;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
12/10/2020 02:15:49criticalNo Ranging Response received - T3 time-out;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
09/10/2020 02:14:15Warning!RCS Partial Service;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
09/10/2020 00:47:20criticalNo Ranging Response received - T3 time-out;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
08/10/2020 01:32:52ErrorDHCP RENEW WARNING - Field invalid in response v4 option;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
08/10/2020 01:02:25criticalNo Ranging Response received - T3 time-out;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
08/10/2020 01:00:44criticalReceived Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
08/10/2020 00:56:22Warning!Lost MDD Timeout;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
08/10/2020 00:56:18criticalSYNC Timing Synchronization failure - Loss of Sync;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
08/10/2020 00:56:18Warning!RCS Partial Service;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
08/10/2020 00:56:18criticalSYNC Timing Synchronization failure - Loss of Sync;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
08/10/2020 00:56:18Warning!RCS Partial Service;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
07/10/2020 03:15:45ErrorDHCP REBIND WARNING - Field invalid in response;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
06/10/2020 01:58:26ErrorDHCP RENEW sent - No response for IPv4;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
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Message 5 of 12
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Re: Speed issues and "critical" entries in modem network log

Your BQM is showing all red, this normally indicates that the Router isn't responding to ping.

Can you log into the Router settings and set your Router to respond to Ping (ICMP).

***********************************************************************************************************************************

Mike Robinson
Retired Aircraft Engineer & Computer Based Training and Learning Designer for many of the world's Military Arms.


My Broadband Ping - 26_Aug_2020

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Re: Speed issues and "critical" entries in modem network log

Your Pre & Post RS Error counts are very high.

In an ideal world they would be at zero and stay there. To zero them can you reboot the Hub using this method and then keep an eye on the counts.

Switch the Hub off using the small switch on the rear of the Hub next to the power cord and pull the PSU plug from the wall socket.

Give it a good 5 minutes put the plug back in and switch the Hub back on.

Allow the Hub a few minutes to fully restart then check the error counts in one hour.

***********************************************************************************************************************************

Mike Robinson
Retired Aircraft Engineer & Computer Based Training and Learning Designer for many of the world's Military Arms.


My Broadband Ping - 26_Aug_2020

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Re: Speed issues and "critical" entries in modem network log

It was set to respond, however the graph now seems to be populating after I rebooted the VM Hub.

And the newly refreshed data from the status after the reboot...

Downstream bonded channels

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

1Locked38.950
2Locked38.950
3Locked38.650
4Locked38.9200
5Locked38.950
6Locked38.960
7Locked38.970
8Locked38.960
9Locked38.650
10Locked38.960
11Locked38.940
12Locked38.650
13Locked38.950
14Locked38.670
15Locked38.980
16Locked38.670
17Locked38.970
18Locked38.660
19Locked38.650
20Locked38.930
21Locked38.650
22Locked38.960
23Locked38.970
24Locked38.900
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Message 8 of 12
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Re: Speed issues and "critical" entries in modem network log

Your >> BQM << is starting to show a proper graph but will need a few more hours before any kind of trend can be seen.

Your Hub data all looks good.

What speed do you get at >> speedtest.net << with a direct connection using a Cat 5E/6 cable between the Hub in Router Mode and a 1Gbs capable Pc/Mac/Chromebook and no other devices connected ?

***********************************************************************************************************************************

Mike Robinson
Retired Aircraft Engineer & Computer Based Training and Learning Designer for many of the world's Military Arms.


My Broadband Ping - 26_Aug_2020

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Message 9 of 12
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Re: Speed issues and "critical" entries in modem network log

It's back to what I'm used to seeing normally (with variations depending on the chosen server), but as I said in the OP this is generally the case after a modem reboot and it'll be a few days before I see the degradation.

VMspeedtestOct2020.PNG

 

Edit: seems like the image in the OP isn't displaying and this one is currently 'being checked' so in case it doesn't show up, it was a snip from speedtest showing the results from Bath Uni, 17ms ping / 382.61 Mbps down / 33.62 Mbps up

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Re: Speed issues and "critical" entries in modem network log

Hello, thought I'd bump this with an update. Download speeds are once again slowed down to < 100MB and there is noticeable impact on video calls (people report my video breaking up etc). The modem has not been rebooted since my initial post (but will be in about 10 mins), so here are some fresh stats:

Network Log

Time Priority Description

12/11/2020 05:56:35noticeLAN login Success;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
11/11/2020 04:12:2criticalNo Ranging Response received - T3 time-out;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
10/11/2020 17:19:52ErrorDHCP RENEW WARNING - Field invalid in response v4 option;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
10/11/2020 09:08:56criticalNo Ranging Response received - T3 time-out;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
07/11/2020 05:19:51ErrorDHCP RENEW WARNING - Field invalid in response v4 option;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
06/11/2020 07:15:40Warning!RCS Partial Service;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
05/11/2020 15:00:59criticalNo Ranging Response received - T3 time-out;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
04/11/2020 07:54:51ErrorDHCP RENEW WARNING - Field invalid in response v4 option;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
02/11/2020 02:02:36noticeSW download Successful - Via NMS
02/11/2020 01:58:56noticeSW Download INIT - Via NMS
01/11/2020 06:35:10criticalNo Ranging Response received - T3 time-out;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
30/10/2020 13:44:49ErrorDHCP RENEW WARNING - Field invalid in response v4 option;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
27/10/2020 14:39:23criticalNo Ranging Response received - T3 time-out;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
27/10/2020 01:44:49ErrorDHCP RENEW WARNING - Field invalid in response v4 option;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
25/10/2020 10:18:49criticalNo Ranging Response received - T3 time-out;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
24/10/2020 08:49:22ErrorDHCP RENEW WARNING - Field invalid in response v4 option;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
23/10/2020 08:21:6criticalNo Ranging Response received - T3 time-out;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
22/10/2020 12:53:30noticeLAN login Success;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
22/10/2020 12:52:54Warning!LAN login FAILED : Incorrect Username / Password / ConnectionType;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
21/10/2020 12:46:11criticalNo Ranging Response received - T3 time-out;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;

 

Downstream bonded channels

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

1Locked38.6235122
2Locked38.9249118
3Locked38.6270119
4Locked38.6254136
5Locked38.6197121
6Locked38.6251146
7Locked38.9294134
8Locked38.6179221
9Locked38.9152128
10Locked38.6185177
11Locked38.6246161
12Locked38.6275111
13Locked38.9330149
14Locked38.9215130
15Locked38.9192107
16Locked38.9201101
17Locked38.617656
18Locked38.619567
19Locked38.921057
20Locked38.917469
21Locked38.625777
22Locked38.623363
23Locked38.626371
24Locked37.634661
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