Virgin Media Community

[samosa]

My VM hub4 is run in router mode and connected to a separate router (Asus AC5300) via a 2m Cat8 cable, I also have a switch on the network as each room in my house has two RJ45 ports. I am currently on the 220mb package.

Both my partner and i work from home and are using corporate VPN, MSTeams on our laptops which are connected via RJ45 (Cat8) as well as the kids hammering YouTube, Netflix and online gaming all at the same time. Our work laptops are fairly new and capable of 1gb. The switch config page shows all connections at 1gb as well with the exception of the hue bridge which is only capable of 100mb.

I've noticed a couple of times now, my internet speed is very slow, there is a lot of buffering and calls quality next to nothing resulting in regular disconnection, speedtests show <100mbps. When looking at the router config i see link between Hub4 and Router is only 100mb. 

Normally I've rebooted all network devices (Hub, Router, Switch) which fixes the problem but it's irritating when in middle of work as I need to agree a suitable time to reboot with my partner that works for both our work schedule.

As i'm off this week, I noticed the problem again and thought i'd try to troubleshoot. I first rebooted the Hub4 and when it came back up, the link between Hub4 and Router had restored to 1GB. I carried out a speedtest which was showing speeds of 220mb.

Are you able to remotely check to see if there is issues with my hub, have you had any previous reports of the hub4 identifying the ports as 100mb? 

Example of how i can tell link speed between devices below currently reporting correctly.

I'd be grateful for any assistance. Thank you.

[legacy1]

You got a router which you should use with the hub in modem mode and set QoS/BWM
https://www.waveform.com/tools/bufferbloat

[Anonymous]

As legacy1 suggests the hub should really be in modem mode here not router mode. 

As they also suggest disabling QoS and universal beamforming on the router can help. 

Lastly buffering Teams calls can point to slow upload speed. Therefore please post all of your hub stats from Advanced Settings at 192.168.0.1 (or 192.168.100.1 in modem mode). 

[samosa]

Thank you for the replies, apologies, i made a typo in original post, the hub has always been modem mode with QOS switched off on the router which is running asusmerlin firmware.

I'm getting bufferbloat grade A and this is with partner currently working and son using his iPad

Hub stats:

tandard specification compliant	: DOCSIS 3.1
Hardware version	: 11
Software version	: 01.02.065.21.EURO.PC20(Open Source Information)
Cable MAC address	: xxx
Cable modem serial number	: xxx
System up time	: 0 days 16h:11m:28s
Network access	: Allowed

Cable Modem StatusItem Status CommentsChannel Overview Downstream Upstream

Cable Modem Status	Online	DOCSIS 3.1
Primary downstream channel	Locked	SC-QAM
DOCSIS 3.0 channels	31	4
DOCSIS 3.1 channels	1	0

3.0 Downstream channels

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

3	427000000	3.2	38.6	QAM256	3
1	411000000	3.2	38.6	QAM256	1
2	419000000	3.2	38.6	QAM256	2
4	435000000	3.1	38.6	QAM256	4
5	443000000	3	38.6	QAM256	5
6	451000000	2.4	38.6	QAM256	6
7	459000000	1.9	38.6	QAM256	7
8	467000000	1.7	38.6	QAM256	8
9	475000000	1.7	37.6	QAM256	9
10	483000000	1.6	37.6	QAM256	10
11	491000000	1.7	37.4	QAM256	11
12	499000000	2	37.6	QAM256	12
13	507000000	1.8	37.6	QAM256	13
14	515000000	2.1	37.6	QAM256	14
15	523000000	2.3	37.6	QAM256	15
16	531000000	2.5	37.6	QAM256	16
17	539000000	2.7	38.6	QAM256	17
18	547000000	3	38.6	QAM256	18
19	555000000	3.1	38.6	QAM256	19
20	563000000	3.4	37.6	QAM256	20
21	571000000	3.6	37.6	QAM256	21
22	579000000	3.5	38.6	QAM256	22
23	587000000	3.5	37.6	QAM256	23
24	595000000	3.8	38.6	QAM256	24
25	603000000	3.3	37.6	QAM256	25
26	611000000	3	37.6	QAM256	26
27	619000000	3.4	37.6	QAM256	27
28	627000000	3.2	37.4	QAM256	28
29	635000000	3.1	37.6	QAM256	29
30	643000000	3.5	37.6	QAM256	30
31	651000000	3.6	37.6	QAM256	31

3.0 Downstream channels

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

3	Locked	38.605377	0	0
1	Locked	38.605377	0	0
2	Locked	38.605377	0	0
4	Locked	38.605377	0	0
5	Locked	38.605377	0	0
6	Locked	38.605377	0	0
7	Locked	38.605377	0	0
8	Locked	38.605377	0	0
9	Locked	37.636276	0	0
10	Locked	37.636276	0	0
11	Locked	37.355988	0	0
12	Locked	37.636276	0	0
13	Locked	37.636276	0	0
14	Locked	37.636276	0	0
15	Locked	37.636276	0	0
16	Locked	37.636276	0	0
17	Locked	38.605377	0	0
18	Locked	38.605377	0	0
19	Locked	38.605377	0	0
20	Locked	37.636276	0	0
21	Locked	37.636276	0	0
22	Locked	38.605377	0	0
23	Locked	37.636276	0	0
24	Locked	38.605377	0	0
25	Locked	37.636276	0	0
26	Locked	37.636276	0	0
27	Locked	37.636276	0	0
28	Locked	37.355988	0	0
29	Locked	37.636276	0	0
30	Locked	37.636276	0	0
31	Locked	37.636276	0	0

[samosa]

3.0 Upstream channels

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

1	46200000	38	5120 KSym/sec	64QAM	3
2	39400000	37.8	5120 KSym/sec	64QAM	4
3	53700000	37.8	5120 KSym/sec	64QAM	2
4	60300000	38.8	5120 KSym/sec	64QAM	1

3.0 Upstream channels

Channel Channel Type T1 Timeouts T2 Timeouts T3 Timeouts T4 Timeouts

1	US_TYPE_STDMA	0	0	0	0
2	US_TYPE_STDMA	0	0	0	0
3	US_TYPE_STDMA	0	0	0	0
4	US_TYPE_STDMA	0	0	0	0

General Configuration

Network access	true
Maximum Number of CPEs	1
Baseline Privacy	true
DOCSIS Mode	3.1
Config file	87dsfd;kfoA,.iyewrkldJKDHSUBs

Primary Downstream Service Flow

SFID	15390
Max Traffic Rate	230000061
Max Traffic Burst	42600
Min Traffic Rate	0

Primary Upstream Service Flow

SFID	15389
Max Traffic Rate	22000061
Max Traffic Burst	42600
Min Traffic Rate	0
Max Concatenated Burst	42600
Scheduling Type	bestEffort

Thanks.

[Anonymous]

Thanks. The stats look broadly okay to me.

There is one anomaly around your downstream channel 3 appearing out of sequence in two tables. Others may be able to advise if this has any significance. 

[Anonymous · Accepted solution]

There is also a thread on hub 4 speed issues that might be relevant here https://community.virginmedia.com/t5/Speed/Hub4-sudden-drop-from-1-1Gb-to-94Mb-in-download/td-p/4961...

[samosa]

Thanks for this, seems like it is the same problem.