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Netgear CM1150V Extreme Slow Downs

New Poster

Netgear CM1150V Extreme Slow Downs

I have gig-speed internet with a Netgear CM1150V (V2.02.04) connected to a Palo Alto Networks firewall using LACP. I am a network engineer so I can confirm that my home network is not the bottleneck. Every week or so I notice things getting pretty sluggish, like 24mbp down/35mbp up on ethernet. Upload is fine, but download is awful. If I reboot the CM1150V it will come back up and I'll get ~250-300mpb down which is obviously a 10x improvement, but still no where close to a gig.

 

I have browsed the forums, taken a look at the event logs in the CM1150V, and noticed a ton of uncorrectables between channels 13 and 25. I am not very knowledgable about what I should and should not be seeing from the logs and channel locks of the device so I am hoping someone can point me in the correct direction. I know there are a handful of Temperature Errors and if someone tells me that is the reason for the slow speed symptoms then that's a bummer, but I'll figure something out.

 

This issue seems to be far above the support level of the Tier 1 Xfinity guys so I wanted to see if I could get a more definitive answer to pass on to a tech if they come onsite.

 

Thanks for the help.

 

Frequency start Value
This field below allows you to modify the frequency the cable modem start with its scan during initialization and registration. Enter the new start frequency and restart the cable modem for it to take effect.
Starting Frequency
 
Startup Procedure
Procedure Status Comment
Acquire Downstream Channel 489000000 Hz Locked
Connectivity State OK Operational
Boot State OK Operational
Security Enabled BPI+
IP Provisioning Mode Honor MDD honorMdd(4)
 
Downstream Bonded Channels
Channel Lock Status Modulation Channel ID Frequency Power SNR Correctables Uncorrectables
1 Locked QAM256 17 489000000 Hz 4.4 dBmV 40.4 dB 17703 0
2 Locked QAM256 18 495000000 Hz 4.3 dBmV 40.3 dB 22620 0
3 Locked QAM256 19 507000000 Hz 4.7 dBmV 40.4 dB 19201 0
4 Locked QAM256 20 513000000 Hz 4.4 dBmV 40.2 dB 26681 0
5 Locked QAM256 21 519000000 Hz 4.1 dBmV 40 dB 31091 0
6 Locked QAM256 22 525000000 Hz 4.2 dBmV 40 dB 33743 0
7 Locked QAM256 23 531000000 Hz 4.3 dBmV 40 dB 34645 0
8 Locked QAM256 24 543000000 Hz 4.2 dBmV 39.9 dB 40470 0
9 Locked QAM256 25 549000000 Hz 4.3 dBmV 40 dB 39649 0
10 Locked QAM256 26 555000000 Hz 4.1 dBmV 39.9 dB 47299 0
11 Locked QAM256 27 561000000 Hz 4.4 dBmV 40 dB 45535 0
12 Locked QAM256 28 567000000 Hz 5 dBmV 40.1 dB 47546 0
13 Locked QAM256 29 573000000 Hz 5.2 dBmV 40.1 dB 57302 35
14 Locked QAM256 30 579000000 Hz 5.4 dBmV 40 dB 69693 35
15 Locked QAM256 31 585000000 Hz 5.4 dBmV 39.9 dB 84962 47
16 Locked QAM256 32 591000000 Hz 5.7 dBmV 40.1 dB 61886 30
17 Locked QAM256 33 597000000 Hz 6 dBmV 40.1 dB 66622 52
18 Locked QAM256 34 603000000 Hz 5.9 dBmV 39.9 dB 86565 109
19 Locked QAM256 35 609000000 Hz 5.7 dBmV 39.9 dB 96209 167
20 Locked QAM256 36 615000000 Hz 5.6 dBmV 39.8 dB 106232 186
21 Locked QAM256 37 621000000 Hz 5.7 dBmV 39.7 dB 117074 252
22 Locked QAM256 38 627000000 Hz 5.6 dBmV 39.6 dB 134038 246
23 Locked QAM256 39 633000000 Hz 5.7 dBmV 39.6 dB 137798 103
24 Locked QAM256 40 639000000 Hz 5.7 dBmV 39.5 dB 157563 140
25 Locked QAM256 41 645000000 Hz 5.9 dBmV 39.5 dB 133105 112
26 Locked QAM256 42 651000000 Hz 5.8 dBmV 39.4 dB 158897 0
27 Locked QAM256 43 657000000 Hz 5.9 dBmV 39.4 dB 149183 0
28 Locked QAM256 44 663000000 Hz 6 dBmV 39.3 dB 185523 0
29 Locked QAM256 45 669000000 Hz 5.9 dBmV 39.3 dB 203316 0
30 Locked QAM256 46 675000000 Hz 5.9 dBmV 38.9 dB 273193 0
31 Locked QAM256 47 681000000 Hz 5.7 dBmV 39.1 dB 235526 0
32 Not Locked Unknown 0 0 Hz 0.0 dBmV 0.0 dB 0 0
 
Upstream Bonded Channels
Channel Lock Status US Channel Type Channel ID Symbol Rate Frequency Power
1 Locked ATDMA 81 5120 Ksym/sec 17300000 Hz 42 dBmV
2 Locked ATDMA 82 5120 Ksym/sec 23700000 Hz 42.5 dBmV
3 Locked ATDMA 83 5120 Ksym/sec 30300000 Hz 42.5 dBmV
4 Locked ATDMA 84 5120 Ksym/sec 36700000 Hz 41.8 dBmV
5 Not Locked Unknown 0 0 Ksym/sec 0 Hz 0.0 dBmV
6 Not Locked Unknown 0 0 Ksym/sec 0 Hz 0.0 dBmV
7 Not Locked Unknown 0 0 Ksym/sec 0 Hz 0.0 dBmV
8 Not Locked Unknown 0 0 Ksym/sec 0 Hz 0.0 dBmV
 
Downstream OFDM Channels
Channel Lock
Status
Modulation /
Profile ID
Channel
ID
Frequency Power SNR /
MER
Active Subcarrier
Number Range
Unerrored
Codewords
Correctable
Codewords
Uncorrectable
Codewords
1 Locked 0 48 850000000 Hz 5.6 dBmV 36.8 dB 1408 ~ 2687 4686670713 992101 0
2 Not Locked 0 0 0 Hz 0 dBmV 0.0 dB 0 ~ 4095 0 0 0
 
Upstream OFDMA Channels
Channel Lock Status Modulation / Profile ID Channel ID Frequency Power
1 Not Locked 0 0 0 Hz 0 dBmV
2 Not Locked 0 0 0 Hz 0 dBmV
 

 

Mon Aug 26 21:33:00 2019

Critical (3)

THERMAL THROTTLE: Temperature 73C, transition to state Normal

Mon Aug 26 21:32:09 2019

Critical (3)

THERMAL THROTTLE: Temperature 76C, transition to state Elevated 1

Thu Aug 22 23:51:38 2019

Warning (5)

TEK Invalid - Invalid Key Sequence Number;CM-QOS=1.1;CM-VER=3.1;

Thu Aug 15 16:28:47 2019

Critical (3)

THERMAL THROTTLE: Temperature 73C, transition to state Normal

Thu Aug 15 16:25:31 2019

Critical (3)

THERMAL THROTTLE: Temperature 75C, transition to state Elevated 1

Wed Aug 14 17:04:00 2019

Critical (3)

THERMAL THROTTLE: Temperature 73C, transition to state Normal

Wed Aug 14 17:01:19 2019

Critical (3)

THERMAL THROTTLE: Temperature 75C, transition to state Elevated 1

Sun Aug 11 21:29:03 2019

Notice (6)

TLV-11 - unrecognized OID;CM-QOS=1.1;CM-VER=3.1;

Time Not Established

Notice (6)

Honoring MDD; IP provisioning mode = IPv6

Time Not Established

Critical (3)

No Ranging Response received - T3 time-out;CM-QOS=1.1;CM-VER=3.1;

Time Not Established

Critical (3)

SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-QOS=1.1;CM-VER=3.1;

Sun Aug 11 21:22:36 2019

Notice (6)

TLV-11 - unrecognized OID;CM-QOS=1.1;CM-VER=3.1;

Time Not Established

Notice (6)

Honoring MDD; IP provisioning mode = IPv6

Time Not Established

Critical (3)

No Ranging Response received - T3 time-out;CM-QOS=1.1;CM-VER=3.1;

Time Not Established

Critical (3)

SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-QOS=1.1;CM-VER=3.1;

Sun Aug 11 21:16:13 2019

Notice (6)

CM-STATUS message sent. Event Type Code: 4; Chan ID: 48; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: N/A.CM-QOS=1.1;CM-VER=3.1;

Sun Aug 11 21:16:11 2019

Notice (6)

CM-STATUS message sent. Event Type Code: 22; Chan ID: 48; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: N/A.;CM-QOS=1.1;CM-VER=3.1;

Sun Aug 11 21:16:10 2019

Warning (5)

MDD message timeout;CM-QOS=1.1;CM-VER=3.1;

Sun Aug 11 21:16:07 2019

Notice (6)

CM-STATUS message sent. Event Type Code: 22; Chan ID: 48; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: N/A.;CM-QOS=1.1;CM-VER=3.1;

Sun Aug 11 21:15:57 2019

Warning (5)

Dynamic Range Window violation

Sun Aug 11 21:15:57 2019

Warning (5)

RNG-RSP CCAP Commanded Power in Excess of 6 dB Below the Value Corresponding to the Top of the DRW;CM-QOS=1.1;CM-VER=3.1;

Sun Aug 11 21:15:50 2019

Critical (3)

SYNC Timing Synchronization failure - Loss of Sync;CM-QOS=1.1;CM-VER=3.1;

Sun Aug 11 21:15:45 2019

Notice (6)

TLV-11 - unrecognized OID;CM-QOS=1.1;CM-VER=3.1;

Time Not Established

Notice (6)

Honoring MDD; IP provisioning mode = IPv6

Time Not Established

Critical (3)

No Ranging Response received - T3 time-out;CM-QOS=1.1;CM-VER=3.1;

Time Not Established

Critical (3)

SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-QOS=1.1;CM-VER=3.1;

Sun Aug 11 21:02:35 2019

Notice (6)

TLV-11 - unrecognized OID;CM-QOS=1.1;CM-VER=3.1;

Time Not Established

Notice (6)

Honoring MDD; IP provisioning mode = IPv6

Time Not Established

Critical (3)

No Ranging Response received - T3 time-out;CM-QOS=1.1;CM-VER=3.1;

Time Not Established

Critical (3)

SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-QOS=1.1;CM-VER=3.1;

Mon Jul 29 12:54:14 2019

Notice (6)

TLV-11 - unrecognized OID;CM-QOS=1.1;CM-VER=3.1;

Time Not Established

Notice (6)

Honoring MDD; IP provisioning mode = IPv6

Time Not Established

Critical (3)

No Ranging Response received - T3 time-out;CM-QOS=1.1;CM-VER=3.1;

Time Not Established

Critical (3)

SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;CM-QOS=1.1;CM-VER=3.1;

Wed Jul 24 15:40:36 2019

Critical (3)

THERMAL THROTTLE: Temperature 73C, transition to state Normal

Wed Jul 24 15:36:25 2019

Critical (3)

THERMAL THROTTLE: Temperature 75C, transition to state Elevated 1

Mon Jul 22 12:40:40 2019

Notice (6)

TLV-11 - unrecognized OID;CM-QOS=1.1;CM-VER=3.1;

Time Not Established

Notice (6)

Honoring MDD; IP provisioning mode = IPv6

Time Not Established

Critical (3)

No Ranging Response received - T3 time-out;CM-QOS=1.1;CM-VER=3.1;

Time Not Established

Critical (3)

SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;CM-QOS=1.1;CM-VER=3.1;

 

Screen Shot 2019-08-27 at 3.00.03 PM.pngScreen Shot 2019-08-27 at 3.00.04 PM.png

Screen Shot 2019-08-27 at 3.00.18 PM.png

New Poster

Re: Netgear CM1150V Extreme Slow Downs

I wanted to take a second to reply to your post... I am having the same exact issue. Hopefully someone from Comcast or Netgear can get the ball rolling on fixing this bug.

 

This is the message that I posted on Netgear.com Support Forums:

 

Anyone else notice issues with the Netgear CM1150V running on Comcast with the V2.02.x firmware? Particularlly with LACP/LAGG (IEEE 802.3ad) Ethernet Port Aggregation Enabled?

 

I have noticed this since this feature was introduced...

 

If I have LACP/LAGG enabled in the advanced settings on the router connected to my Firewall (OPNSense Virtual Applicance with Intel I350 NIC) all will be fine for a while.  Then a few hours later (not sure exact amount) the internet speed will DRAMATICALLY drop for download. Upload is not affected. 

 

So I will have 950Mbps Down by 45Mbps Up on Comcast DOCSIS 3.1 Gigabit service on immediate power up of the modem, then half way through the day the download will drop to around 25-30Mbps and the upload will remain higher than the download around its 45Mbps mark. 

 

This is reproduceable everytime... I even went as far to buy a Motorola SB8200 for testing (but doesn't support voice) and enabled LACP - works fine for the week of testing at full speed with LACP without issue (Firewall config not touched in anyway).  Also on the Netgear CM1150V if you disable Ethernet Port Aggregation the speeds will remain at their high 950Mbps or so mark.  So their is a bug in Netgears LACP firmware implementation on this Modem which needs to be addressed.

 

https://community.netgear.com/t5/Cable-Modems-Routers/CM1150V-LACP-LAGG-Firmware-Issue-Comcast-V2-02...

New Poster

Re: Netgear CM1150V Extreme Slow Downs

@DanMc85 Very interesting, I did not go so far as to disable the LACP settings on the device, but I will do that now and then report back my findings to see if they align with what you discovered.

New Poster

Re: Netgear CM1150V Extreme Slow Downs

I live in SF and I have the same gig-speed plan, same exact modem (CM1150v) same firmware version (2.02.04). Every other day or so my speed drops down to the same slow speeds you are experiencing and then after a reboot it goes back to around 320Mbps. I hope Comcast/Xfinity can see this to respond. I'm afraid their only response will be to lease their Gateway and somehow blame Netgear for faulty hardware/firmware even though it is an approved modem for their gig-speed plans. 

Expert

Re: Netgear CM1150V Extreme Slow Downs

FWIW, we have seen several posts here indicating that when LAG is enabled with that modem, that problem exists. Probably a firmware thing.



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