Reply

C6300 keeps dropping internet

209adrian
Aspirant

C6300 keeps dropping internet

I have 9 devices, Included all the smart home stuff.
This happens several times a day for several minutes where the internet just drops. I haven’t changed my internet habits to initiate this intermediate problem. Called ISP, their end is good. I power cycled, reset the modem, and check all connections.
My current Firmware is V3.01.14
Hardware v4.0
When it stops working I do see a orange light on the upload symbol
I took a screenshot of the event logs
And the logs:
[Internet connected] 73.92.218.191 2 Sunday, 01 Aug 2021 19:17:51 0.0.0.0 0.0.0.0
[Time synchronized with ToD server] 1 Sunday, 01 Aug 2021 19:17:18 0.0.0.0 0.0.0.0
[Internet disconnected] 1 Sunday, 01 Aug 2021 19:16:39 0.0.0.0 0.0.0.0
[DHCP IP: (192.168.0.26)] to MAC address 70:2c:1f:7b:3e:b1 2 Sunday, 01 Aug 2021 19:16:09 0.0.0.0 0.0.0.0
Model: C6300BD-1CXNAS|Docsis 3.0 AC1750 Cable Modem Router
Message 1 of 10

Accepted Solutions
FURRYe38
Guru

Re: C6300 keeps dropping internet

Please post a copy and paste of the modems connection status page.
Have the ISP check the signal and line quality UP to the modem. Be sure the ISP provisions the modem correctly.
Be sure there are no coax cable line splitters in the between the modem and ISP service box. 
Be sure your using good quality RG6 coax cable up to the modem. 
https://community.netgear.com/t5/Cable-Modems-Routers/General-info-and-Troubleshooting-for-Cable-Mod...

My Setup ISP SparkLight | Internet Cable 1000↓/50↑ CM2000 Modem | Wifi Router SXK30(v.122) and R8500(v.158) Router Mode and Wired Backhaul | Switches NG GS105/8 | 

Additional NG HW: C7800/CAX80/CM1100/CM1200/CM2000, Orbi: CBK40, CBK752, RBK50, RBK853, RBK752, RBK953, SXK30 | NightHawk: R7000, R7800, R7960P, R8000, R8500, RAXE500, RAX50, XR450, EX7500/EX7700, GS308v3

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Message 3 of 10

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209adrian
Aspirant

Re: C6300 keeps dropping internet


Aug 01 2021 19:17:21 Warning (5) MIMO Event MIMO: Stored MIMO=-1 post cfg file MIMO=-1
Aug 01 2021 19:16:55 Critical (3) No Ranging Response received - T3 time-out
Aug 01 2021 19:16:26 Critical (3) Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out
Aug 01 2021 19:12:29 Critical (3) No Ranging Response received - T3 time-out
Aug 01 2021 19:12:28 Critical (3) Unicast Maintenance Ranging attempted - No response - Retries exhausted
Aug 01 2021 19:12:28 Critical (3) Ranging Request Retries exhausted
Aug 01 2021 19:12:20 Critical (3) No Ranging Response received - T3 time-out
Aug 01 2021 19:12:06 Critical (3) Unicast Maintenance Ranging attempted - No response - Retries exhausted
Aug 01 2021 19:12:06 Critical (3) Ranging Request Retries exhausted
Aug 01 2021 19:11:39 Critical (3) No Ranging Response received - T3 time-out
Aug 01 2021 19:11:38 Critical (3) Unicast Maintenance Ranging attempted - No response - Retries exhausted
Aug 01 2021 19:11:38 Critical (3) Ranging Request Retries exhausted
Aug 01 2021 19:10:54 Critical (3) No Ranging Response received - T3 time-out
Message 2 of 10
FURRYe38
Guru

Re: C6300 keeps dropping internet

Please post a copy and paste of the modems connection status page.
Have the ISP check the signal and line quality UP to the modem. Be sure the ISP provisions the modem correctly.
Be sure there are no coax cable line splitters in the between the modem and ISP service box. 
Be sure your using good quality RG6 coax cable up to the modem. 
https://community.netgear.com/t5/Cable-Modems-Routers/General-info-and-Troubleshooting-for-Cable-Mod...

My Setup ISP SparkLight | Internet Cable 1000↓/50↑ CM2000 Modem | Wifi Router SXK30(v.122) and R8500(v.158) Router Mode and Wired Backhaul | Switches NG GS105/8 | 

Additional NG HW: C7800/CAX80/CM1100/CM1200/CM2000, Orbi: CBK40, CBK752, RBK50, RBK853, RBK752, RBK953, SXK30 | NightHawk: R7000, R7800, R7960P, R8000, R8500, RAXE500, RAX50, XR450, EX7500/EX7700, GS308v3

Message 3 of 10
209adrian
Aspirant

Re: C6300 keeps dropping internet

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

<tabindex=-1>Startup Procedure</tabindex=-1>

ProcedureStatusComment
Acquire Downstream Channel579000000 HzLocked
Connectivity StateOkOperational
Boot StateOkOperational
SecurityEnabledBPI+
IP Provisioning ModeHonor MDDhonorMdd(4)

Downstream Bonded Channels

ChannelLock StatusModulationChannel IDFrequencyPowerSNRCorrectablesUnCorrectables
1LockedQAM 25632579000000 Hz-1.2 dBmV38.6 dB6762
2LockedQAM 25633585000000 Hz-1.4 dBmV38.6 dB6830
3LockedQAM 25634591000000 Hz-1.5 dBmV38.9 dB8027
4LockedQAM 25635597000000 Hz-1.5 dBmV37.6 dB5731
5LockedQAM 25636603000000 Hz-1.4 dBmV38.6 dB5828
6LockedQAM 25637609000000 Hz-1.5 dBmV38.9 dB6321
7LockedQAM 25638615000000 Hz-1.7 dBmV37.6 dB7422
8LockedQAM 25639621000000 Hz-2.0 dBmV37.6 dB7829
9LockedQAM 25640627000000 Hz-2.0 dBmV37.3 dB8623
10LockedQAM 25641633000000 Hz-2.0 dBmV37.6 dB8723
11LockedQAM 25642639000000 Hz-2.2 dBmV37.6 dB5630
12LockedQAM 25643645000000 Hz-2.5 dBmV37.6 dB6423
13LockedQAM 25644651000000 Hz-2.7 dBmV37.3 dB1030
14LockedQAM 25645657000000 Hz-3.0 dBmV37.3 dB810
15LockedQAM 25646663000000 Hz-3.0 dBmV37.3 dB8817
16LockedQAM 25647669000000 Hz-3.0 dBmV37.6 dB979

Upstream Bonded Channels

ChannelLock StatusUS Channel TypeChannel IDSymbol RateFrequencyPower
1LockedATDMA25120 Ksym/sec22800000 Hz44.0 dBmV
2LockedATDMA35120 Ksym/sec29200000 Hz43.8 dBmV
3LockedATDMA45120 Ksym/sec35600000 Hz43.5 dBmV
4LockedATDMA52560 Ksym/sec40400000 Hz44.3 dBmV

Current System Time: Mon Aug 2 19:33:02 2021System Up Time: 1 day 03:32:33

Message 4 of 10
209adrian
Aspirant

Re: C6300 keeps dropping internet

ISP reports showing the modem in an active status and the device is not showing an up time reset. We were also able to successfully ping the device and receive replies with no packet loss.
Message 5 of 10
FURRYe38
Guru

Re: C6300 keeps dropping internet

So did the ISP correct the problem then? 

My Setup ISP SparkLight | Internet Cable 1000↓/50↑ CM2000 Modem | Wifi Router SXK30(v.122) and R8500(v.158) Router Mode and Wired Backhaul | Switches NG GS105/8 | 

Additional NG HW: C7800/CAX80/CM1100/CM1200/CM2000, Orbi: CBK40, CBK752, RBK50, RBK853, RBK752, RBK953, SXK30 | NightHawk: R7000, R7800, R7960P, R8000, R8500, RAXE500, RAX50, XR450, EX7500/EX7700, GS308v3

Message 6 of 10
209adrian
Aspirant

Re: C6300 keeps dropping internet

They did not.
Message 7 of 10
FURRYe38
Guru

Re: C6300 keeps dropping internet

Keep on them. Review the suggestion given. 

My Setup ISP SparkLight | Internet Cable 1000↓/50↑ CM2000 Modem | Wifi Router SXK30(v.122) and R8500(v.158) Router Mode and Wired Backhaul | Switches NG GS105/8 | 

Additional NG HW: C7800/CAX80/CM1100/CM1200/CM2000, Orbi: CBK40, CBK752, RBK50, RBK853, RBK752, RBK953, SXK30 | NightHawk: R7000, R7800, R7960P, R8000, R8500, RAXE500, RAX50, XR450, EX7500/EX7700, GS308v3

Message 8 of 10
vkdelta
NETGEAR Expert

Re: C6300 keeps dropping internet

this is an really an ISP problem. Logs clearly show it.

when you see "Unicast Maintenance Ranging attempted - No response - Retries exhausted" that means one of the upstream channels is having noise or completely disconnected. this is outside your home or street level noise.

 

who is the ISP? 

 

 

Aug 01 2021 19:12:29 Critical (3) No Ranging Response received - T3 time-out
Aug 01 2021 19:12:28 Critical (3) Unicast Maintenance Ranging attempted - No response - Retries exhausted
Aug 01 2021 19:12:28 Critical (3) Ranging Request Retries exhausted
Aug 01 2021 19:12:20 Critical (3) No Ranging Response received - T3 time-out
Aug 01 2021 19:12:06 Critical (3) Unicast Maintenance Ranging attempted - No response - Retries exhausted
Aug 01 2021 19:12:06 Critical (3) Ranging Request Retries exhausted
Aug 01 2021 19:11:39 Critical (3) No Ranging Response received - T3 time-out
Aug 01 2021 19:11:38 Critical (3) Unicast Maintenance Ranging attempted - No response - Retries exhausted
Aug 01 2021 19:11:38 Critical (3) Ranging Request Retries exhausted
Aug 01 2021 19:10:54 Critical (3) No Ranging Response received - T3 time-out

Message 9 of 10
209adrian
Aspirant

Re: C6300 keeps dropping internet

ISP is xfinity Comcast.
Message 10 of 10
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