CM1150V DHCP fail to router every few minutes

courtneyZ · ‎2020-09-28

Equipment: CM1150V with Comcast, firmware is 2.02.04.

With increasing frequency, DHCP to the router fails. I replaced the aging Wi-Fi router that it was connected to with a new one, thinking this was the problem. Unfortunately the failures continue. I also replaced the Ethernet cable with a brand new one. I have rebooted the CM multiple times over the last few days. The outages are now occuring every few minutes.

The cable connection is good. The CM reports downstream power >= 1.1 dBmV, and the SNR is >= 41.1 dB with all channels locked. The event log doesn't show anything exceptional. The last messages this morning are:

Time 	Priority 	Description
Mon Sep 28 06:26:54 2020	Notice (6)	DS profile assignment change. DS Chan ID: 32; Previous Profile: ; New Profile: 1 2 3.;CM-MAC=28:80:88:0F:FF:FF;CMTS-MAC=00:01:5c:95:bc:64;CM-QOS=1.1;CM-VER=3.1;
Mon Sep 28 06:26:49 2020	Notice (6)	TLV-11 - unrecognized OID;CM-MAC=28:80:88:0F:FF:FF;CMTS-MAC=00:01:5c:95:bc:64;CM-QOS=1.1;CM-VER=3.1;

but i'm pretty sure this is when I power-cycled the modem this modem.

This modem is serving what is now a typical pandemic household, with kids and adults connected to their respective VPNs for school and work.

How can I troubleshoot and fix this? It would be nice if I could capture more detailed logs from the CM.

plemans · ‎2020-09-28

do you have a screen snip of the cable connections page and the logs?

Also, is anything else plugged into the other 3 ports? I know it has more ports but the average consumer can only use port 1 because most ISP's only assign 1 public ip address. so unless you pay for more, are one of the lucky few who's isp does allow more (rare), have a business class line, or have a router that supports wan port aggregation, then only port 1 is usable.

courtneyZ · ‎2020-09-28

@plemansThanks for the prompt response. The only thing plugged into the CM is the router.

Here are the details from the Cable Connections page:

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 	477000000 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	9	477000000 Hz	3.4 dBmV	42.8 dB	0	0
2	Locked	QAM256	6	459000000 Hz	3.8 dBmV	43 dB	0	0
3	Locked	QAM256	7	465000000 Hz	3.7 dBmV	42.9 dB	0	0
4	Locked	QAM256	8	471000000 Hz	3.6 dBmV	42.8 dB	0	0
5	Locked	QAM256	10	483000000 Hz	3.2 dBmV	42.6 dB	0	0
6	Locked	QAM256	11	489000000 Hz	3.4 dBmV	42.7 dB	0	0
7	Locked	QAM256	12	495000000 Hz	3.3 dBmV	42.6 dB	0	0
8	Locked	QAM256	13	519000000 Hz	3 dBmV	42.2 dB	0	0
9	Locked	QAM256	14	525000000 Hz	3 dBmV	42.4 dB	0	0
10	Locked	QAM256	15	531000000 Hz	2.9 dBmV	42.4 dB	0	0
11	Locked	QAM256	16	537000000 Hz	3.1 dBmV	42.5 dB	0	0
12	Locked	QAM256	17	543000000 Hz	3 dBmV	42.4 dB	0	0
13	Locked	QAM256	18	549000000 Hz	2.8 dBmV	42.4 dB	0	0
14	Locked	QAM256	19	555000000 Hz	2.6 dBmV	42.2 dB	0	0
15	Locked	QAM256	20	561000000 Hz	2.6 dBmV	42.1 dB	0	0
16	Locked	QAM256	21	567000000 Hz	2.4 dBmV	42 dB	0	0
17	Locked	QAM256	22	573000000 Hz	2.3 dBmV	41.9 dB	0	0
18	Locked	QAM256	23	579000000 Hz	2.2 dBmV	42 dB	0	0
19	Locked	QAM256	24	585000000 Hz	2.2 dBmV	42 dB	0	0
20	Locked	QAM256	25	591000000 Hz	2.3 dBmV	42.1 dB	0	0
21	Locked	QAM256	26	597000000 Hz	2 dBmV	41.9 dB	0	0
22	Locked	QAM256	27	603000000 Hz	1.9 dBmV	41.9 dB	0	0
23	Locked	QAM256	28	609000000 Hz	1.7 dBmV	41.8 dB	0	0
24	Locked	QAM256	29	615000000 Hz	1.6 dBmV	41.5 dB	0	0
25	Locked	QAM256	30	621000000 Hz	1.5 dBmV	41.6 dB	0	0
26	Locked	QAM256	31	627000000 Hz	1.3 dBmV	41.6 dB	0	0
27	Locked	QAM256	33	633000000 Hz	1.2 dBmV	41.5 dB	0	0
28	Locked	QAM256	34	639000000 Hz	1.1 dBmV	41.5 dB	0	0
29	Locked	QAM256	35	645000000 Hz	1.3 dBmV	41.7 dB	0	0
30	Locked	QAM256	36	651000000 Hz	1.1 dBmV	41.5 dB	0	0
31	Locked	QAM256	37	657000000 Hz	1.1 dBmV	41.5 dB	0	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	1	5120 Ksym/sec	36500000 Hz	41.5 dBmV
2	Locked	ATDMA	2	5120 Ksym/sec	30100000 Hz	41.5 dBmV
3	Locked	ATDMA	3	5120 Ksym/sec	23700000 Hz	40.5 dBmV
4	Locked	ATDMA	7	5120 Ksym/sec	17300000 Hz	39.8 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 ,1 ,2 ,3	32	690000000 Hz	1.0 dBmV	40.9 dB	1108 ~ 2987	22508462	8105875	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
 
Current System Time:Mon Sep 28 09:39:49 2020
System Up Time:03:13:51

Here are the logs:

Time 	Priority 	Description
Mon Sep 28 06:26:54 2020	Notice (6)	DS profile assignment change. DS Chan ID: 32; Previous Profile: ; New Profile: 1 2 3.;CM-MAC=28:80:88:0F:FF:FF;CMTS-MAC=00:01:5c:95:bc:64;CM-QOS=1.1;CM-VER=3.1;
Mon Sep 28 06:26:49 2020	Notice (6)	TLV-11 - unrecognized OID;CM-MAC=28:80:88:0F:FF:FF;CMTS-MAC=00:01:5c:95:bc:64;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-MAC=28:80:88:0F:FF:FF;CMTS-MAC=00:01:5c:95:bc:64;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-MAC=28:80:88:0F:FF:FF;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;
Sun Sep 27 15:51:00 2020	Notice (6)	DS profile assignment change. DS Chan ID: 32; Previous Profile: ; New Profile: 1 2 3.;CM-MAC=28:80:88:0F:FF:FF;CMTS-MAC=00:01:5c:95:bc:64;CM-QOS=1.1;CM-VER=3.1;
Sun Sep 27 15:50:55 2020	Notice (6)	TLV-11 - unrecognized OID;CM-MAC=28:80:88:0F:FF:FF;CMTS-MAC=00:01:5c:95:bc:64;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-MAC=28:80:88:0F:FF:FF;CMTS-MAC=00:01:5c:95:bc:64;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-MAC=28:80:88:0F:FF:FF;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;
Sun Sep 27 15:14:53 2020	Notice (6)	CM-STATUS message sent. Event Type Code: 24; Chan ID: 32; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: 3.;CM-MAC=28:80:88:0F:FF:FF;CMTS-MAC=00:01:5c:95:bc:64;CM-QOS=1.1;CM-VER=3.1;
Sun Sep 27 15:14:24 2020	Notice (6)	CM-STATUS message sent. Event Type Code: 16; Chan ID: 32; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: 3.;CM-MAC=28:80:88:0F:FF:FF;CMTS-MAC=00:01:5c:95:bc:64;CM-QOS=1.1;CM-VER=3.1;
Sun Sep 27 14:49:30 2020	Notice (6)	DS profile assignment change. DS Chan ID: 32; Previous Profile: ; New Profile: 1 2 3.;CM-MAC=28:80:88:0F:FF:FF;CMTS-MAC=00:01:5c:95:bc:64;CM-QOS=1.1;CM-VER=3.1;
Sun Sep 27 14:49:25 2020	Notice (6)	TLV-11 - unrecognized OID;CM-MAC=28:80:88:0F:FF:FF;CMTS-MAC=00:01:5c:95:bc:64;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-MAC=28:80:88:0F:FF:FF;CMTS-MAC=00:01:5c:95:bc:64;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-MAC=28:80:88:0F:FF:FF;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;
Sun Sep 27 14:47:05 2020	Notice (6)	DS profile assignment change. DS Chan ID: 32; Previous Profile: ; New Profile: 1 2 3.;CM-MAC=28:80:88:0F:FF:FF;CMTS-MAC=00:01:5c:95:bc:64;CM-QOS=1.1;CM-VER=3.1;
Sun Sep 27 14:47:00 2020	Notice (6)	TLV-11 - unrecognized OID;CM-MAC=28:80:88:0F:FF:FF;CMTS-MAC=00:01:5c:95:bc:64;CM-QOS=1.1;CM-VER=3.1;
Time Not Established	Notice (6)	Honoring MDD; IP provisioning mode = IPv6
Time Not Established	Critical (3)	SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=28:80:88:0F:FF:FF;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;
Sat Sep 26 23:29:18 2020	Notice (6)	CM-STATUS message sent. Event Type Code: 4; Chan ID: 6 7 8 32 34 37; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: N/A.;CM-MAC=28:80:88:0F:FF:FF;CMTS-MAC=00:01:5c:95:bc:64;CM-QOS=1.1;CM-VER=3.1;
Sat Sep 26 23:29:13 2020	Warning (5)	MDD message timeout;CM-MAC=28:80:88:0F:FF:FF;CMTS-MAC=00:01:5c:95:bc:64;CM-QOS=1.1;CM-VER=3.1;
Thu Sep 24 23:17:45 2020	Notice (6)	CM-STATUS message sent. Event Type Code: 24; Chan ID: 32; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: 0 1 2 3.;CM-MAC=28:80:88:0F:FF:FF;CMTS-MAC=00:01:5c:95:bc:64;CM-QOS=1.1;CM-VER=3.1;
Thu Sep 24 23:17:45 2020	Notice (6)	CM-STATUS message sent. Event Type Code: 22; Chan ID: 32; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: N/A.;CM-MAC=28:80:88:0F:FF:FF;CMTS-MAC=00:01:5c:95:bc:64;CM-QOS=1.1;CM-VER=3.1;
Thu Sep 24 23:17:44 2020	Notice (6)	CM-STATUS message sent. Event Type Code: 23; Chan ID: 32; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: N/A.;CM-MAC=28:80:88:0F:FF:FF;CMTS-MAC=00:01:5c:95:bc:64;CM-QOS=1.1;CM-VER=3.1;
Thu Sep 24 20:30:22 2020	Notice (6)	DS profile assignment change. DS Chan ID: 32; Previous Profile: ; New Profile: 1 2 3.;CM-MAC=28:80:88:0F:FF:FF;CMTS-MAC=00:01:5c:95:bc:64;CM-QOS=1.1;CM-VER=3.1;
Thu Sep 24 20:30:17 2020	Notice (6)	TLV-11 - unrecognized OID;CM-MAC=28:80:88:0F:FF:FF;CMTS-MAC=00:01:5c:95:bc:64;CM-QOS=1.1;CM-VER=3.1;
Time Not Established	Notice (6)	Honoring MDD; IP provisioning mode = IPv6
Time Not Established	Critical (3)	SYNC Timing Synchronization failure - Failed to acquire QAM/QPSK symbol timing;;CM-MAC=28:80:88:0F:FF:FF;CMTS-MAC=00:00:00:00:00:00;CM-QOS=1.1;CM-VER=3.1;
Thu Sep 24 19:49:56 2020	Notice (6)	CM-STATUS message sent. Event Type Code: 22; Chan ID: 32; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: N/A.;CM-MAC=28:80:88:0F:FF:FF;CMTS-MAC=00:01:5c:95:bc:64;CM-QOS=1.1;CM-VER=3.1;
Thu Sep 24 19:49:46 2020	Warning (5)	Dynamic Range Window violation
Thu Sep 24 19:49:46 2020	Warning (5)	RNG-RSP CCAP Commanded Power in Excess of 6 dB Below the Value Corresponding to the Top of the DRW;CM-MAC=28:80:88:0F:FF:FF;CMTS-MAC=00:01:5c:95:bc:64;CM-QOS=1.1;CM-VER=3.1;
Thu Sep 24 19:49:46 2020	Warning (5)	Dynamic Range Window violation
Thu Sep 24 19:49:46 2020	Warning (5)	RNG-RSP CCAP Commanded Power in Excess of 6 dB Below the Value Corresponding to the Top of the DRW;CM-MAC=28:80:88:0F:FF:FF;CMTS-MAC=00:01:5c:95:bc:64;CM-QOS=1.1;CM-VER=3.1;
Thu Sep 24 19:49:46 2020	Warning (5)	Dynamic Range Window violation
Thu Sep 24 19:49:46 2020	Warning (5)	RNG-RSP CCAP Commanded Power in Excess of 6 dB Below the Value Corresponding to the Top of the DRW;CM-MAC=28:80:88:0F:FF:FF;CMTS-MAC=00:01:5c:95:bc:64;CM-QOS=1.1;CM-VER=3.1;
Thu Sep 24 19:49:46 2020	Warning (5)	Dynamic Range Window violation
Thu Sep 24 19:49:46 2020	Warning (5)	RNG-RSP CCAP Commanded Power in Excess of 6 dB Below the Value Corresponding to the Top of the DRW;CM-MAC=28:80:88:0F:FF:FF;CMTS-MAC=00:01:5c:95:bc:64;CM-QOS=1.1;CM-VER=3.1;
Thu Sep 24 19:49:46 2020	Warning (5)	Dynamic Range Window violation

courtneyZ · ‎2020-09-28

Update: Strangely, the link dropped from 1000 Mbps to 100 Mbps. There is nothing in the logs that indicates why this might have happened. However, the link has been stable for just over an hour now. So now i've got two mysteries: why was the link dropping with the 1 Gb link, and why did it renegotiate a link at 100 Mb on its own?

I'll wait a little longer to be sure the link is stable, and then open a new thread for the 1 Gb to 100 Gb drop.

plemans · ‎2020-09-28

I'd contact comcast to check the cmts and re-provision it.

courtneyZ · ‎2020-09-28

So i'm now pretty sure the issue is isolated to the cable modem. Using their troubleshooting tool, I had Comcast reboot the system from their end - not sure if that counts as reprovisioning. I did this a couple of times today. The link instability persisted.

The modem is not able to maintain a 1000 Mbps link to the router. As an exercise, I placed an unmanaged switch between the CM and the router. The port LEDs on the switch indicated that the router was able to maintain a 1 Gbps link, but the CM could only negotiate 100 Mbps.

If I force the router WAN port to 100 Mbps, then the link is stable.

What could be causing the CM to no longer handle a 1 Gbps link.

plemans · ‎2020-09-28

could be a couple things.

1. bad cable.

2. bad port/pins on the port

3. bad modem.

vkdelta · ‎2020-09-29

can you change the cable?

does it drop down to 100M on switch as well?

is the modem in well ventilated area?

CM1150V DHCP fail to router every few minutes

CM1150V DHCP fail to router every few minutes

Re: CM1150V DHCP fail to router every few minutes

Re: CM1150V DHCP fail to router every few minutes

Re: CM1150V DHCP fail to router every few minutes

Re: CM1150V DHCP fail to router every few minutes

Re: CM1150V DHCP fail to router every few minutes

Re: CM1150V DHCP fail to router every few minutes

Re: CM1150V DHCP fail to router every few minutes