Connectivity issues, constant internet drop out issues

[thorkhild]

I've been seeing these in my syslogs when I lose conectivity

kernel: rndbr1: received packet on l2sd0.2 with own address as source address

kernel: mroute: pending queue full, dropping entries 

and these:

2020-09-14 10:03:25 [CRITICAL] Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out
2020-09-14 10:09:41 [WARNING] MIMO Event MIMO: Stored MIMO=-1 post cfg file MIMO=-1
2020-09-14 10:10:42 [CRITICAL] SYNC Timing Synchronization failure - Loss of Sync
2020-09-14 11:15:59 [WARNING] MIMO Event MIMO: Stored MIMO=-1 post cfg file MIMO=-1
2020-09-15 00:40:54 [CRITICAL] No Ranging Response received - T3 time-out
2020-09-22 19:06:13 [WARNING] Lost MDD Timeout
2020-09-23 06:38:26 [CRITICAL] No Ranging Response received - T3 time-out
2020-09-23 07:23:34 [WARNING] Lost MDD Timeout

Hardware: ASUS Ac2600 CM and WIFI router 

here is CM stats:

Upstream Major Frequency

Upstream

23700 KHz

Downstream Major Frequency

Downstream

615000 KHz

Starting Frequency  KHz 

Transmitter # Channel ID Lock Status Frequency Modulation Symbol Rate Channel Type Power

Upstream Channel Status

1	2	Locked	23700000	64 QAM	5120000	ATDMA	51.00 dBmV
2	4	Locked	36500000	64 QAM	5120000	ATDMA	51.00 dBmV
3	3	Locked	30100000	64 QAM	5120000	ATDMA	51.00 dBmV
4	1	Locked	17300000	64 QAM	5120000	ATDMA	51.00 dBmV
0	---	Unlocked	0	---	---	---	---
0	---	Unlocked	0	---	---	---	---
0	---	Unlocked	0	---	---	---	---
0	---	Unlocked	0	---	---	---	---

Receiver # Channel ID Lock Status Frequency Modulation Symbol Rate SNR Power

Downstream Channel Status

1	1(Prm)	Locked	615000000	256 QAM	5360000	37.636 dB	-1.40 dBmV
2	2	Locked	459000000	256 QAM	5360000	38.983 dB	-0.70 dBmV
3	3	Locked	465000000	256 QAM	5360000	38.605 dB	-0.90 dBmV
4	4	Locked	471000000	256 QAM	5360000	38.605 dB	-0.70 dBmV
5	5	Locked	477000000	256 QAM	5360000	38.605 dB	-0.60 dBmV
6	6	Locked	483000000	256 QAM	5360000	38.605 dB	-0.60 dBmV
7	7	Locked	489000000	256 QAM	5360000	38.605 dB	-0.70 dBmV
8	8	Locked	495000000	256 QAM	5360000	38.605 dB	-0.90 dBmV
9	9	Locked	507000000	256 QAM	5360000	38.605 dB	-1.10 dBmV
10	10	Locked	513000000	256 QAM	5360000	38.605 dB	-1.10 dBmV
11	11	Locked	519000000	256 QAM	5360000	37.636 dB	-1.00 dBmV
12	12	Locked	525000000	256 QAM	5360000	38.605 dB	-0.90 dBmV
13	13	Locked	531000000	256 QAM	5360000	38.605 dB	-1.00 dBmV
14	14	Locked	543000000	256 QAM	5360000	37.636 dB	-1.40 dBmV
15	15	Locked	549000000	256 QAM	5360000	37.356 dB	-1.60 dBmV
16	16	Locked	555000000	256 QAM	5360000	37.356 dB	-1.90 dBmV
17	17	Locked	561000000	256 QAM	5360000	37.636 dB	-1.70 dBmV
18	18	Locked	567000000	256 QAM	5360000	37.636 dB	-1.80 dBmV
19	19	Locked	573000000	256 QAM	5360000	37.636 dB	-1.70 dBmV
20	20	Locked	579000000	256 QAM	5360000	37.356 dB	-1.90 dBmV
21	21	Locked	585000000	256 QAM	5360000	32.963 dB	-1.90 dBmV
22	22	Locked	591000000	256 QAM	5360000	32.237 dB	-2.10 dBmV
23	23	Locked	597000000	256 QAM	5360000	36.610 dB	-2.20 dBmV
24	24	Locked	603000000	256 QAM	5360000	37.356 dB	-2.10 dBmV
25	25	Locked	609000000	256 QAM	5360000	37.300 dB	-1.70 dBmV
26	26	Locked	621000000	256 QAM	5360000	37.300 dB	-1.40 dBmV
27	27	Locked	627000000	256 QAM	5360000	36.900 dB	-1.40 dBmV
28	28	Locked	633000000	256 QAM	5360000	36.900 dB	-1.70 dBmV
29	29	Locked	639000000	256 QAM	5360000	36.900 dB	-1.40 dBmV
30	30	Locked	645000000	256 QAM	5360000	36.900 dB	-1.80 dBmV
31	31	Locked	651000000	256 QAM	5360000	36.900 dB	-1.80 dBmV
32	32	Locked	657000000	256 QAM	5360000	36.400 dB	-1.70 dBmV

[EG]

The upstream power is too high and it may be intermittently fluctuating even higher out of spec. That can cause random disconnects, spontaneous re-booting of the modem, speed, packet loss, latency problems, and the un-bonding of channels.

In a self troubleshooting effort to try to obtain better connectivity / more wiggle room, check to see if there are there any excess/unneeded coax cable splitters in the line leading to the modem that can be eliminated/re-configured. Any splitters that remain should be high quality and cable rated for 5-1002 MHz, bi-directional, and no gold colored garbage types like GE, RadioShack, RCA, Philips, Leviton, Magnavox, and Rocketfish from big box stores like Home Depot, Lowes, Target, Wal-Mart etc. Splitters should be swapped with known to be good / new ones to test

If there aren't any unneeded splitters that can be eliminated and if your coax wiring setup can't be reconfigured so that there is a single two way splitter connected directly off of the drop from the street/pole with one port feeding the modem and the other port feeding the rest of the house/equipment with additional splits as needed, and you've checked all the wiring and fittings for integrity and tightness and refresh them by taking them apart then check for and clean off any corrosion / oxidation on the center wire and put them back together again, then perhaps it's best to book a tech visit to investigate and correct.

[thorkhild]

my one splitter is a 3 way splitter from IDEAL with a power pass.   the power pass was conencted to my cable box, and i switched it to my modem/router. 

my power lvl is now 49, and my SNR levels are about 38.9.

I'm going to go investigate using a different splitter, and the wiring outside next. 

[EG]

49 is still on the high side. Looks like more work needs to be done. BTW, that splitter is a garbage brand. It is also engineered more for satellite systems than for cable systems. This can actually introduce problems. I posted info on the proper splitters for cable. 

It may not be the root cause of your issue, but I would swap it to anyway. YMMV. Good luck !