Orbi WiFi 7 RBE973
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Re: CM1150V and AC1600 connection problems

smgillespie28
Aspirant

CM1150V and AC1600 connection problems

Been using an AC1600 with wifi disabled as a wired router for my CM1150V for a while now with no troubles.   Big storm last night (yes, plenty of surge protection).    When power came back on, the AC1600 no longer sees the internet when connected to the CM1150V but when I connect my desktop computer (windows 10) to the CM1150V, it has no problem and I have full internet access.   Computer can log into the AC1600 when plugged into it and the ac1600 seems to thinks it's not plugged into anything and I did try to use different network cables - even the one that works fine when the computer is directly connected to the CM1150V.   Tried a factory reset on the AC1600 with no change.  Haven't gone as far as a factory reset with the CM1150V.

 

Yes, I know one possibility is that the AC1600 died.  But the problem is I also have an AC1750 and I'm seeing the exact same problem if I try to replace the AC1600 with the AC1750.  And I know it's possible but I have a hard time believing both routers died at the same time.  So it seems to me that for some reason a computer can connect to the cable modem but a router can not.

 

Appreciate any ideas or suggestions.

 

Thanks,
Stuart

 

 

Message 1 of 10
FURRYe38
Guru

Re: CM1150V and AC1600 connection problems

AC1600 isn't a model number of a router.

 

Please post a copy and paste of the modems connection status page.


Be sure your using a good quality LAN cable between the modem and router. CAT6 is recommended. 
What is the brand and model of the host wifi router connected to the modem?


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. 
Be sure to power OFF the modem for 1 minute then back ON.
https://community.netgear.com/t5/Cable-Modems-Routers/General-info-and-Troubleshooting-for-Cable-Mod...
https://kb.netgear.com/24311/Power-level-guidelines-for-a-NETGEAR-cable-modem-router?article=24311
https://www.duckware.com/tech/solving-intermittent-cable-modem-issues.html

Message 2 of 10
smgillespie28
Aspirant

Re: CM1150V and AC1600 connection problems

AC1600 isn't a model number of a router.

 

It's the name, not the model number.  Model number is R6260

router.PNG

In house cabling and coax is the same that's been working well for several years.

 

Be sure to power OFF the modem for 1 minute then back ON.

 

Did that but will do it again.

 

Please post a copy and paste of the modems connection status page.

 

Is this what you're looking for?

Modem connection 1.PNGModem connection 2.PNG

Message 3 of 10
FURRYe38
Guru

Re: CM1150V and AC1600 connection problems

Select the Cable Connection button you see on the modems web page. Copy and paste what you see on that page here.

 

 

Message 4 of 10
smgillespie28
Aspirant

Re: CM1150V and AC1600 connection problems

 

Cable Connection
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
 Starting Frequency: 0
 

Startup Procedure
Procedure Status Comment
Acquire Downstream Channel651000000 HzLocked
Connectivity StateOKOperational
Boot StateOKOperational
SecurityEnabledBPI+
IP Provisioning ModeHonor MDDhonorMdd(4)

 

Downstream Bonded Channels
Channel Lock Status Modulation Channel ID Frequency Power SNR Correctables Uncorrectables
1LockedQAM25637651000000 Hz-6.7 dBmV39.6 dB120
2LockedQAM25613507000000 Hz-3.3 dBmV41.3 dB80
3LockedQAM25614513000000 Hz-3.3 dBmV41.4 dB30
4LockedQAM25615519000000 Hz-3.6 dBmV41.3 dB20
5LockedQAM25616525000000 Hz-3.8 dBmV41.2 dB70
6LockedQAM25617531000000 Hz-4 dBmV41.1 dB20
7LockedQAM25618537000000 Hz-4.3 dBmV41 dB20
8LockedQAM25619543000000 Hz-4.5 dBmV41 dB70
9LockedQAM25620549000000 Hz-4.8 dBmV40.8 dB40
10LockedQAM25621555000000 Hz-5 dBmV40.6 dB30
11LockedQAM25622561000000 Hz-5.2 dBmV40.6 dB70
12LockedQAM25623567000000 Hz-5.6 dBmV40.3 dB60
13LockedQAM25624573000000 Hz-6 dBmV40.1 dB100
14LockedQAM25625579000000 Hz-5.7 dBmV40.3 dB60
15LockedQAM25626585000000 Hz-5.2 dBmV40.4 dB90
16LockedQAM25627591000000 Hz-5.1 dBmV40.5 dB50
17LockedQAM25628597000000 Hz-5 dBmV40.5 dB70
18LockedQAM25629603000000 Hz-5 dBmV40.5 dB90
19LockedQAM25630609000000 Hz-5.3 dBmV40.4 dB50
20LockedQAM25631615000000 Hz-5.5 dBmV40.2 dB100
21LockedQAM25632621000000 Hz-5.7 dBmV40.1 dB60
22LockedQAM25633627000000 Hz-5.9 dBmV40 dB70
23LockedQAM25634633000000 Hz-6.1 dBmV40 dB130
24LockedQAM25635639000000 Hz-6.3 dBmV39.7 dB60
25LockedQAM25636645000000 Hz-6.6 dBmV39.6 dB130
26LockedQAM25638657000000 Hz-6.8 dBmV39.6 dB110
27LockedQAM25639663000000 Hz-6.6 dBmV39.7 dB120
28LockedQAM25640669000000 Hz-6.5 dBmV39.8 dB110
29LockedQAM25641675000000 Hz-6.6 dBmV38.5 dB170
30LockedQAM25642681000000 Hz-6.5 dBmV39.8 dB190
31LockedQAM25643687000000 Hz-6.5 dBmV39.7 dB110
32LockedQAM25644693000000 Hz-6.6 dBmV39.6 dB180

 

Upstream Bonded Channels
Channel Lock Status US Channel Type Channel ID Symbol Rate Frequency Power
1LockedATDMA25120 Ksym/sec16400000 Hz38.5 dBmV
2LockedATDMA35120 Ksym/sec22800000 Hz39 dBmV
3LockedATDMA45120 Ksym/sec29200000 Hz39.5 dBmV
4LockedATDMA55120 Ksym/sec35600000 Hz40 dBmV
5Not LockedUnknown00 Ksym/sec0 Hz0.0 dBmV
6Not LockedUnknown00 Ksym/sec0 Hz0.0 dBmV
7Not LockedUnknown00 Ksym/sec0 Hz0.0 dBmV
8Not LockedUnknown00 Ksym/sec0 Hz0.0 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
1Locked0 ,1 ,2 ,3159702000000 Hz-5.9 dBmV39.3 dB1126 ~ 2969120536736207476650
2Not Locked000 Hz0 dBmV0.0 dB0 ~ 4095000

 

Upstream OFDMA Channels
Channel Lock Status Modulation / Profile ID Channel ID Frequency Power
1Not Locked000 Hz0 dBmV
2Not Locked000 Hz0 dBmV

 

Current System Time:Fri Aug 05 16:02:37 2022
System Up Time:01:02:13
Message 5 of 10
smgillespie28
Aspirant

Re: CM1150V and AC1600 connection problems

So one basic question is - for devices plugged into the CM1150V e-net ports  - does the modem act at the DHCP server or is that managed upstream somewhere controlled by xfinity?     That's my guess as to where things are failing.

 

Message 6 of 10
Kitsap
Master

Re: CM1150V and AC1600 connection problems

You should have only one Ethernet connection to your CM1050V and that is your router.  Your router provides DHCP services for the devices connected to your LAN.  That includes both via Wi-Fi and Ethernet connections.  Your router should be configured to enable  "Use Router as DHCP Server."

Message 7 of 10
smgillespie28
Aspirant

Re: CM1150V and AC1600 connection problems

You should have only one Ethernet connection to your CM1050V and that is your router. Your router provides DHCP services for the devices connected to your LAN.

 

Yes I know that's how it should work and that the modem only supports one device connected directly.   But the router is not getting connected when it's that one device.  While the computer when attached directly to the modem is connecting fine.   Which brings me back to the last question.  Where is the router supposed to get it's IP address from when it's the one device connected to the modem.  From the modem - or somewhere further upstream?

 

If memory serves, I don't think this is new (the router not getting an IP address through some upstream DHCP server).  I think I previously had the router setup to use a static IP address as a work around.   Xfinity doesn't really support static IP addresses so maybe something about the storm made the old static ip invalid.

 

Message 8 of 10
Kitsap
Master

Re: CM1150V and AC1600 connection problems

 


@smgillespie28 wrote:

Which brings me back to the last question.  Where is the router supposed to get it's IP address from when it's the one device connected to the modem.  From the modem - or somewhere further upstream?

 


Further upstream, in my R7800 configuration, Advanced -> Setup -> Internet Setup it shows Internet IP Address - Get Dynamically from ISP.  See attached.  I have IPv6 enabled and configured as Pass Through.

 

If you have not done so, power down your modem and disconnect both the coax and power cord.  Then power down your router and disconnect the power cord.  Wait several minutes, connect the coax to the modem, then the power cord and allow it start and stabilize.  You can see when the leds are stable.  Now connect the power cord to the router and allow it to boot up and stabilize.  The servers at the ISP that assign IP addresses are not always fast and they vary from area to area.  I have seen them take ten to fifteen minutes to assign the IP address to a router.

 

Connecting different devices to the modem via an Ethernet connection without rebooting the modem will not often result in an instant change.  The same for making changes with the GUI, you may need to restart your system from scratch (see above) for the changes to take effect.

 

Message 9 of 10
smgillespie28
Aspirant

Re: CM1150V and AC1600 connection problems

Thanks I appreciate the help - but I've "restarted from scratch" more times than I can count.   The R6260 never worked well with the CM1150V (or maybe never worked well with the xfinity service).  I decided it's time for it to go away.  I don't want to fight with it any more.

 

And since it's pretty much impossible to get a non-wireless router on short notice, and I didn't want to risk getting another wireless router that couldn't connect through the CM1150V, I decided to replace the CM1150V with a Moto MT7711.   I don't need the wireless router included in the modem - but I do need the built in router capability which the CM1150V didn't have.    Not sure what the point was of having 4 ports if only one device could be connected.  If nothing else, it certainly was misleading when I initially bought it.

 

Funny thing is, since I was curious - the R6260 couldn't connect to the MT7711 either.  Fortunately, the R6400 could even though it also couldn't connect to the xfinity service through the CM1150V.

 

Again, thanks for trying.

 

Message 10 of 10
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