Orbi WiFi 7 RBE973
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Re: Nighthawk R6700v2 losing connection to CM700 Modem

Thompa3642
Tutor

Nighthawk R6700v2 losing connection to CM700 Modem

Hi there,

We are relatively new Comcast Xfinity custmers and decided to buy our own Modem (CM700) and Router (Nighthawk R6700v2).

Every morning we find that our computers are disconnected from the internet (DNS Server error), although the Comcast Home Security system is connected through our Modem... and I can access the Internet on my phone when the computers show they are disconnected, however.

Each morning, I have manually reset the modem. Today, however, I reset the router instead and the system came back up... which suggests the problem is with the router.

I have been told Comcast send updates around midnight every day... and thought this might be causing the modem/routers issues...

Can anyone advise on how I would investigate the issue with the router?

 

Thanks in anticipation,

Allan

 

Message 1 of 16

Accepted Solutions
Thompa3642
Tutor

Re: Nighthawk R6700v2 losing connection to CM700 Modem

Hi there,

Wanted to update this thread....

Since I downloaded and installed the latest firmware for the R6700 to V1.2.0.12_1.0.1, 4 days ago, my disconnection issues in the mornings has evaporated!

I know it is early days... but the update seems to have worked!

Thank you for doing this!

Made our lives much easier!

Regards,

Allan Thompson

View solution in original post

Model: R6700v2|Nighthawk AC1750 Smart WiFi Router
Message 16 of 16

All Replies
mbradley3
Aspirant

Re: Nighthawk R6700v2 losing connection to CM700 Modem

I am having the same issues.  The only difference is that we have a motorola surfboard modem.  Would love some help too.

Message 2 of 16
JamesGL
Master

Re: Nighthawk R6700v2 losing connection to CM700 Modem

Hi All,

 

If the router has no connection, bypass the router and check if the modem has internet without rebooting it.

Message 3 of 16
JamesGL
Master

Re: Nighthawk R6700v2 losing connection to CM700 Modem

Hi All,

 

We’d greatly appreciate hearing your feedback letting us know if you need further assistance.

Message 4 of 16
Thompa3642
Tutor

Re: Nighthawk R6700v2 losing connection to CM700 Modem

Hi there,

Thanks for replying - we are away from home at the moment..

Yes, bypassing the router and using just the modem, gives us access to the internet

 Hoping this helps!

regards,

Allan

Message 5 of 16
JamesGL
Master

Re: Nighthawk R6700v2 losing connection to CM700 Modem

Hi Thompa3642,

 

May I know what is the firmware version of the router? Make sure it is updated. (https://kb.netgear.com/000038706/R6700v2-Firmware-Version-1-1-0-34)

 

 

Message 6 of 16
Thompa3642
Tutor

Re: Nighthawk R6700v2 losing connection to CM700 Modem

Hi there,

Yes - updated to the latest firmware.

 

Allan

Message 7 of 16
JamesGL
Master

Re: Nighthawk R6700v2 losing connection to CM700 Modem

Hi Thompa3642,

 

Please check your inbox.

Message 8 of 16
TheWorstPing
Apprentice

Re: Nighthawk R6700v2 losing connection to CM700 Modem

which surfboard are you using?

Message 9 of 16
Thompa3642
Tutor

Re: Nighthawk R6700v2 losing connection to CM700 Modem

Sorry - don't understand - what do you mean by 'surfboard'?

Message 10 of 16
TheWorstPing
Apprentice

Re: Nighthawk R6700v2 losing connection to CM700 Modem

which modem..

Message 11 of 16
Thompa3642
Tutor

Re: Nighthawk R6700v2 losing connection to CM700 Modem

There is a Netgear CM700 modem and Comcast supplied a Netgear modem for their security system.

Message 12 of 16
eligia
Aspirant

Re: Nighthawk R6700v2 losing connection to CM700 Modem

Sub'd for updates. 

Message 13 of 16
Thompa3642
Tutor

Re: Nighthawk R6700v2 losing connection to CM700 Modem

Hi Again,

Sadly after being away for a few months we returned home to our home and found we are still experiencing the same issues... each morning I have to reset the system to reconnect to the internet..

 

I immediately checked to see whether there were any firmware updates... to make sure I was running the latest.

I have investigated and am bemused by what I found...

Some wireless and wired devices are disconnected from the imrenet... but some remain connected.

My phone remains connected and I can happily browse the internet, read emails etc. but my wife's Chromebook is disconnected.

I rebooted the modem (CM700) and this had no effect on the connected devices.

Had to reboot the R6700v2 and this reconnected us to the Internet.

Checking the log on the R6700v2:

[DoS attack: ACK Scan] from source: 31.13.67.11:443 Sunday, December 10,2017 11:12:53        
[DHCP IP: (192.168.1.15)] to MAC address 44:61:32:08:40:37 Sunday, December 10,2017 11:12:38   (Thermostat)  
[DoS attack: ACK Scan] from source: 192.241.185.248:443 Sunday, December 10,2017 11:12:25        
[DoS attack: ACK Scan] from source: 104.154.164.197:443 Sunday, December 10,2017 11:12:05        
[admin login] from source 192.168.1.10 Sunday, December 10,2017 11:11:50        
[DHCP IP: (192.168.1.15)] to MAC address 44:61:32:08:40:37 Sunday, December 10,2017 11:11:38        (Thermostat)
[DoS attack: ACK Scan] from source: 52.39.177.168:443 Sunday, December 10,2017 11:11:09        
[DHCP IP: (192.168.1.15)] to MAC address 44:61:32:08:40:37 Sunday, December 10,2017 11:10:37        (Thermostat)
[DoS attack: ACK Scan] from source: 192.241.185.248:443 Sunday, December 10,2017 11:10:25        
[DoS attack: ACK Scan] from source: 104.154.164.197:443 Sunday, December 10,2017 11:10:04        
[DoS attack: ACK Scan] from source: 34.228.163.174:443 Sunday, December 10,2017 11:09:43        
[UPnP set event:AddPortMapping] from source 192.168.1.36 Sunday, December 10,2017 11:09:39        
[DHCP IP: (192.168.1.4)] to MAC address 48:D2:24:1F:B8:49 Sunday, December 10,2017 11:09:38        (Windows laptop)
[DHCP IP: (192.168.1.15)] to MAC address 44:61:32:08:40:37 Sunday, December 10,2017 11:09:36        (Thermostat)
[DoS attack: ACK Scan] from source: 62.254.26.207:993 Sunday, December 10,2017 11:09:29        
[DoS attack: ACK Scan] from source: 52.39.177.168:443 Sunday, December 10,2017 11:09:08        
[DoS attack: ACK Scan] from source: 74.125.139.188:5228 Sunday, December 10,2017 11:08:46        
[DHCP IP: (192.168.1.21)] to MAC address E0:46:9A:44:42:31 Sunday, December 10,2017 11:08:34        (xfinity Security modem)
[DHCP IP: (192.168.1.15)] to MAC address 44:61:32:08:40:37 Sunday, December 10,2017 11:08:34        (Thermostat)
[DoS attack: ACK Scan] from source: 62.254.26.207:993 Sunday, December 10,2017 11:08:21        
[DHCP IP: (192.168.1.15)] to MAC address 44:61:32:08:40:37 Sunday, December 10,2017 11:07:34        (Thermostat)
[DoS attack: ACK Scan] from source: 62.254.26.207:993 Sunday, December 10,2017 11:07:21        
[DoS attack: ACK Scan] from source: 13.115.29.218:5223 Sunday, December 10,2017 11:07:01        
[DoS attack: ACK Scan] from source: 62.254.26.207:993 Sunday, December 10,2017 11:06:40        
[DHCP IP: (192.168.1.15)] to MAC address 44:61:32:08:40:37 Sunday, December 10,2017 11:06:33        (Thermostat)
[DoS attack: ACK Scan] from source: 65.52.108.219:443 Sunday, December 10,2017 11:06:18        
[DHCP IP: (192.168.1.19)] to MAC address F4:B7:E2:28:BC:11 Sunday, December 10,2017 11:05:59        (Printer)
[DoS attack: ACK Scan] from source: 62.254.26.207:993 Sunday, December 10,2017 11:05:57        
[DHCP IP: (192.168.1.18)] to MAC address 02:0F:B5:07:37:40 Sunday, December 10,2017 11:05:49        
[DHCP IP: (192.168.1.17)] to MAC address D0:76:58:07:A4:66 Sunday, December 10,2017 11:05:45        
[DoS attack: ACK Scan] from source: 62.254.26.207:993 Sunday, December 10,2017 11:05:37        
[UPnP set event:AddPortMapping] from source 192.168.1.4 Sunday, December 10,2017 11:05:37        
[DoS attack: ACK Scan] from source: 62.254.26.207:993 Sunday, December 10,2017 11:05:34        
[UPnP set event:AddPortMapping] from source 192.168.1.10 Sunday, December 10,2017 11:05:33        
[DoS attack: ACK Scan] from source: 54.198.88.45:3478 Sunday, December 10,2017 11:05:32        
[DHCP IP: (192.168.1.15)] to MAC address 44:61:32:08:40:37 Sunday, December 10,2017 11:05:32        (Thermostat)
[DHCP IP: (192.168.1.11)] to MAC address 00:1F:1F:22:8C:B4 Sunday, December 10,2017 11:05:28        
[DHCP IP: (192.168.1.16)] to MAC address 2C:3A:E8:26:89:86 Sunday, December 10,2017 11:05:15        
[DoS attack: ACK Scan] from source: 65.52.108.212:443 Sunday, December 10,2017 11:05:10        
[DHCP IP: (192.168.1.19)] to MAC address F4:B7:E2:28:BC:11 Sunday, December 10,2017 11:04:58        
[DHCP IP: (192.168.1.7)] to MAC address 6C:33:A9:2E:B8:71 Sunday, December 10,2017 11:04:56        
[DHCP IP: (192.168.1.7)] to MAC address 6C:33:A9:2E:B8:71 Sunday, December 10,2017 11:04:56        
[DHCP IP: (192.168.1.7)] to MAC address 6C:33:A9:2E:B8:71 Sunday, December 10,2017 11:04:56        
[DHCP IP: (192.168.1.7)] to MAC address 6C:33:A9:2E:B8:71 Sunday, December 10,2017 11:04:56        
[DHCP IP: (192.168.1.7)] to MAC address 6C:33:A9:2E:B8:71 Sunday, December 10,2017 11:04:56        
[DoS attack: ACK Scan] from source: 172.217.8.78:443 Sunday, December 10,2017 11:04:50        
[admin login] from source 192.168.1.10 Sunday, December 10,2017 11:04:44        
[UPnP set event:AddPortMapping] from source 192.168.1.9 Sunday, December 10,2017 11:04:39        
[DoS attack: ACK Scan] from source: 65.52.108.226:443 Sunday, December 10,2017 11:04:38        
[UPnP set event:AddPortMapping] from source 192.168.1.8 Sunday, December 10,2017 11:04:37        
[UPnP set event:AddPortMapping] from source 192.168.1.8 Sunday, December 10,2017 11:04:37        
[UPnP set event:AddPortMapping] from source 192.168.1.8 Sunday, December 10,2017 11:04:37        
[UPnP set event:AddPortMapping] from source 192.168.1.8 Sunday, December 10,2017 11:04:37        
[UPnP set event:AddPortMapping] from source 192.168.1.8 Sunday, December 10,2017 11:04:37        
[DHCP IP: (192.168.1.15)] to MAC address 44:61:32:08:40:37 Sunday, December 10,2017 11:04:32        
[DHCP IP: (192.168.1.15)] to MAC address 44:61:32:08:40:37 Sunday, December 10,2017 11:04:32        
[DHCP IP: (192.168.1.15)] to MAC address 44:61:32:08:40:37 Sunday, December 10,2017 11:04:32        
[DHCP IP: (192.168.1.15)] to MAC address 44:61:32:08:40:37 Sunday, December 10,2017 11:04:32        
[DHCP IP: (192.168.1.15)] to MAC address 44:61:32:08:40:37 Sunday, December 10,2017 11:04:32        
[DoS attack: ACK Scan] from source: 62.254.26.223:993 Sunday, December 10,2017 11:04:29        
[DHCP IP: (192.168.1.14)] to MAC address D0:E7:82:D6:0E:21 Sunday, December 10,2017 11:04:18        
[DHCP IP: (192.168.1.12)] to MAC address EC:1A:59:EB:9F:D5 Sunday, December 10,2017 11:04:17        
[DHCP IP: (192.168.1.6)] to MAC address 02:0F:B5:02:AF:57 Sunday, December 10,2017 11:04:15        
[DHCP IP: (192.168.1.11)] to MAC address 00:1F:1F:22:8C:B4 Sunday, December 10,2017 11:04:14        
[Time synchronized with NTP server time-a.netgear.com] Sunday, December 10,2017 11:04:13        
[DHCP IP: (192.168.1.9)] to MAC address 02:0F:B5:AA:9F:FC Sunday, December 10,2017 11:04:12        
[DoS attack: ACK Scan] from source: 192.241.185.248:443 Sunday, December 10,2017 11:04:09        
[DHCP IP: (192.168.1.11)] to MAC address 00:1F:1F:22:8C:B4 Sunday, December 10,2017 11:04:09        
[DHCP IP: (192.168.1.4)] to MAC address 48:D2:24:1F:B8:49 Sunday, December 10,2017 11:04:08        
[DHCP IP: (192.168.1.5)] to MAC address 70:4F:57:B8:D2:49 Sunday, December 10,2017 11:04:06        
[Internet connected] IP address: 73.55.27.178 Sunday, December 10,2017 11:04:06        
[DHCP IP: (192.168.1.2)] to MAC address 10:A5:D0:85:37:F3 Sunday, December 10,2017 11:04:06        
[DHCP IP: (192.168.1.20)] to MAC address A4:C4:94:79:4D:2A Sunday, December 10,2017 11:04:06        
[DHCP IP: (192.168.1.5)] to MAC address 70:4F:57:B8:D2:49 Sunday, December 10,2017 11:04:06        
[DHCP IP: (192.168.1.3)] to MAC address 00:23:A7:2B:B8:28 Sunday, December 10,2017 11:04:04       

 

Can all of the reported DoS attacks be correct?

 

Here's a grab from the CM700 just now... after I had another disconnection!

Startup Procedure
ProcedureStatusComment
Acquire Downstream Channel753000000 HzLocked
Connectivity StateOkOperational
Boot StateOkOperational
SecurityEnabledBPI+
IP Provisioning ModeHonor MDDhonorMdd(4)

Downstream Bonded Channels
ChannelLock StatusModulationChannel IDFrequencyPowerSNRCorrectablesUnCorrectables
1LockedQAM 2561591000000 Hz3.7 dBmV38.9 dB4612912
2LockedQAM 2562597000000 Hz3.9 dBmV38.9 dB5112704
3LockedQAM 2563603000000 Hz4.0 dBmV38.9 dB10812810
4LockedQAM 2564609000000 Hz4.0 dBmV38.9 dB3861757
5LockedQAM 2565615000000 Hz4.0 dBmV38.6 dB9252197
6LockedQAM 2566621000000 Hz4.0 dBmV38.6 dB6061639
7LockedQAM 2567627000000 Hz4.0 dBmV38.9 dB3201527
8LockedQAM 2568633000000 Hz3.7 dBmV38.9 dB5022461
9LockedQAM 2569639000000 Hz3.7 dBmV38.9 dB4902528
10LockedQAM 25610645000000 Hz3.7 dBmV38.9 dB6981281
11LockedQAM 25611651000000 Hz3.5 dBmV38.9 dB5731390
12LockedQAM 25612657000000 Hz3.4 dBmV38.9 dB4122753
13LockedQAM 25613663000000 Hz3.5 dBmV38.6 dB6161484
14LockedQAM 25614669000000 Hz3.5 dBmV38.6 dB4781741
15LockedQAM 25615675000000 Hz3.4 dBmV38.9 dB4351838
16LockedQAM 25616681000000 Hz3.2 dBmV38.6 dB3101565
17LockedQAM 25617687000000 Hz3.0 dBmV38.9 dB6292650
18LockedQAM 25618693000000 Hz3.0 dBmV38.9 dB5681466
19LockedQAM 25619699000000 Hz3.0 dBmV38.6 dB6751348
20LockedQAM 25620705000000 Hz2.9 dBmV38.6 dB5042576
21LockedQAM 25621711000000 Hz2.7 dBmV38.6 dB4632857
22LockedQAM 25622717000000 Hz2.2 dBmV37.6 dB6812395
23LockedQAM 25623723000000 Hz1.7 dBmV38.6 dB8212442
24LockedQAM 25624729000000 Hz0.9 dBmV37.9 dB153705
25LockedQAM 25625735000000 Hz0.2 dBmV37.6 dB276671
26LockedQAM 25626741000000 Hz-0.2 dBmV37.3 dB303732
27LockedQAM 25627747000000 Hz-1.0 dBmV36.9 dB351845
28LockedQAM 25628753000000 Hz-1.7 dBmV36.6 dB7944698
29Not LockedN/AN/A0 Hz0.0 dBmV0.0 dB00
30Not LockedN/AN/A0 Hz0.0 dBmV0.0 dB00
31Not LockedN/AN/A0 Hz0.0 dBmV0.0 dB00
32Not LockedN/AN/A0 Hz0.0 dBmV0.0 dB00

Upstream Bonded Channels
ChannelLock StatusUS Channel TypeChannel IDSymbol RateFrequencyPower
1LockedATDMA45120 Ksym/sec16600000 Hz43.0 dBmV
2LockedATDMA35120 Ksym/sec23000000 Hz42.3 dBmV
3LockedATDMA25120 Ksym/sec29400000 Hz41.5 dBmV
4LockedATDMA15120 Ksym/sec35800000 Hz41.0 dBmV
5Not LockedN/AUnknown0 Ksym/sec0 Hz0.0 dBmV
6Not LockedN/AUnknown0 Ksym/sec0 Hz0.0 dBmV
7Not LockedN/AUnknown0 Ksym/sec0 Hz0.0 dBmV
8Not LockedN/AUnknown0 Ksym/sec0 Hz0.0 dBmV

 

Hope someone can help us!

Regards,

Allan

Message 14 of 16
Thompa3642
Tutor

Re: Nighthawk R6700v2 losing connection to CM700 Modem

Interesting thsi morning.... using my phone on the internet while my wife could not get an internet connection.... she was not happy... but that isn't the point!

When I checked my phone wif connection. I was connected to the 5G signal and she was not. I changed my phone's wifi to connect to the 2.4Ghz signal and immediately was told there was no internet connection. Weird!

 

Does this help anyone analyse why I still have to reset the R6700v2 every morning?

Very desparate for a solution now... will be nuying another router in the January sales!

Model: R6700v2|Nighthawk AC1750 Smart WiFi Router
Message 15 of 16
Thompa3642
Tutor

Re: Nighthawk R6700v2 losing connection to CM700 Modem

Hi there,

Wanted to update this thread....

Since I downloaded and installed the latest firmware for the R6700 to V1.2.0.12_1.0.1, 4 days ago, my disconnection issues in the mornings has evaporated!

I know it is early days... but the update seems to have worked!

Thank you for doing this!

Made our lives much easier!

Regards,

Allan Thompson

Model: R6700v2|Nighthawk AC1750 Smart WiFi Router
Message 16 of 16
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