U

Monday, January 13th, 2025 9:06 PM

New XB7 - losing internet multiple times a day

Hello everyone, last resort post...

I had my own Motorola modem with a google Wi-Fi router  and I had ZERO issues for years.  I had to rent an Xfinity Gateway (I received an XB7 which is compatible with my 500mbps plan) last month.  I installed it during the holidays and I had issues getting my google Wi-Fi router to work successfully, it would drop the connection every 10 mins; and yes I did configure the XB7 for bridged mode.  After back and forth via Xfinity App with AI support, and a chat support agent with no luck I just gave up on the idea of my own router and kept just the XB7. 

All seemed well until went back to work.  I work from home and I noticed my corp vpn dropping multiple times an hour, very disruptive.  While my vpn is disconnected I can ping 8.8.8.8 but I can't browse, pages wont load.  As soon as I see my vpn auto reconnecting that's when I know I have internet again and I can browse pages.  I've also noticed this while watching TV (YouTube TV) where the video stops and then comes back.  Same on mobile app, watching a video on YouTube or social media and the videos stop playing, after 30 seconds everything is back to normal.  My webcams at home also stop working, they randomly freeze and then come back.  Lastly my wifi printer - I get notification on my laptop (Windows) that connectivity to printer is lost.  Last Friday via chat I asked for a replacement modem but I am afraid same issue will happen.  This seems to be an xfinity service situation.

I've done the basic troubleshooting of rebooting and either AI or real 'support' agents checking my service and wifi remotely - all comes clean and they point the finger at the corp vpn which worked flawlessly with my own equipment.

I've reached out to IT and escalated vpn client logs to manufacturer support and there is nothing wrong with the client - they just notice that internet stopped working therefore the client disconnects.

So I am stuck between paying stupid money for overage or working with unreliable internet.

This is the info on the Xfinity gateway:

HW Version:10
Vendor:ARRIS Group, Inc.
BOOT Version:4.2.28.668728
Core Version:dunfell
Model:TG4482A
Product Type:XB7
Flash Part:4857 MB

Note the light on the modem is solid white when I lose connectivity, it does not power cycle since it would take longer.  there are no splitters in place, from outside box, to a hole in the wall and straight into my modem.

Here's the Downtream info

Channel ID
20
28
36
44
13
14
15
16
17
18
19
21
22
23
24
25
26
27
29
30
31
32
33
34
35
37
38
39
40
41
42
43
0
0
193
194
Lock Status
Locked
Locked
Locked
Locked
Locked
Locked
Locked
Locked
Locked
Locked
Locked
Locked
Locked
Locked
Locked
Locked
Locked
Locked
Locked
Locked
Locked
Locked
Locked
Locked
Locked
Locked
Locked
Locked
Locked
Locked
Locked
Locked
 
 
Locked
Locked
Frequency
5.01E+08
5.49E+08
5.97E+08
6.45E+08
4.59E+08
4.65E+08
4.71E+08
4.77E+08
4.83E+08
4.89E+08
4.95E+08
5.07E+08
5.13E+08
5.19E+08
5.25E+08
5.31E+08
5.37E+08
5.43E+08
5.55E+08
5.61E+08
5.67E+08
5.73E+08
5.79E+08
5.85E+08
5.91E+08
6.03E+08
6.09E+08
6.15E+08
6.21E+08
6.27E+08
6.33E+08
6.39E+08
 
 
6.93E+08
9.6E+08
SNR
40.94621
40.94621
43.37659
40.36629
40.94621
44.62598
43.37659
43.37659
43.37659
40.94621
40.94621
40.94621
43.37659
43.37659
43.37659
40.36629
40.94621
40.94621
43.37659
40.94621
40.36629
40.94621
40.94621
40.36629
40.94621
40.94621
40.94621
40.94621
40.36629
39.39719
40.36629
40.36629
 
 
45.11 dB
43.67 dB
Power Level
5.300003
4.699997
4.800003
5.400002
4.5
4.599998
5
5.099998
4.900002
4.900002
5.099998
5.300003
5.5
5.099998
4.699997
4.400002
4.400002
4.599998
4.900002
4.900002
4.800003
4.5
4.300003
4.5
4.800003
4.5
4.400002
4.5
4.599998
4.599998
4.699997
5
 
 
5.900002 dBmV
6.000000 dBmV
Modulation
QAM256
QAM256
QAM256
QAM256
QAM256
QAM256
QAM256
QAM256
QAM256
QAM256
QAM256
QAM256
QAM256
QAM256
QAM256
QAM256
QAM256
QAM256
QAM256
QAM256
QAM256
QAM256
QAM256
QAM256
QAM256
QAM256
QAM256
QAM256
QAM256
QAM256
QAM256
QAM256
 
 
OFDM
OFDM

The Upstream info

Channel ID
17
20
19
18
43
Lock Status
Locked
Locked
Locked
Locked
Locked
Frequency
16400000
35600000
29200000
22800000
39900000-84275000
Symbol Rate
5120 KSym/sec
5120 KSym/sec
5120 KSym/sec
5120 KSym/sec
0 KSym/sec
Power Level
45.5206
46.0206
45.7706
45.5206
55.18263
Modulation
64QAM
64QAM
64QAM
64QAM
OFDMA
Channel Type
US_TYPE_ATDMA
US_TYPE_ATDMA
US_TYPE_ATDMA
US_TYPE_ATDMA
US_TYPE_OFDMA

the CM Error Codewords

CM Error Codewords
Channel ID

20

28

36

44

13

14

15

16

17

18

19

21

22

23

24

25

26

27

29

30

31

32

33

34

35

37

38

39

40

41

42

43

0

0

Unerrored Codewords

8.6E+08

8.59E+08

8.59E+08

8.59E+08

8.59E+08

8.59E+08

8.59E+08

8.59E+08

8.59E+08

8.59E+08

8.59E+08

8.59E+08

8.59E+08

8.59E+08

8.59E+08

8.59E+08

8.59E+08

8.59E+08

8.59E+08

8.59E+08

8.59E+08

8.59E+08

8.59E+08

8.59E+08

8.59E+08

8.59E+08

8.59E+08

8.59E+08

8.59E+08

8.59E+08

8.59E+08

8.59E+08

0

0

Correctable Codewords

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

Uncorrectable Codewords

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

12 Messages

1 day ago

Do you get these same firewall logs? This is causing all sorts of the same problems you mentioned for me.

3 Messages

@user_w2ou6r​ 

I took this screenshot as the issue was happening today 2025/1/13 @ 16:37.   You see the vpn disconnected message and therefore no internet whatsoever during that time.

Comparing to your screenshot I do have the FW.IPv6 FOWARD drop but also an FW.IPv6 INPUT drop and MAC addresses (devices) being blocked.  Is this a denial of service attack?

3 Messages

14 hours ago

@EG I dont know if you're still around but I see you were very involved in other posts.  Can you help shed some light on this or maybe get some really smart comcast\xfinity escalating support engineer

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