Forum Discussion

bsomanlol's avatar
bsomanlol
Joining in
2 months ago

Daily intermittent dropouts on VM Broadband

Hi All,

I am having regular daily dropouts on my home network for all devices where they lose access to the internet for a few moments. Some devices then need re-setting up again to work with internet services regularly.

Looking at my router status, I can see Pre-RS Errors but no Post-RS errors and a healthy SNR:

Channel Locked Status RxMER (dB) Pre RS Errors Post RS Errors

1Locked40.31880
2Locked38.9480
3Locked40.31380
4Locked40.3420
5Locked40.3330
6Locked40.3980
7Locked40.3620
8Locked40.31990
9Locked40.3470
10Locked40.3850
11Locked40.3940
12Locked40.94320
13Locked40.3750
14Locked40.9950
15Locked40.91920
16Locked40.9710
17Locked40.33140
18Locked40.31970
19Locked40.31700
20Locked40.93070
21Locked40.31490
22Locked40.31040
23Locked40.31610
24Locked40.31500

Upstream however, I do see incrementing TS Timeouts (granted small numbers here):

Channel Channel Type T1 Timeouts T2 Timeouts T3 Timeouts T4 Timeouts

       1     ATDMA       0         0          2       0
       2     ATDMA       0       0          1       0
       3     ATDMA       0       0          2       0
       4     ATDMA       0       0          1       0
       5     ATDMA       0       0          2       0

I do not see daily log errors for the issue but I do see some ranging response critical errors and some DHCP renewal errors:

31/12/2024 15:49:41criticalNo Ranging Response received - T3 time-out;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
31/12/2024 12:43:20ErrorDHCP RENEW WARNING - Field invalid in response v4 option;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
28/12/2024 23:51:26criticalNo Ranging Response received - T3 time-out;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
28/12/2024 00:43:20ErrorDHCP RENEW WARNING - Field invalid in response v4 option;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
24/12/2024 16:57:28criticalNo Ranging Response received - T3 time-out;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;

I se a number of other forum posts that seem to be a similar issue which has varied responses, but some mentioned a requirement to replace the router:

https://community.virginmedia.com/t5/Networking-and-WiFi/Errors-No-Ranging-Response-received-T3-time-out-and-separate-T4/td-p/5338859/page/3

Can someone please help me work through it as it's driving us mad every time we're in the middle of loading a show to watch or need to google something.

Thanks,

B

Broadband
Dropouts
ranging-errors
t3
  • Adduxi's avatar
    Adduxi
    Very Insightful Person
    2 months ago

    You can ignore those log entries as that’s the way the Hub reports the WAN DHCP leasing. The other stats look okay and with no PostRS errors the circuit should be good. 
    If the dropouts are only WIFI  I would suggest you disable the Smart Optimisation and manually set the channel bands avoiding DFS channels on the 5Ghz band and setting the 2.4Ghz to either channel 1, 6 or 11

    • bsomanlol's avatar
      bsomanlol
      Joining in
      6 days ago

      Thanks Adduxi, sorry I only got around to this now!

      That could be interesting as I had a quick read and it said DFS could be affected by radar systems and I live relatively close to a lot of military airbases, so could be related perhaps?

      Either way, I have set 2.4GHz to channel 6 and 5GHz to channel 44 as I think that's outside of DFS channel range. Will report back :)