Random disconnects requiring router reset.

[max49]

Every couple of hours the internet will disconnect from all devices, sometimes for ~30 seconds, sometimes until the router is reset. The CPU usage jumps from ~5-15 to ~80+, the logs are always mentioning drop_caches: 3,   and also repeatedly says DHCP old event, DHCP lease change. Here are some logs that might be useful.

Mon Jan 25 14:00:00 2021 kern.info kernel: [63557.125288] ash (17242): drop_caches: 3 Mon Jan 25 14:00:00 2021 cron.err crond[1404]: USER root pid 17242 cmd echo 3 > /proc/sys/vm/drop_caches Mon Jan 25 13:55:00 2021 kern.info kernel: [63257.065901] ash (12456): drop_caches: 3 Mon Jan 25 13:55:00 2021 cron.err crond[1404]: USER root pid 12456 cmd echo 3 > /proc/sys/vm/drop_caches Mon Jan 25 13:50:00 2021 kern.info kernel: [62956.989914] ash (10708): drop_caches: 3 Mon Jan 25 13:50:00 2021 cron.err crond[1404]: USER root pid 10708 cmd echo 3 > /proc/sys/vm/drop_caches Mon Jan 25 13:45:00 2021 kern.info kernel: [62656.934078] ash (9431): drop_caches: 3 Mon Jan 25 13:45:00 2021 cron.err crond[1404]: USER root pid 9431 cmd echo 3 > /proc/sys/vm/drop_caches Mon Jan 25 13:41:01 2021 daemon.notice hostapd: wlan1: AP-STA-DISCONNECTED a8:1d:16:31:70:a9 Mon Jan 25 13:40:00 2021 kern.info kernel: [62356.876471] ash (8035): drop_caches: 3 Mon Jan 25 13:40:00 2021 cron.err crond[1404]: USER root pid 8035 cmd echo 3 > /proc/sys/vm/drop_caches Mon Jan 25 13:35:00 2021 kern.info kernel: [62056.813951] ash (5256): drop_caches: 3 Mon Jan 25 13:35:00 2021 cron.err crond[1404]: USER root pid 5256 cmd echo 3 > /proc/sys/vm/drop_caches Mon Jan 25 13:30:00 2021 kern.info kernel: [61756.765399] ash (3369): drop_caches: 3 Mon Jan 25 13:30:00 2021 cron.err crond[1404]: USER root pid 3369 cmd echo 3 > /proc/sys/vm/drop_caches Mon Jan 25 13:25:00 2021 kern.info kernel: [61456.720483] ash (1565): drop_caches: 3 Mon Jan 25 13:25:00 2021 cron.err crond[1404]: USER root pid 1565 cmd echo 3 > /proc/sys/vm/drop_caches Mon Jan 25 13:24:40 2021 user.info com.netdumasoftware.neighwatch: DHCP lease change. Mon Jan 25 13:24:39 2021 user.info com.netdumasoftware.neighwatch: DHCP old event.

[mfoz11]

I turned off IPV6 on the WAN and fixed the same issue for me - im using virgin with superhub in modem mode.

[Netduma Liam]

Good suggestion above, try disabling IPv6 as mentioned and see how you get on!

[max49]

On 1/26/2021 at 11:57 AM, Netduma Liam said:

Good suggestion above, try disabling IPv6 as mentioned and see how you get on!

So I have turned off the iPV6 on the WAN and that seems to have stopped random disconnects, however know my logs repeatedly say "daemon.err odhcp6c[1956]: Failed to send DHCPV6 message to ff02::1:2 (Address not available)" (see logs) and its now pretty common that my internet just seems to stops loading things and not functioning properly. When I hover over the internet icon on my PC it says my WiFi is limited. 

I am using a virgin media superhub.

log-1612358080279.txt

[Netduma Fraser]

If you're not using IPv6 then those entries are fine. How are you using the V hub, is it in modem or router mode? What WiFi settings are you using on the R2?

[max49]

20 hours ago, Netduma Fraser said:

If you're not using IPv6 then those entries are fine. How are you using the V hub, is it in modem or router mode? What WiFi settings are you using on the R2?

In the WiFi tab I am using the default settings except I have split the two bands from each other. I have a couple ports forwarded for my ps4 however when I have the issues my ps4 is in standby mode. I have the V Hub setup in modem mode.

[Netduma Liam]

I have heard some reports that modem mode on VM can be a bit hit or miss, can you temporarily take it out of modem mode and see if the 'limited' message disappears in Windows?