[FS#253] Multicast over wireless ceases to work properly after a while on ath9k with many clients connected

[LEDE Bugs]

The following task has a new comment added:

FS#253 - Multicast over wireless ceases to work properly after a while on ath9k with many clients connected
User who did this - Linus Lüssing (T-X)

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One more thing which popped into my mind, after you mentioned multiple SSIDs:

For the client devices having this issue, are more than one SSID entered in the network manager of those devices? Could it be that the issue occurs after a client device roams from one SSID to another?

There are some known issues involving roaming devices and snooping switches inside the Linux IPv6 code. See the patch I just submitted to the Linux netdev mailinglist for details: https://patchwork.ozlabs.org/patch/723428/

(However these issues should(tm) be temporary, things should recover with the next MLD query and you mentioned it does not recover even after a couple of minutes. Nevertheless, we should probably check whether your issue somehow involves roaming.)
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More information can be found at the following URL:
https://bugs.lede-project.org/index.php?do=details&task_id=253#comment1565