[FS#2791] IPv6 router advertisments lost after upgrade to 19.07

[OpenWrt Bugs]

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The following task has a new comment added:

FS#2791 - IPv6 router advertisments lost after upgrade to 19.07
User who did this - cryptage21 (cryptage21)

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Hi,

Hi,

I have a similar problem but with the same cause.

I'm using IPv6 with SLAAC on a Xiaomi R3P router.
OpenWRT version is 19.07.4.

Just after starting Wifi everything is good on clients (Android, Windows...).
After 10 minutes IPv6 is not working anymore. Devices don't receive RAs and can't get IPv6 connectivity.

If Wifi is restarted everything is working for 10 min.

The problem is with GTK rekeying (wpa_group_key in hostapd).
If I change it to an higher value it's working until the value expires. 

For example, with "3600" clients work for 1 hour.

Could you please try to correct this bug ? 
It is particularly annoying and it prevents using IPv6.

Thanks


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More information can be found at the following URL:
https://bugs.openwrt.org/index.php?do=details&task_id=2791#comment8984

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