There were no firewall changes for quite a while really and IPv6
configuration hasn't been touched for quite a while either and if you
have ruled out the igmp_snooping as a source of error then thats a bit
confusing.
OpenWrt switched from using kernel-mode IPv6 RA handling (SLAAC) to
handling RAs in userspace some time after the AA release that means you
need to have a proto=dhcpv6 interface section in /etc/config/network for
using IPv6 SLAAC (in forwarding mode) as is done in the default
configuration of OpenWrt.
Alternatively you might set the sysctl value to accept RAs in forwarding
mode but this is greatly discouraged and might cause some issues with
other parts of OpenWrt.
Cheers,
Steven
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