Have found an issue if using the DNS filter as well as IPv6.
If the router is providing DNS the filter blocks v6 access to DNS on the device itself (on the input chain) where it should only be on the forward chain.
This can be seen by checking:
ip6tables -t mangle -L
It makes sense blocking FORWARD but should not be blocking INPUT when the router is the destination set in the filter settings.
Device is an ASUS RT-AC68U...
DNS Filter Issue
If the router is providing DNS the filter blocks v6 access to DNS on the device itself (on the input chain) where it should only be on the forward chain.
This can be seen by checking:
ip6tables -t mangle -L
It makes sense blocking FORWARD but should not be blocking INPUT when the router is the destination set in the filter settings.
Device is an ASUS RT-AC68U...
DNS Filter Issue