Please explain: Difference in blocking IPv4 and IPv6?

[DL6ER]

@Arno

Is this topic (Some domains are intermittently blocked even though they are on the whitelist ) related?

Hmm, yes, maybe. Could you add the debugging options I put in there as well and check what the FTL log says for you when this happens again?

Some domains are intermittently blocked even though they are on the whitelist

I tried to reproduce this locally but haven't been able to get the wrong/strange behavior. Please add DEBUG_QUERIES=true DEBUG_FLAGS=true to your /etc/pihole/pihole-FTL.conf and run pihole restartdns. This will put FTL into (very verbose!) debugging mode. Please provide snippets from the file /var/log/pihole-FTL.log when it works and when it doesn't