Understanding strange firewall block logs originating from LANs
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https://doc.pfsense.org/index.php/Why_do_my_logs_show_%22blocked%22_for_traffic_from_a_legitimate_connection
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Some IPv6 & IPv4 multicast comming from the clients regardless of enabling IPv6.
Also out of state traffic.
https://doc.pfsense.org/index.php/Why_do_my_logs_show_%22blocked%22_for_traffic_from_a_legitimate_connection.
If you don't want to see the IPv6 stuff create an IPv6 block any any and don't log.
The default block rule logs everything.