Hi,@anamehere 
Thank you for posting on our business forum.

We would like to kindly confirm the intended outcome you aim to achieve with your ACL configuration. To clarify, are you looking to block all traffic from the WAN2 port from entering your LAN?

Since NAT is not implemented for IPv6, Omada gateways block external network access to your internal network by default. Please check whether you have configured the Permit rules, and confirm that the IPv6 Group_Any includes all IPv6 addresses.

You may refer to the guidance for how to configure the IPv6 ACL via the link below: How to configure IPv6 Access Control on Omada Gateway | Omada Network Support

If you still encounter issues after completing the above checks, please kindly provide the following detailed information to help us assist you further:
1.The intended objective you wish to achieve via the ACL configuration
2.Full specific details of your current ACL configuration
3.Whether you are using a controller to manage your device
4.The topology of your network.