You are connecting to a router and configuring ACLs through the web interface. Which plane are you affecting?

When you configure access control lists (ACLs) through any interface, you are affecting the control plane. This is because you are controlling the flow of data with the ACL. You are accessing the router through the management plane when you are connected to either the web interface or the command-line interface (CLI). The data plane is what you are controlling with the control plane. The data plane is the actual flow of information.