What are the block page delivery options for Invisible Mode?

If the end user is not be able to receive the block page and if the R3000 is in Invisible Mode, one thing to try would be to switch between Block Page delivery methods. In the GUI, they are listed under System > Mode > Operation Mode. The R3000 Default is to use the "Send Block to Specified Host MAC Address" delivery method which always uses the MAC address of a specified host and that's usually the R3000 gateway, but if the end users are not receiving the Block Page,  then the Global Administrator can select instead the "Send Block Page via ARP Table" delivery method instead, where the ARP table will be used to determine the destination MAC address.