how to fix Multi cast MAC address

When I tried to use Chromecast 2 's MAC id on MAC filtering page, it refused to accept saying that the entered value is a multicast MAC addresss. I use an iBall router. Any idea how to fix this issue ?
 
.Multicast MAC addresses are the MAC addresses start with 0100:5e . MAC address has 48 bits and consist of vendor code and host code. But for one MAC address, only the last 23 bits of that MAC address is used to provide multicast MAC address. The first 25 is fixed .
 
Back
Top