Hi Rene, i understand what we use the ARP broadcost (FF:FF:FF:FF:FF:FF:), but i have one question. When we take for example this subnet : 1.1.1.1/30, the IP 1 to 2 are for devices, the 0 define the subnet and the last .3 is defined as broadcast IP. What is the utility of this boadcast IP ? Can you help to understand ?