We all know broadcast address . It is the address used to address all in the same LAN ( Local Area network).
In broadcast we have two types : Limited broadcast and Directed broadcast. What is the difference between the directed broadcast and the Limited broadcast ?
Limited broadcast is the broadcast limited to a single LAN and which is to be received by all. It is sent to reserved Class E , IP address 255.255.255.255. The destination MAC address for such frames will be FF:FF:FF:FF:FF:FF. The router simply drop the Limited broadcast address and does not forward it.
Directed Broadcast address is the local subnet broadcast address. If the subnet is 192.168.10.0 , the directed broadcast address will be 192.168.10.255 , which will be heard by all in the same subnet hosts. The router will receive such packet and process it.The destination mac address will still be FF:FF:FF:FF:FF:FF, as it is to be received by all hosts.
DHCP packets are Limited broadcast packets and NBNS uses directed broadcast packets.
Limited broadcast is the broadcast limited to a single LAN and which is to be received by all. It is sent to reserved Class E , IP address 255.255.255.255. The destination MAC address for such frames will be FF:FF:FF:FF:FF:FF. The router simply drop the Limited broadcast address and does not forward it.
Directed Broadcast address is the local subnet broadcast address. If the subnet is 192.168.10.0 , the directed broadcast address will be 192.168.10.255 , which will be heard by all in the same subnet hosts. The router will receive such packet and process it.The destination mac address will still be FF:FF:FF:FF:FF:FF, as it is to be received by all hosts.
DHCP packets are Limited broadcast packets and NBNS uses directed broadcast packets.
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