An IP Directed broadcast gives the sender the capability to send a packet and broadcast it to the entire network. An example of a network broadcast address for the classful network ID 140.101.0.0/16 is 140.101.255.255. When Cisco introduced this command in IOS version 10.0, they did not realize the ramifications of enabling directed broadcasts which enabled

Continue reading Preventing Smurf attacks by stopping IP directed broadcasts