The Internet Protocol requires every network interface controller to be assigned at least one unique IP address.
Groups of machines with similar addresses are considered to be part of the same logical subnet.
To resolve this, a UDP helper address is established in the router configuration to forward broadcast network traffic outside the local subnet.
To disable the forwarding of broadcast packets to specific addresses, use the no form of this command.
Since these ports are used by NetBIOS to help determine network configuration the added broadcasts can confuse the system.