For data to be broadcast to all hosts on a specific network, all the bits in the local address part of the IP address are set to 0. There are no user commands that use the broadcast capability, although such commands, or programs, can be developed. The broadcast address can be changed temporarily by changing the broadcast parameter in the ifconfig command. Change the broadcast address permanently by using the Web-based System Manager fast path, wsm network , or the SMIT fast path smit chinet . The Internet Protocol defines the special network address, 127.0.0.1, as a local loopback address.
Hosts use local loopback addresses to send messages to themselves.
The local loopback address is set by the configuration manager during the system startup process. Local loopback is implemented in the kernel and can also be set with the ifconfig command. Loopback is invoked when the system is started.