1 ip:::send (args[2]: 4 64, args[4]: 4 84 0 0 255) 1 ip:::send (args[2]: 4 64, args[4]: 4 84 0 0 255) 2 ip:::receive (args[2]: 4 64, args[4]: 4 84 0 0 255) 2 ip:::receive (args[2]: 4 64, args[4]: 4 84 0 0 255) 127.0.0.1 is alive