1#!/usr/bin/python 2# 3 4from topology import * 5 6T = Topology() 7net1 = Network(T,"udp0") 8echo = Host(T, net1, args="udpecho:172.16.1.2:7770:7770:1400:") 9 10 11sleep(1) 12raw_input("Press enter to continue ...") 13 14start(T) 15wait(echo) 16cleanup() 17