final IPv4NetworkLayer netLayer =
(IPv4NetworkLayer) NetUtils.getNLM().getNetworkLayer(EthernetConstants.ETH_P_IP);
final ICMPProtocol icmpProtocol =
(ICMPProtocol) netLayer.getProtocol(ICMPProtocol.IPPROTO_ICMP);
icmpProtocol.addListener(this);
try {
int id_count = 0;
int seq_count = 0;
while (this.count != 0) {
out.format(fmt_ping, dst, seq_count);