final IPv4ConfigurationService cfg = InitialNaming.lookup(IPv4ConfigurationService.NAME);
if (argAdd.isSet()) {
cfg.addRoute(target, gateway, device, true);
} else if (argDel.isSet()) {
cfg.deleteRoute(target, gateway, device);
} else {
PrintWriter out = getOutput().getPrintWriter();
out.println(str_table);
out.println(ipNL.getRoutingTable());
}