fprintf(stderr," \t%s [options] -n ip port external_port protocol [duration]\n\t\tAdd (any) port redirection allowing IGD to use alternative external_port (for IGD:2 only)\n",argv[0]);
fprintf(stderr," \t%s [options] -n ip port external_port protocol [duration] [remote host]\n\t\tAdd (any) port redirection allowing IGD to use alternative external_port (for IGD:2 only)\n",argv[0]);
fprintf(stderr," \t%s [options] -N external_port_start external_port_end protocol [manage]\n\t\tDelete range of port redirections (for IGD:2 only)\n",argv[0]);
fprintf(stderr," \t%s [options] -r port1 [external_port1] protocol1 [port2 [external_port2] protocol2] [...]\n\t\tAdd all redirections to the current host\n",argv[0]);