++ printf("usage: %s [-b] [[-c number] [-e 0|1] [-p 0|1] [-s num] [-a [itf.]vpi.vci]*]*\n"
++ " -b = run in background (daemonize)\n"
++ " -c <num> = use interface nas<num>\n"
++ " -e 0|1 = encapsulation (0=LLC, 1=VC Mux)\n"
++ " -p 0|1 = payload type (0=routed,1=bridged)\n"
++ " -s <num> = set sndbuf (send buffer) size (default 8192)\n"
++ " -a [itf.]vpi.vci = ATM interface no, VPI, VCI\n",