ecco qua l'errore esatto che fa il pppd Jun 28 14:37:44 localhost pppd[2921]: Serial connection established. Jun 28 14:37:44 localhost pppd[2921]: ioctl(PPPIOCGFLAGS): Invalid argument Jun 28 14:37:44 localhost pppd[2921]: Hangup (SIGHUP) Jun 28 14:37:44 localhost pppd[2921]: Exit.