PPTP_TIME_SCALE
ticks = howmany(remain * hz, PPTP_TIME_SCALE) + 1;
ticks = howmany(ackTimeout * hz, PPTP_TIME_SCALE);
hpriv->rtt = PPTP_TIME_SCALE / 10;
t = (pptptime_t)tv.tv_sec * PPTP_TIME_SCALE;
t += tv.tv_usec / (1000000 / PPTP_TIME_SCALE);
#define PPTP_MIN_TIMEOUT (PPTP_TIME_SCALE / 83) /* 12 milliseconds */
#define PPTP_MAX_TIMEOUT (3 * PPTP_TIME_SCALE) /* 3 seconds */
#define PPTP_MIN_ACK_DELAY (PPTP_TIME_SCALE / 500) /* 2 milliseconds */
#define PPTP_MAX_ACK_DELAY (PPTP_TIME_SCALE / 2) /* 500 milliseconds */