MPPE_HEADER_BITMASK
mop->cohnum &= ~MPPE_HEADER_BITMASK;
if ((prefix & MPPE_HEADER_BITMASK) != MPPE_ENCRYPTED) {
(prefix & MPPE_HEADER_BITMASK) | flushed);
prefix &= ~MPPE_HEADER_BITMASK;
mip->cohnum &= ~MPPE_HEADER_BITMASK;
mip->cohnum &= ~MPPE_HEADER_BITMASK;