SC_PKTLOST
sc->sc_flags |= SC_PKTLOST; /* note the dropped packet */
sc->sc_flags |= SC_PKTLOST;
ppppktin(sc, pkt, sc->sc_flags & SC_PKTLOST);
if (sc->sc_flags & SC_PKTLOST) {
sc->sc_flags &= ~SC_PKTLOST;