NP_IP             548 net/if_ppp.c   	    npx = NP_IP;
NP_IP             742 net/if_ppp.c   	mode = sc->sc_npmode[NP_IP];
NP_IP             905 net/if_ppp.c   	    mode = sc->sc_npmode[NP_IP];
NP_IP            1513 net/if_ppp.c   	    || sc->sc_npmode[NP_IP] != NPMODE_PASS) {