PPP_HDRLEN        288 net/atm/pppoatm.c 	pvcc->chan.mtu = atmvcc->qos.txtp.max_sdu - PPP_HDRLEN -
PPP_HDRLEN        490 net/irda/irnet/irnet_ppp.c   ap->chan.mtu = (2048 - TTP_MAX_HEADER - 2 - PPP_HDRLEN);
PPP_HDRLEN        493 net/irda/irnet/irnet_ppp.c   ap->mru = (2048 - TTP_MAX_HEADER - 2 - PPP_HDRLEN);