_PPPTUN
#define PPPTUN_SNAME _PPPTUN(1) /* set interface name (mod) */
#define PPPTUN_SINFO _PPPTUN(3) /* set multiplex ID/style */
#define PPPTUN_GINFO _PPPTUN(4) /* get multiplex ID/style */
#define PPPTUN_GNNAME _PPPTUN(5) /* get Nth interface name */
#define PPPTUN_LCLADDR _PPPTUN(6) /* set local address */
#define PPPTUN_SPEER _PPPTUN(7) /* set peer ID */
#define PPPTUN_GPEER _PPPTUN(8) /* get peer ID */
#define PPPTUN_SDATA _PPPTUN(9) /* set data channel by name */
#define PPPTUN_GDATA _PPPTUN(10) /* get data channel name */
#define PPPTUN_SCTL _PPPTUN(11) /* set control channel by name */
#define PPPTUN_GCTL _PPPTUN(12) /* get control channel name */
#define PPPTUN_DCTL _PPPTUN(13) /* remove control channel */
#define PPPTUN_SSAP _PPPTUN(14) /* set SAP value; uint_t */