The RASDEVICETYPE type enumeration defines the different device types on the RRAS server.

 typedef enum _RASDEVICETYPE
 {
   RDT_Modem = 0,
   RDT_X25,
   RDT_Isdn,
   RDT_Serial,
   RDT_FrameRelay,
   RDT_Atm,
   RDT_Sonet,
   RDT_Sw56,
   RDT_Tunnel_Pptp,
   RDT_Tunnel_L2tp,
   RDT_Irda,
   RDT_Parallel,
   RDT_Other,
   RDT_PPPoE,
   RDT_Tunnel_Sstp,
   RDT_Tunnel_Ikev2,
   RDT_Tunnel = 0x00010000,
   RDT_Direct = 0x00020000,
   RDT_Null_Modem = 0x00040000,
   RDT_Broadband = 0x00080000
 } RASDEVICETYPE;

RDT_Modem: Modem device

RDT_X25: X.25 device

RDT_Isdn: ISDN device

RDT_Serial: Serial port device

RDT_FrameRelay: Frame relay device

RDT_Atm: Asynchronous transfer mode (ATM) device

RDT_Sonet: Sonet device

RDT_Sw56: Switched 56K access device

RDT_Tunnel_Pptp: PPTP device

RDT_Tunnel_L2tp: L2TP device

RDT_Irda: Infrared Data Association (IrDA) device.

RDT_Parallel: Parallel port device.

RDT_Other: Any other device.

RDT_PPPoE: PPPoE device.<10>

RDT_Tunnel_Sstp: SSTP device.<11>

RDT_Tunnel_Ikev2: IKEv2 device.<12>

RDT_Tunnel: Specifies the tunnel device class like PPTP, L2TP, SSTP, IKEv2.

RDT_Direct: Specifies the direct device class like Serial, Parallel.

RDT_Null_Modem: Specifies modem device class like Modem, Isdn, Irda.

RDT_Broadband: Specifies broadband device class like PPPoE.<13>

The final four values (RDT_Tunnel, RDT_Direct, RDT_Null_Modem, RDT_Broadband) are used to specify the class of the device.