PPP_PROJECTION_INFO2 structure (mprapi.h)

Article
09/01/2022

Contains information obtained during Point-to-Point (PPP) negotiation for Secure Socket Tunneling Protocol (SSTP), Point-to-Point Tunneling Protocol (PPTP), and Layer 2 Tunneling Protocol (L2TP).

Syntax

typedef struct _PPP_PROJECTION_INFO2 {
  DWORD   dwIPv4NegotiationError;
  WCHAR   wszAddress[IPADDRESSLEN + 1];
  WCHAR   wszRemoteAddress[IPADDRESSLEN + 1];
  DWORD   dwIPv4Options;
  DWORD   dwIPv4RemoteOptions;
  ULONG64 IPv4SubInterfaceIndex;
  DWORD   dwIPv6NegotiationError;
  BYTE    bInterfaceIdentifier[8];
  BYTE    bRemoteInterfaceIdentifier[8];
  BYTE    bPrefix[8];
  DWORD   dwPrefixLength;
  ULONG64 IPv6SubInterfaceIndex;
  DWORD   dwLcpError;
  DWORD   dwAuthenticationProtocol;
  DWORD   dwAuthenticationData;
  DWORD   dwRemoteAuthenticationProtocol;
  DWORD   dwRemoteAuthenticationData;
  DWORD   dwLcpTerminateReason;
  DWORD   dwLcpRemoteTerminateReason;
  DWORD   dwLcpOptions;
  DWORD   dwLcpRemoteOptions;
  DWORD   dwEapTypeId;
  DWORD   dwEmbeddedEAPTypeId;
  DWORD   dwRemoteEapTypeId;
  DWORD   dwCcpError;
  DWORD   dwCompressionAlgorithm;
  DWORD   dwCcpOptions;
  DWORD   dwRemoteCompressionAlgorithm;
  DWORD   dwCcpRemoteOptions;
} PPP_PROJECTION_INFO2, *PPPP_PROJECTION_INFO2;

Members

dwIPv4NegotiationError

A value that specifies the result of PPP IPv4 Network control protocol negotiation. A value of 0 indicates IPv4 has been negotiated successfully. A nonzero value indicates failure, and also represents the fatal error that occurred during the control protocol negotiation.

wszAddress[IPADDRESSLEN + 1]

A null-terminated Unicode string that specifies the IPv4 address of the local client. This string has the form "a.b.c.d". The wszAddress member is valid only if dwIPv4NegotiationError is 0.

wszRemoteAddress[IPADDRESSLEN + 1]

An array that contains a Unicode string that specifies the IPv4 address of the remote server. This string has the form "a.b.c.d". The wszRemoteAddress member is valid only if the dwIPv4NegotiationError member is zero. If the address is not available, this member is an empty string.

dwIPv4Options

A value that specifies IPCP options for the local client.

Value	Meaning
PPP_IPCP_VJ	Indicates that IP datagrams sent by the local client are compressed using Van Jacobson compression.

dwIPv4RemoteOptions

A value that specifies IPCP options for the remote server.

Value	Meaning
PPP_IPCP_VJ	Indicates that IP datagrams sent by the remote server (that is, received by the local computer) are compressed using Van Jacobson compression.

IPv4SubInterfaceIndex

A value that specifies the IPv4 subinterface index corresponding to the connection on the server.

dwIPv6NegotiationError

A value that specifies the result of PPP IPv6 Network control protocol negotiation. A value of zero indicates Ipv6 has been negotiated successfully. A nonzero value indicates failure, and is the fatal error that occurred during the control protocol negotiation.

bInterfaceIdentifier[8]

An array that specifies the 64-bit IPv6 interface identifier of the client. The last 64 bits of a 128-bit IPv6 internet address are considered the interface identifier, which provides a strong level of uniqueness for the preceding 64 bits. The bInterfaceIdentifier member must not be 0 and is valid only if the dwIPv6NegotiationError member is 0.

bRemoteInterfaceIdentifier[8]

An array that specifies the 64-bit IPv6 interface identifier of the server. The last 64 bits of a 128-bit IPv6 internet address are considered the interface identifier, which provides a strong level of uniqueness for the preceding 64 bits. The bInterfaceIdentifier member must not be 0 and is valid only if the dwIPv6NegotiationError member is 0.

bPrefix[8]

A value that specifies the client interface IPv6 address prefix.

dwPrefixLength

A value that specifies the length, in bits, of the bPrefix member.

IPv6SubInterfaceIndex

A value that specifies the IPv6 subinterface index corresponding to the connection on the server.

dwLcpError

A value that specifies the result of PPP LCP negotiation. A value of zero indicates LCP has been negotiated successfully. A nonzero value indicates failure and represents the fatal error that occurred during the control protocol negotiation.

dwAuthenticationProtocol

A value that specifies the authentication protocol used to authenticate the local client. This member can be one of the following values.

Value	Meaning
PPP_LCP_PAP	Password Authentication Protocol
PPP_LCP_CHAP	Challenge Handshake Authentication Protocol
PPP_LCP_EAP	Extensible Authentication Protocol

dwAuthenticationData

A value that specifies additional information about the authentication protocol specified by the dwAuthenticationProtocol member. This member can be one of the following values.

Value	Meaning
PPP_LCP_CHAP_MD5	MD5 CHAP
PPP_LCP_CHAP_MS	Microsoft CHAP
PPP_LCP_CHAP_MSV2	Microsoft CHAP version 2

dwRemoteAuthenticationProtocol

A value that specifies the authentication protocol used to authenticate the remote server. The dwAuthenticationProtocol member and the dwRemoteAuthenticationProtocol member will differ when demand dial uses different authentication protocols on the client and server. This member can be one of the following values.

Value	Meaning
PPP_LCP_PAP	Password Authentication Protocol
PPP_LCP_CHAP	Challenge Handshake Authentication Protocol
PPP_LCP_EAP	Extensible Authentication Protocol

dwRemoteAuthenticationData

A value that specifies additional information about the authentication protocol specified by the dwRemoteAuthenticationProtocol member. The dwAuthenticationData member and the dwRemoteAuthenticationData member will differ when demand dial uses different authentication protocols on the client and server. This member can be one of the following values.

Value	Meaning
PPP_LCP_CHAP_MD5	MD5 CHAP
PPP_LCP_CHAP_MS	Microsoft CHAP
PPP_LCP_CHAP_MSV2	Microsoft CHAP version 2

dwLcpTerminateReason

Not Implemented. Must be 0.

dwLcpRemoteTerminateReason

Not Implemented. Must be 0.

dwLcpOptions

A value that specifies information about LCP options in use by the local client. This member is a combination of the following flags.

Value	Meaning
PPP_LCP_MULTILINK_FRAMING	The connection is using multilink.
PPP_LCP_PFC	The connection is using Protocol Field Compression.
PPP_LCP_ACFC	The connection is using Address and Control Field Compression.
PPP_LCP_SSHF	The connection is using Short Sequence Number Header Format.
PPP_LCP_DES_56	The connection is using DES 56-bit encryption.
PPP_LCP_3_DES	The connection is using Triple DES Encryption.
PPP_LCP_AES_128	The connection is using 128-bit AES Encryption.
PPP_LCP_AES_256	The connection is using 256-bit AES Encryption.

dwLcpRemoteOptions

A value that specifies information about LCP options in use by the remote server. This member is a combination of the following flags.

Value	Meaning
PPP_LCP_MULTILINK_FRAMING	The connection is using multilink.
PPP_LCP_PFC	The connection is using Protocol Field Compression.
PPP_LCP_ACFC	The connection is using Address and Control Field Compression.
PPP_LCP_SSHF	The connection is using Short Sequence Number Header Format.
PPP_LCP_DES_56	The connection is using DES 56-bit encryption.
PPP_LCP_3_DES	The connection is using Triple DES Encryption.
PPP_LCP_AES_128	The connection is using 128-bit AES Encryption.
PPP_LCP_AES_256	The connection is using 256-bit AES Encryption.

dwEapTypeId

A value that specifies the type identifier of the Extensible Authentication Protocol (EAP) used to authenticate the local client. The value of this member is valid only if the dwAuthenticationProtocol member is PPP_LCP_EAP.

dwEmbeddedEAPTypeId

A value that specifies the type identifier of the inner EAP method used in the EAP authentication. The value of this member is valid only if the dwEapTypeId member is set to PEAP defined in IANA-EAP.

dwRemoteEapTypeId

A value that specifies the type identifier of the Extensible Authentication Protocol (EAP) used to authenticate the remote server. The value of this member is valid only if the dwRemoteAuthenticationProtocol member is PPP_LCP_EAP.

dwCcpError

A value that specifies the result of PPP CCP negotiation. A value of 0 indicates CCP has been negotiated successfully. A nonzero value indicates failure, and represents the fatal error that occurred during the control protocol negotiation.

dwCompressionAlgorithm

A value that specifies the compression algorithm used by the local client. The following table shows the possible values for this member.

Value	Meaning
RASCCPCA_MPPC	Microsoft Point-to-Point Compression (MPPC) Protocol.
RASCCPCA_STAC	STAC option 4.

dwCcpOptions

A value that specifies the compression types available on the local client. The following types are supported.

Value	Meaning
PPP_CCP_COMPRESSION	Compression without encryption.
PPP_CCP_HISTORYLESS	Microsoft Point-to-Point Encryption (MPPE) in stateless mode. The session key is changed after every packet. This mode improves performance on high latency networks, or networks that experience significant packet loss.
PPP_CCP_ENCRYPTION40BITOLD	MPPE compression using 40-bit keys.
PPP_CCP_ENCRYPTION40BIT	MPPE compression using 40-bit keys.
PPP_CCP_ENCRYPTION56BIT	MPPE compression using 56-bit keys.
PPP_CCP_ENCRYPTION128BIT	MPPE compression using 128-bit keys.

The last three options are used when a connection is made over Layer 2 Tunneling Protocol (L2TP), and the connection uses IPSec encryption.

dwRemoteCompressionAlgorithm

A value that specifies the compression algorithm used by the remote server. The following algorithms are supported.

Value	Meaning
RASCCPCA_MPPC	Microsoft Point-to-Point Compression (MPPC) Protocol.
RASCCPCA_STAC	STAC option 4.

dwCcpRemoteOptions

A value that specifies the compression types available on the remote server. The following types are supported.

Value	Meaning
PPP_CCP_COMPRESSION	Compression without encryption.
PPP_CCP_HISTORYLESS	Microsoft Point-to-Point Encryption (MPPE) in stateless mode. The session key is changed after every packet. This mode improves performance on high latency networks, or networks that experience significant packet loss.
PPP_CCP_ENCRYPTION40BITOLD	MPPE compression using 40-bit keys.
PPP_CCP_ENCRYPTION40BIT	MPPE compression using 40-bit keys.
PPP_CCP_ENCRYPTION56BIT	MPPE compression using 56-bit keys.
PPP_CCP_ENCRYPTION128BIT	MPPE compression using 128-bit keys.
ERROR_PPP_NOT_CONVERGING	The remote computer and RRAS could not converge on address negotiation.

The last three options are used when a connection is made over Layer 2 Tunneling Protocol (L2TP), and the connection uses IPSec encryption.

Requirements

Requirement	Value
Minimum supported client	None supported
Minimum supported server	Windows Server 2012 [desktop apps only]
Header	mprapi.h

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PPP_PROJECTION_INFO2 structure (mprapi.h)

Syntax

Members

Requirements

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