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TCP_ESTATS_OBS_REC_ROD_v0 structure (tcpestats.h)

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The TCP_ESTATS_OBS_REC_ROD_v0 structure contains read-only dynamic information for extended TCP statistics observed on the remote receiver for a TCP connection.

Syntax

typedef struct _TCP_ESTATS_OBS_REC_ROD_v0 {
  ULONG CurRwinRcvd;
  ULONG MaxRwinRcvd;
  ULONG MinRwinRcvd;
  UCHAR WinScaleRcvd;
} TCP_ESTATS_OBS_REC_ROD_v0, *PTCP_ESTATS_OBS_REC_ROD_v0;

Members

CurRwinRcvd

Type: ULONG

The most recent window advertisement, in bytes, received from the remote receiver.

MaxRwinRcvd

Type: ULONG

The maximum window advertisement, in bytes, received from the remote receiver.

MinRwinRcvd

Type: ULONG

The minimum window advertisement, in bytes, received from the remote receiver.

WinScaleRcvd

Type: ULONG

The value of the received window scale option if one was received from the remote receiver; otherwise, a value of -1.

Note that if both the WinScaleSent member of the TCP_ESTATS_REC_ROD_v0 structure and the WinScaleRcvd member are not -1, then Snd.Wind.Scale will be the same as this value and used to scale receiver window announcements from the remote host to the local host.

Remarks

The TCP_ESTATS_OBS_REC_ROD_v0 structure is used as part of the TCP extended statistics feature available on Windows Vista and later.

The TCP_ESTATS_OBS_REC_ROD_v0 is defined as version 0 of the structure for read-only dynamic information for extended TCP statistics on the local receiver for a TCP connection. This information is available after the connection has been established.

The TCP_ESTATS_OBS_REC_ROD_v0 structure is retrieved by calls to the GetPerTcp6ConnectionEStats or GetPerTcpConnectionEStats functions when TcpConnectionEstatsObsRec is passed in the EstatsType parameter. Extended TCP statistics need to be enabled to retrieve this structure.

The members of this structure are defined in the IETF RFC on the TCP Extended Statistics MIB. For more information, see http://www.ietf.org/rfc/rfc4898.txt.

The following is the mapping of the members in the TCP_ESTATS_OBS_REC_ROD_v0 structure to the entries defined in RFC 4898 for extended TCP statistics:

Term Description
CurRwinRcvd tcpEStatsPerfCurRwinRcvd
MaxRwinRcvd tcpEStatsPerfMaxRwinRcvd
MinRwinRcvd No mapping to this member.
WinScaleRcvd tcpEStatsStackWinScaleRcvd

Requirements

Requirement Value
Minimum supported client Windows Vista [desktop apps only]
Minimum supported server Windows Server 2008 [desktop apps only]
Header tcpestats.h

See also

GetPerTcp6ConnectionEStats

GetPerTcpConnectionEStats

TCP_ESTATS_TYPE