MIB_TCPSTATS2 structure (tcpmib.h)

The MIB_TCPSTATS2 structure contains statistics for the TCP protocol running on the local computer. This structure is different from MIB_TCPSTATS structure in that it uses 64-bit counters, rather than 32-bit counters.

Syntax

typedef struct _MIB_TCPSTATS2 {
  TCP_RTO_ALGORITHM RtoAlgorithm;
  DWORD             dwRtoMin;
  DWORD             dwRtoMax;
  DWORD             dwMaxConn;
  DWORD             dwActiveOpens;
  DWORD             dwPassiveOpens;
  DWORD             dwAttemptFails;
  DWORD             dwEstabResets;
  DWORD             dwCurrEstab;
  DWORD64           dw64InSegs;
  DWORD64           dw64OutSegs;
  DWORD             dwRetransSegs;
  DWORD             dwInErrs;
  DWORD             dwOutRsts;
  DWORD             dwNumConns;
} MIB_TCPSTATS2, *PMIB_TCPSTATS2;

Members

RtoAlgorithm

dwRtoMin

Type: DWORD

The minimum RTO value in milliseconds.

dwRtoMax

Type: DWORD

The maximum RTO value in milliseconds.

dwMaxConn

Type: DWORD

The maximum number of connections. If this member is -1, the maximum number of connections is variable.

dwActiveOpens

Type: DWORD

The number of active opens. In an active open, the client is initiating a connection with the server.

dwPassiveOpens

Type: DWORD

The number of passive opens. In a passive open, the server is listening for a connection request from a client.

dwAttemptFails

Type: DWORD

The number of failed connection attempts.

dwEstabResets

Type: DWORD

The number of established connections that were reset.

dwCurrEstab

Type: DWORD

The number of currently established connections.

dw64InSegs

Type: DWORD

The number of segments received.

dw64OutSegs

Type: DWORD64

The number of segments transmitted. This number does not include retransmitted segments.

dwRetransSegs

Type: DWORD64

The number of segments retransmitted.

dwInErrs

Type: DWORD

The number of errors received.

dwOutRsts

Type: DWORD

The number of segments transmitted with the reset flag set.

dwNumConns

Type: DWORD

The number of connections that are currently present in the system. This total number includes connections in all states except listening connections.

Remarks

The GetTcpStatisticsEx2 function returns a pointer to a MIB_TCPSTATS2 structure.

This structure is defined in the Tcpmib.h header file, not in the Iprtrmib.h header file. Note that the Tcpmib.h header file is automatically included in Iprtrmib.h, which is automatically included in the Iphlpapi.h header file. The Tcpmib.h and Iprtrmib.h header files should never be used directly.

Requirements

Requirement	Value
Minimum supported client	Windows 10, version 1709 [desktop apps only]
Minimum supported server	Windows Server 2016 [desktop apps only]
Header	tcpmib.h (include Iphlpapi.h)