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SetPMTUBHDetect method of the Win32_NetworkAdapterConfiguration class

The SetPMTUBHDetect WMI class static method is used to enable the detection of Black Hole routers while doing Path MTU Discovery.

This topic uses Managed Object Format (MOF) syntax. For more information about using this method, see Calling a Method.

Syntax


uint32 SetPMTUBHDetect(
  boolean PMTUBHDetectEnabled
);

Parameters

PMTUBHDetectEnabled

If true, TCP attempts to discover Black Hole and route packets in different network paths.

Return value

Return codeDescription
0

Successful completion, no reboot required.

1

Successful completion, reboot required.

64

Method not supported on this platform.

65

Unknown failure.

66

Invalid subnet mask.

67

An error occurred while processing an instance that was returned.

68

Invalid input parameter.

69

More than five gateways specified.

70

Invalid IP address.

71

Invalid gateway IP address.

72

An error occurred while accessing the registry for the requested information.

73

Invalid domain name.

74

Invalid host name.

75

No primary or secondary WINS server defined.

76

Invalid file.

77

Invalid system path.

78

File copy failed.

79

Invalid security parameter.

80

Unable to configure TCP/IP service.

81

Unable to configure DHCP service.

82

Unable to renew DHCP lease.

83

Unable to release DHCP lease.

84

IP not enabled on adapter.

85

IPX not enabled on adapter.

86

Frame or network number bounds error.

87

Invalid frame type.

88

Invalid network number.

89

Duplicate network number.

90

Parameter out of bounds.

91

Access denied.

92

Out of memory.

93

Already exists.

94

Path, file, or object not found.

95

Unable to notify service.

96

Unable to notify DNS service.

97

Interface not configurable.

98

Not all DHCP leases could be released or renewed.

100

DHCP not enabled on adapter.

 

Remarks

A Black Hole router does not return the Internet Control Message Protocol (ICMP) Destination Unreachable messages when it needs to fragment an IP datagram with the Don't Fragment bit set. TCP depends on receiving these messages to perform Path MTU Discovery.

With this feature enabled, TCP will try to send segments without the Don't Fragment bit set if several retransmissions of a segment go unacknowledged. If the segment is acknowledged as a result, the maximum segment size (MSS) will be decreased and the Don't Fragment bit will be set in future packets on the connection. Enabling black hole detection increases the maximum number of retransmissions performed for a given segment.

Examples

The Modify PMTUBH Detection on All Network Adapters enables the auto-discovery of black hole routers when determining the maximum transmission unit on a network.

Requirements

Minimum supported client

Windows Vista

Minimum supported server

Windows Server 2003

Namespace

\root\CIMV2

MOF

CIMWin32.mof

DLL

CIMWin32.dll

See also

Computer System Hardware Classes
Win32_NetworkAdapterConfiguration
WMI Tasks: Networking
WMI Tasks: Accounts and Domains
IPv6 and IPv4 Support in WMI

 

 

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