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SetPMTUDiscovery method of the Win32_NetworkAdapterConfiguration class

The SetPMTUDiscovery WMI class static method is used to enable Maximum Transmission Unit (MTU) discovery over the path to a remote host.

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

Syntax


uint32 SetPMTUDiscovery(
  boolean PMTUDiscoveryEnabled
);

Parameters

PMTUDiscoveryEnabled

If true, TCP is enabled to attempt to discover the Maximum Transmission Unit (MTU) or largest packet size over the path to a remote host. The default is true.

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

By discovering the Path MTU and limiting TCP segments to this size, TCP can eliminate fragmentation at routers along the path that connect networks with different MTUs. Fragmentation adversely affects TCP throughput and network congestion. Setting this parameter to FALSE causes an MTU of 576 bytes to be used for all connections that are not to machines on the local subnet

Examples

The Enable PMTU Discovery on all Network Adapters VBScript sample enables a computer to automatically discover 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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