Windows Dev Center

SetForwardBufferMemory method of the Win32_NetworkAdapterConfiguration class

The SetForwardBufferMemory WMI class static method is used to specify how much memory IP allocates to store packet data in the router packet queue.

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

Syntax


uint32 SetForwardBufferMemory(
  [in] uint32 ForwardBufferMemory
);

Parameters

ForwardBufferMemory [in]

Size, in bytes, of the router packet queue used to store packet data. The default value is 74240 (fifty 1480-byte packets, rounded to a multiple of 256).

Return value

Return code/valueDescription
Successful completion, no reboot required
0

Successful completion, no reboot required.

Successful completion, reboot required
1

Successful completion, reboot required.

Method not supported on this platform
64

Method not supported on this platform.

Unknown failure
65

Unknown failure.

Invalid subnet mask
66

Invalid subnet mask.

An error occurred while processing an Instance that was returned
67

An error occurred while processing an instance that was returned.

Invalid input parameter
68

Invalid input parameter.

More than 5 gateways specified
69

More than five gateways specified.

Invalid IP address
70

Invalid IP address.

Invalid gateway IP address
71

Invalid gateway IP address.

An error occurred while accessing the Registry for the requested information
72

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

Invalid domain name
73

Invalid domain name.

Invalid host name
74

Invalid host name.

No primary/secondary WINS server defined
75

No primary or secondary WINS server defined.

Invalid file
76

Invalid file.

Invalid system path
77

Invalid system path.

File copy failed
78

File copy failed.

Invalid security parameter
79

Invalid security parameter.

Unable to configure TCP/IP service
80

Unable to configure TCP/IP service.

Unable to configure DHCP service
81

Unable to configure DHCP service.

Unable to renew DHCP lease
82

Unable to renew DHCP lease.

Unable to release DHCP lease
83

Unable to release DHCP lease.

IP not enabled on adapter
84

IP not enabled on adapter.

IPX not enabled on adapter
85

IPX not enabled on adapter.

Frame/network number bounds error
86

Frame or network number bounds error.

Invalid frame type
87

Invalid frame type.

Invalid network number
88

Invalid network number.

Duplicate network number
89

Duplicate network number.

Parameter out of bounds
90

Parameter out of bounds.

Access denied
91

Access denied.

Out of memory
92

Out of memory.

Already exists
93

Already exists.

Path, file or object not found
94

Path, file, or object not found.

Unable to notify service
95

Unable to notify service.

Unable to notify DNS service
96

Unable to notify DNS service.

Interface not configurable
97

Interface not configurable.

Not all DHCP leases could be released/renewed
98

Not all DHCP leases could be released or renewed.

DHCP not enabled on adapter
100

DHCP not enabled on adapter.

Other
101–4294967295

 

Remarks

When this buffer space is filled, the router begins discarding packets at random from its queue.

Packet queue data buffers are 256 bytes in length, so the value of the ForwardBufferMemory parameter should be a multiple of 256. Multiple buffers are chained together for larger packets. The IP header for a packet is stored separately. This parameter is ignored and no buffers are allocated if the IP router is not enabled. The buffer size can range from the network Maximum Transmission Unit (MTU) to a value smaller than 0xFFFFFFFF.

Examples

The Modify the Forward Buffer Memory for All Network Adapters VBScript sample configures the forward buffer memory for all network adapters on a computer.

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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