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MaxNormLookupMemory

HKLM\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters

Data type

Range

Default value

REG_DWORD

0x0 | 0x1–0xFFFFFFFE ( bytes ) | 0xFFFFFFFF

(Varies with the system and amount of physical memory on the computer. See description.)

Description

Determines the maximum amount of system memory that TCP can allocate for the routing table and its data.

Value

Meaning

0x0

There is no TCP routing table.

0x1–0xFFFFFFFE

Specifies the maximum amount of system memory that can be allocated to the TCP routing table.

0xFFFFFFFF

There is no limit on the amount of system memory that TCP can allocate to the TCP routing table.

The default value for this entry is determined both by the amount of physical memory on the computer when TCP/IP starts and by the version of Windows running on the computer, as shown in the following table:

Amount of physical memory

Windows 2000 Server

Windows 2000 Professional

Less than 19 MB

0x25800 (150 KB = 1,000 routes)

0x25800 (150 KB = 1,000 routes)

19–63 MB

0x180000 (1.5 MB = 10,000 routes)

64 MB or more

0x500000 (5 MB = 40,000 routes)

Note Image Note

Windows 2000 does not add this entry to the registry. You can add it by editing the registry or by using a program that edits the registry.

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