MaxNormLookupMemory

HKLM\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters

Data typeRangeDefault value
REG_DWORD 0x0 | 0x1 - 0xFFFFFFFE bytes | 0xFFFFFFFF (Varies with the system and amount of physical memory on the computer. See below.)

Description

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

ValueMeaning
0x0No TCP routing table.
0x1 - 0xFFFFFFFESpecifies the maximum amount of system memory that can be allocated to the TCP routing table.
0xFFFFFFFFThere 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 by the amount of physical memory on the computer when TCP/IP starts and the version of the Windows running on the computer, as shown in the following table.

Default value of MaxNormLookupMemory
Amount of physical memory on the computer Windows 2000 ServerWindows 2000 Professional
Less than 19 MB 0x25800 (150 KB = 1,000 routes) 0x25800 (150 KB = 1,000 routes)
19 - 63 MB0x180000 (1.5 MB = 10,000 routes)
64 MB or more0x500000 (5 MB = 40,000 routes)