NoteHKLM\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters
| Data type | Range | Default value |
|---|---|---|
| REG_DWORD | 0x0 - 0xFFFFFFFF seconds | 0x78 (120 seconds = 2 minutes) |
Determines how long an unreferenced entry can remain in the Address Resolution Protocol (ARP) cache table. Entries cannot remain in the table longer than specified by the value of this entry. However, entries can be removed sooner if the table space they occupy is needed to store a new entry.
By default, ArpCacheLife applies to unreferenced entries. The duration of referenced entries is determined by the value of ArpCacheMinReferencedLife, which is 10 minutes, by default. However, referenced entries must remain in the table at least as long as unreferenced entries. Therefore, if the value of ArpCacheLife is greater than or equal to the value of ArpCacheMinReferencedLife (10 minutes), then the value of ArpCacheLife is used for both referenced and unreferenced entries.
Note
This value does not affect ARP cache table entries that are added manually. TCP/IP does not remove manual entries.
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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