MaxCacheTtl
Applies To: Windows Server 2003, Windows Server 2003 R2, Windows Server 2003 with SP1, Windows Server 2003 with SP2
HKLM\SYSTEM\CurrentControlSet\Services\DNS\Parameters
| Data type | Range | Default value |
|---|---|---|
REG_DWORD |
0x0 | 0x1–0xFFFFFFFF seconds |
0x15180 (86,400 seconds = 1 day) |
Description
Specifies how long the Domain Name System (DNS) server can save a record of a recursive name query.
If the value of this entry is 0x0, then the DNS server does not save any records.
The DNS server saves the records of recursive name queries in a memory cache so that it can respond quickly to new queries for the same name. Records are deleted from the cache periodically to keep the cache content current. The interval during which the records remain in the cache usually is determined by the value of the Time to Live (TTL) field in the record. This entry establishes the maximum time that records can remain in the cache. The DNS server deletes records from the cache when the value of this entry expires, even if the value of the TTL field in the record is greater.
Change Method
To change the value of this entry, use Dnscmd.exe, a tool included in Windows Support Tools. The change is effective immediately; you do not have to restart the DNS server.
Activation Method
DNS reads its registry entries only when it starts. If you change the value of this entry by editing the registry, then the changes are not effective until you restart the DNS server.
Notes
This entry does not affect Windows Internet Name Service (WINS) data saved in the DNS memory cache. WINS data is saved until the Cache Timeout Value on the WINS record expires. To view or change the Cache Timeout Value on the WINS record, use the DNS snap-in. Right-click a zone name, click Properties, click the WINS tab, and then click the Advanced button.
This entry does not exist in the registry by default. You can add it by using the registry editor Regedit.exe.