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1994-02-23
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DOCUMENT:Q111670 22-FEB-1994 [W_NTAS]
TITLE :ArpCacheSize Defaults to 62 Entries
PRODUCT :Microsoft Windows NT Advanced Server
PROD/VER:3.10
OPER/SYS:WINDOWS
KEYWORDS:
--------------------------------------------------------------
The information in this article applies to:
- Microsoft Windows NT Advanced Server version 3.1
--------------------------------------------------------------
SYMPTOMS
========
A Windows NT server may not be able to maintain reliable connections to a
large number of active TCP/IP clients.
CAUSE
=====
The default ArpCacheSize is set to 62 entries. The ArpCache maintains a
mapping between IP and machine addresses, so the size should be adjusted to
accommodate the number of active clients. Otherwise the oldest entries will
be purged and then address resolution protocol (ARP) will be used to re-
obtain the mappings when they're needed.
RESOLUTION
==========
You can adjust the ArpCacheSize by using the following procedure:
WARNING: Using Registry Editor incorrectly can cause serious, system-wide
problems that may require you to reinstall Windows NT to correct them.
Microsoft cannot guarantee that any problems resulting from the use of
Registry Editor can be solved. Use this tool at your own risk.
1. Start Registry Editor.
2. Select the HKEY_LOCAL_MACHINE on Local Machine window.
3. Go to the SYSTEM\CurrentControlSet\Services\tcpip\parameters key.
4. Create a new value of type REG_DWORD named ArpCacheSize.
5. Set it for the highest number of clients that is likely to be
active at one time.
Additional reference words: 3.10
KBCategory:
KBSubCategory: pertune
=============================================================================
THE INFORMATION PROVIDED IN THE MICROSOFT KNOWLEDGE BASE IS
PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND. MICROSOFT DISCLAIMS
ALL WARRANTIES, EITHER EXPRESS OR IMPLIED, INCLUDING THE WARRANTIES
OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN NO
EVENT SHALL MICROSOFT CORPORATION OR ITS SUPPLIERS BE LIABLE FOR
ANY DAMAGES WHATSOEVER INCLUDING DIRECT, INDIRECT, INCIDENTAL,
CONSEQUENTIAL, LOSS OF BUSINESS PROFITS OR SPECIAL DAMAGES, EVEN IF
MICROSOFT CORPORATION OR ITS SUPPLIERS HAVE BEEN ADVISED OF THE
POSSIBILITY OF SUCH DAMAGES. SOME STATES DO NOT ALLOW THE EXCLUSION
OR LIMITATION OF LIABILITY FOR CONSEQUENTIAL OR INCIDENTAL DAMAGES
SO THE FOREGOING LIMITATION MAY NOT APPLY.
Copyright Microsoft Corporation 1994.