Most DNS clients cache the results of name
resolution requests. This speeds up name resolution if multiple lookups
are done to the same address, such as is common when browsing the web.
C:\>ipconfig /flushdns
Windows IP Configuration
Successfully flushed the DNS Resolver Cache.
You can also use the command ipconfig /displaydns to view the DNS resolver cache.
Turning off DNS Caching under Microsoft Windows
================================
If you experience frequent issues with DNS caching under Microsoft
Windows, you can disable client-side DNS caching with either of these
two commands:
* net stop dnscache
* sc servername stop dnscache
This will disable DNS caching until the next reboot. To make the change
permanent, use the Service Controller tool or the Services tool to set
the DNS Client service startup type to Disabled.
Tuning on DNS Caching under Microsoft Windows
===============================
You can modify the behavior of the Microsoft Windows DNS caching
algorithm by setting two registry entries in the
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Dnscache\Parameters
registry key.
The MaxCacheTtl represents the maximum time that the results of a DNS
lookup will be cached. The default value is 86,400 seconds. If you set
this value to 1, DNS entries will only be cashed for a single second.
MaxNegativeCacheTtl represents the maximim time that the results of a
failed DNS lookup will be cached. The default value is 900 seconds. If
you set this value to 0, failed DNS lookups will not be cached.
How to Flush DNS in Mac OSX
===================
In Mac OSX Leopard, you can use the command dnscacheutil -flushcache to flush the DNS resolver cache:
bash-2.05a$ dnscacheutil -flushcache
In Mac OSX versions 10.5.1 and before, the command lookupd -flushcache performed the same task:
bash-2.05a$ lookupd -flushcache
How to Flush DNS in Linux
=================
In Linux, the nscd daemon manages the DNS cache.
To flush the DNS cache, restart the nscd daemon.
To restart the nscd daemon, use the command `/etc/init.d/nscd restart`.
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