Bind Caching Nameserver <was: Re: [CentOS] Caching nameserver --Name Services Cache Daemon (nscd)>

[William Warren]

NOds I have been doing that..:)  I am not a windows newb..i am a linux 
newb though..:)

*that being said i do not consider myself a windows guru though*

Bryan J. Smith wrote:
 > Windows NT5+ (2000+) client systems have a _flawed_,
 > _default_ logic to "hold down" DNS resolution upon failure. That 
means if a DNS resolution fails, Windows clients will
 > _not_ requery the server _until_ that timeout passes.  There
 > is a registry hack to change this as follows:  [ From 
http://www.winguides.com/registry/display.php/1203/ ]
 >
 >   'To change the DNS cache timeout for negative responses
 >    (where a lookup failed).
 >    Windows 2000 - Create or modify the DWORD value called
 >    "NegativeCacheTime".
 >    Windows XP and .NET Server 2003 - Create or modify the
 >    DWORD value called "MaxNegativeCacheTtl".
 >    Set the value to equal the required timeout in seconds
 >    the default is 300 (5 minutes).
 >    Restart Windows for the changes to take effect.'
 >
 > It's my #1 recommendation until you resolve the problem.
 > UNIX clients/resolvers _never_ (AFAIK) cache a "failure,"
 > only Windows -- which I think is flawed, but there is a
 > reason for it (that has to do with legacy SMB file/print).
 >
 > Regardless of what solution you come to on the server,
 > consider doing the above.


Just to add to your knowledge base:

On Windows system, you can manually flush its dns cache, failed and 
otherwise, by opening a Command Window and typing:

ipconfig /flushdns


-- 
My "Foundation" verse:
Isa 54:17  No weapon that is formed against thee shall prosper; and 
every tongue that shall rise against thee in judgment thou shalt 
condemn. This is the heritage of the servants of the LORD, and their 
righteousness is of me, saith the LORD.

-- carpe ductum -- "Grab the tape"
CDTT (Certified Duct Tape Technician)

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