133. More DNS Tweaks

Failed DNS lookups get cached and to prevent it from occurring, we have to change
following three registry keys under the hive:

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\ Dnscache\ Parameters

Now create or modify the DWORD key named NegativeCacheTime and set its value to
0(zero) .The default value is 300 seconds. This key determines how long an entry for a
negative answer remains in DNS cache.

Create or modify the DWORD key NetFailureCacheTime and set the value as 0 (zero). The
default is 30 seconds. It determines for how long the DNS client stops sending queries when
the network is not responding.

Create or modify the DWORD key NegativeSOACacheTime and set the value as 0(zero).
The default value I think is 120 seconds. This key determines how long an entry for a
negative answer to a query for an SOA remains in the Domain Name System (DNS) cache.