On Jan 20, 2013, at 12:23 AM, "Keith Medcalf" <kmedc...@dessus.com> wrote:

> 
>> Just an FYI...
>> 
>> Every version of Windows since Windows 2000 (sans Windows Me) has had
>> the DNS Client service which maintained this caching function. This was
>> by design due to the massive dependency on DNS resolution which Active
>> Directory has had since its creation. It greatly reduced the amount of
>> repetitive lookups required thereby speeding up AD based functions and
>> lessening the load on DNS servers. It still exists today up through
>> Windows 8. You can disable the service, but it will also break DDNS
>> updates unless your DHCP server registers hostnames on behalf of your
>> clients.
>> 
>> - -Vinny
> 
> DDNS updates (including WINS registrations), static updates, and Active 
> Directory registrations are handled by the DHCPClient service since Windows 
> 95 through all versions of client and server since.  The DNSClient handles 
> caching (in a method somewhat akin a very broken caching-only nameserver) 
> only.  You can disable the DNSClient service with no ill effect at all 
> (actually, it will probably improve things significantly, if you have a local 
> non-Windows caching recursive DNS to use).  You cannot disable the DHCPClient 
> service, however, without breaking DDNS updates, static configuration, and 
> Active Directory.
> 

You know, that's how I remembered it too, but I went to verify that before I 
posted and found different information so I thought I remembered wrong. Since 
you've affirmed my first instinct I'll retract what I said about DDNS and 
concur with your statement.

DDNS in Windows didn't exist before Windows 2000 (as AD also didn't), and Win9x 
operating systems didn't have services as I recall it, though. Admittedly, I 
thankfully haven't used a Win9x OS in a very long time.

-Vinny


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