Re: Multiple DNS server entries on Client PC

Tech-Archive recommends: Speed Up your PC by fixing your registry

From: Ziek (Pete_at_start.net)
Date: 03/23/04 

Date: Tue, 23 Mar 2004 09:18:54 -0500

Is there any way in hell that the client didn't even attempt to use DNS #1?

For instance, let's say I reboot the machine, so everything is fresh. And
then I try to go to an internal website (one which the ISP's DNS would know
nothign about).

If I ping this host and get "no reply", and after doing a network trace , I
see that it attempted to resolve this host name by asking DNS #4, should I
assume that it *did* try DNS #1/2/and 3, but #4 answered sooner than the
first three, even through the first three are internal??!

"Ace Fekay [MVP]"
<PleaseSubstituteMyActualFirstName&LastNameHere@hotmail.com> wrote in
message news:uSpCfiHEEHA.2628@TK2MSFTNGP11.phx.gbl...
> In news:OggArQFEEHA.3236@TK2MSFTNGP09.phx.gbl,
> Ziek <Pete@start.net> posted their thoughts, then I offered mine
> > I have a client PC who is getting 5 different DNS server names
> > through our DHCP server.
> >
> > For some reason, this client seems to be using entry #4 in this list.
> > The way we assigned the DNS servers are like this:
> >
> > entry #1 = primary
> > entry #2 = seconday
> > entry #3 = tertiary
> > entry #4 = fail over DNS server (at our ISP) in case our in-house
> > boxes are down
> > entry #5= fail over #2 DSN server (at our ISP) in case in-house boxes
> > are down.
> >
> > We can't figure out why this client is using DNS entry #4, without
> > even attempting entry #1 !
> >
> > Are we confusing the PC by assigning that many dns entries?
>
>
> To add to Kevin's post and the reason behind it all....
>
> Tthe list doesn't get reset to go back and try the first one unless, the
> machine is restarted or the DNS client service is restarted, or fudging a
> registry entry on all the machines (not practical if you ask me). It also
> depends on what is being queried for it to drop down to DNS entry #4. If
> it's an outside resource and the Root zone exists on the internal DNS,
then
> I can see why it's happening or just as you said Kevin, the machine is not
> answering quick enough during a recursion.
>
> To also add, using multiple DNS entries is a fail over solution providing
> FAULT TOLERANCE and it's NOT load balancing solution, apparently why you
may
> have chosen to have mutliple entries. So this means that ALL DNS servers
> MUST have the same exact zone information in them. If you have AD, then no
> way will the ISP have your internal AD information, so therefore it is not
a
> fault tolerant solution to have your ISP's set.
>
> Use of a forwarder is the answer for Internet resolution. To configure
> forwarding (in case you're not sure how to - and be sure to delete the
Root
> zone, or the option is grayed out, which this also shows how-to):
> http://support.microsoft.com/?id=300202
>
> Here's a couple links on the way the DNS resolver service works. Keep in
> mind:
>
> 261968 - Explanation of the Server List Management Feature in the Domain
> Name Resolver Client:
> http://support.microsoft.com/?id=261968
>
> 286834 - The DNS Client Service Does Not Revert to Using the First Server
in
> the List:
> http://support.microsoft.com/?id=286834
>
> --
> Regards,
> Ace
>
> Please direct all replies to the newsgroup so all can benefit.
> This posting is provided "AS-IS" with no warranties and confers no
> rights.
>
> Ace Fekay, MCSE 2000, MCSE+I, MCSA, MCT, MVP
> Microsoft Windows MVP - Active Directory
> --
> =================================
>
>

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