DNS Server Search List Behavior

  • Thread starter Thread starter John Collins
  • Start date Start date
J

John Collins

Can someone confirm or deny that the client will:

Use the first DNS server defined in the list until it becomes unavailable
then moves to the next one in the list?

It will continue to use this next server until it too becomes unavailable
then moves to the next one (or back to the first one if only two are
specified) in the list?

It continues in this way even if the previous server becomes available after
it moves to the next?

Regards,

John
 
In
John Collins said:
Can someone confirm or deny that the client will:

Use the first DNS server defined in the list until it becomes
unavailable then moves to the next one in the list?
Yes.


It will continue to use this next server until it too becomes
unavailable then moves to the next one (or back to the first one if
only two are specified) in the list?
Click to expand...

Yes, this is true too, but if TCP/IP is reset it will revert back. Although
IIRC, the system will reset the DNS server list itself after a period of
time. I believe there is a KB on this behavior, I guess I'm not using the
right search criteria, I can't seem to find it.
 
In
Kevin D. Goodknecht Sr. said:
Yes, this is true too, but if TCP/IP is reset it will revert back.
Although IIRC, the system will reset the DNS server list itself after
a period of time. I believe there is a KB on this behavior, I guess
I'm not using the right search criteria, I can't seem to find it.
Click to expand...

Here you go Kevin:

DNS Name Resolution Client Side Behavior: (Page down to Figure 6.7)
http://www.microsoft.com/resources/...00/server/reskit/en-us/cnet/cncf_imp_absq.asp

286834 - The DNS Client Service Does Not Revert to Using the First Server in
the List (see 245437 for reg entry to disable client caching to reset list):
http://support.microsoft.com/?id=286834

Querying DNS Servers - how the resolver service works:
http://www.microsoft.com/technet/tr...prodtechnol/winxppro/reskit/prjj_ipa_bsmz.asp

It's all explained in the DNS White paper (works for Win2000 and Win2003)
See page 38:
http://www.microsoft.com/windows2000/techinfo/howitworks/communications/nameadrmgmt/w2kdns.asp

--
Regards,
Ace

Please direct all replies ONLY to the Microsoft public newsgroups
so all can benefit.

This posting is provided "AS-IS" with no warranties or guarantees
and confers no rights.

Ace Fekay, MCSE 2003 & 2000, MCSA 2003 & 2000, MCSE+I, MCT, MVP
Microsoft Windows MVP - Windows Server - Directory Services
Infinite Diversities in Infinite Combinations.
=================================
 
Here you go Kevin:
Click to expand...
<snippage>

100% Correct Ace, and just to add my two cents, the query timeout can
be fine-tuned if needed by acting on a registry key as you can see here

http://www.microsoft.com/resources/...s/2000/server/reskit/en-us/regentry/96406.asp

(short URL http://tinyurl.com/6zkqd) and btw the entry documentation also
explains (were, more or less) how the resolution process is carried on by
the client

Regards

--

* ObiWan

Microsoft MVP: Windows Server - Networking
http://www.microsoft.com/communities/MVP/MVP.mspx
http://italy.mvps.org

DNS "fail-safe" for Windows clients.
http://www.ntcanuck.com

Newsgroups and forums
news://news.ntcanuck.com
http://forums.ntcanuck.com

408+ XP/2000 tweaks and tips
http://www.ntcanuck.com/tq/Tip_Quarry.htm
 
In
Ace Fekay said:
In Kevin D. Goodknecht Sr. [MVP] <[email protected]> stated, which I
then
commented on below:

Here you go Kevin:

DNS Name Resolution Client Side Behavior: (Page down to Figure 6.7)
http://www.microsoft.com/resources/...00/server/reskit/en-us/cnet/cncf_imp_absq.asp

286834 - The DNS Client Service Does Not Revert to Using the First
Server in
the List (see 245437 for reg entry to disable client caching to reset
list):
http://support.microsoft.com/?id=286834

Querying DNS Servers - how the resolver service works:
http://www.microsoft.com/technet/tr...prodtechnol/winxppro/reskit/prjj_ipa_bsmz.asp

It's all explained in the DNS White paper (works for Win2000 and
Win2003)
See page 38:
http://www.microsoft.com/windows2000/techinfo/howitworks/communications/nameadrmgmt/w2kdns.asp
Click to expand...

You see, I knew it existed. I guess it was one of the many very long days
I've had lately.
Thanks Ace.
 
In
Kevin D. Goodknecht Sr. said:
You see, I knew it existed. I guess it was one of the many very long
days I've had lately.
Thanks Ace.
Click to expand...

It's always a pleasure Kevin!

Ace
 
Folks,

Thank you very much. I've learned a thing or two...

Regards,

John


"Ace Fekay [MVP]"
 
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