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Group:  English: Windows Server » microsoft.public.windows.server.dns
Thread: DNS Resolution - Stub or Delegation

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DNS Resolution - Stub or Delegation
Tony Dawson <noone[ at ]nowhere.org> 4/19/2007 4:02:48 PM
My bosses have asked me to take a look at getting name resolution
working between the domains in our enterprise. The domains are in
separate locations with VPN's between each location which allow DNS
queries across them. Each domain is completely unaware of the other
domains in DNS.

The structure is :-
example.com DNS servers are two W2K3 DC's and two W2K DC's.
subdom1.example.com DNS Server are four W2K DC's.
subdom2.example.com DNS Servers are two W2K3 DC's.

othdom.exampletwo.com DNS servers are two W2K3 DC's and two W2K DC's.

What would be the best practice way of doing this ?. I have looked at
Conditional Forwarders, Stub zones and Delegation. I have figured that
Conditional Forwarders are not appropriate but am unsure of which would
be best out of Stub or Delegation.

Any help appreciated

Thanks
Tony Dawson
Re: DNS Resolution - Stub or Delegation
"Herb Martin" <news[ at ]learnquick.com> 4/19/2007 7:22:53 PM

You can only use Delegation DOWN to a child domain.

Stubs work both down and "across" to unrelated or sister DNS zones.

"Tony Dawson" <noone[ at ]nowhere.org> wrote in message
news:462792A8.1010403[ at ]nowhere.org...
[Quoted Text]
> My bosses have asked me to take a look at getting name resolution working
> between the domains in our enterprise. The domains are in separate
> locations with VPN's between each location which allow DNS queries across
> them. Each domain is completely unaware of the other domains in DNS.
>
> The structure is :-
> example.com DNS servers are two W2K3 DC's and two W2K DC's.
> subdom1.example.com DNS Server are four W2K DC's.
> subdom2.example.com DNS Servers are two W2K3 DC's.
>
> othdom.exampletwo.com DNS servers are two W2K3 DC's and two W2K DC's.
>
> What would be the best practice way of doing this ?. I have looked at
> Conditional Forwarders, Stub zones and Delegation. I have figured that
> Conditional Forwarders are not appropriate

Why?

> but am unsure of which would be best out of Stub or Delegation.

In most cases these are all roughly equivalent -- the differences are very
subtle and only matter in certainl large networks usually. Even using
entire Secondaries on the "other DNS" servers are usually fine in reasonable
size domains -- and the only real choice besides Delegation for Child zones
when using Win2000.

Secondaries -- always work, even in Win2000 for non-child zones but MAY
require copying a lot of records which will never be needed.
Stubs -- like secondaries but do NOT copy all of the records; mostly this
is useful for large zones/domains
Conditional forwarding -- directs to specific servers for resolving other
zones
Similar to Stubs BUT allows *YOU*, the admin, to pick which DNS
servers are most efficient to use, rather than stubs which keep the
DNS server being used up to date automatically but do NOT allow
you to pick for efficiency

Also, if you are in a single forest and have ALL Win2003 DNS-DCs then
you can use:

Forest-wide Replication scope for AD Integrated DNS

This is my favorite for most forests.


--
Herb Martin, MCSE, MVP
http://www.LearnQuick.Com
(phone on web site)


Re: DNS Resolution - Stub or Delegation
Tony Dawson <noone[ at ]nowhere.org> 4/19/2007 8:13:58 PM
Herb Martin wrote:
[Quoted Text]
> You can only use Delegation DOWN to a child domain.
>
> Stubs work both down and "across" to unrelated or sister DNS zones.
>
> "Tony Dawson" <noone[ at ]nowhere.org> wrote in message
> news:462792A8.1010403[ at ]nowhere.org...
>> My bosses have asked me to take a look at getting name resolution working
>> between the domains in our enterprise. The domains are in separate
>> locations with VPN's between each location which allow DNS queries across
>> them. Each domain is completely unaware of the other domains in DNS.
>>
>> The structure is :-
>> example.com DNS servers are two W2K3 DC's and two W2K DC's.
>> subdom1.example.com DNS Server are four W2K DC's.
>> subdom2.example.com DNS Servers are two W2K3 DC's.
>>
>> othdom.exampletwo.com DNS servers are two W2K3 DC's and two W2K DC's.
>>
>> What would be the best practice way of doing this ?. I have looked at
>> Conditional Forwarders, Stub zones and Delegation. I have figured that
>> Conditional Forwarders are not appropriate
>
> Why?
>
>> but am unsure of which would be best out of Stub or Delegation.
>
> In most cases these are all roughly equivalent -- the differences are very
> subtle and only matter in certainl large networks usually. Even using
> entire Secondaries on the "other DNS" servers are usually fine in reasonable
> size domains -- and the only real choice besides Delegation for Child zones
> when using Win2000.
>
> Secondaries -- always work, even in Win2000 for non-child zones but MAY
> require copying a lot of records which will never be needed.
> Stubs -- like secondaries but do NOT copy all of the records; mostly this
> is useful for large zones/domains
> Conditional forwarding -- directs to specific servers for resolving other
> zones
> Similar to Stubs BUT allows *YOU*, the admin, to pick which DNS
> servers are most efficient to use, rather than stubs which keep the
> DNS server being used up to date automatically but do NOT allow
> you to pick for efficiency
>
> Also, if you are in a single forest and have ALL Win2003 DNS-DCs then
> you can use:
>
> Forest-wide Replication scope for AD Integrated DNS
>
> This is my favorite for most forests.
>
>
Thanks for the response. Very helpful. The reason that I did not
consider Conditional Forwarding appropriate was that I received an error
when I tried adding a forwarder for subdomn.example.com to the
example.com Windows 2003 dns servers. The error was "The server
forwarders cannot be updated. A zone configuration problem occurred". I
am guessing that it is because the example.com domain has a mix of
Windows 2000 and Windows 2003 DNS servers (we are running in Windows
2000 native mode). I suspected that there should be no Windows 2000 DNS
servers in the example.com domain for conditional forwarding to work and
enable the subdomains to be resolved.
Re: DNS Resolution - Stub or Delegation
"Herb Martin" <news[ at ]learnquick.com> 4/19/2007 8:36:33 PM

"Tony Dawson" <noone[ at ]nowhere.org> wrote in message
news:ukmpM9rgHHA.4952[ at ]TK2MSFTNGP02.phx.gbl...
[Quoted Text]
> Herb Martin wrote:
>> You can only use Delegation DOWN to a child domain.
>>
>> Stubs work both down and "across" to unrelated or sister DNS zones.
>>
>> "Tony Dawson" <noone[ at ]nowhere.org> wrote in message
>> news:462792A8.1010403[ at ]nowhere.org...
>>> My bosses have asked me to take a look at getting name resolution
>>> working between the domains in our enterprise. The domains are in
>>> separate locations with VPN's between each location which allow DNS
>>> queries across them. Each domain is completely unaware of the other
>>> domains in DNS.
>>>
>>> The structure is :-
>>> example.com DNS servers are two W2K3 DC's and two W2K DC's.
>>> subdom1.example.com DNS Server are four W2K DC's.
>>> subdom2.example.com DNS Servers are two W2K3 DC's.
>>>
>>> othdom.exampletwo.com DNS servers are two W2K3 DC's and two W2K DC's.
>>>
>>> What would be the best practice way of doing this ?. I have looked at
>>> Conditional Forwarders, Stub zones and Delegation. I have figured that
>>> Conditional Forwarders are not appropriate
>>
>> Why?
>>
>>> but am unsure of which would be best out of Stub or Delegation.
>>
>> In most cases these are all roughly equivalent -- the differences are
>> very
>> subtle and only matter in certainl large networks usually. Even using
>> entire Secondaries on the "other DNS" servers are usually fine in
>> reasonable
>> size domains -- and the only real choice besides Delegation for Child
>> zones
>> when using Win2000.
>>
>> Secondaries -- always work, even in Win2000 for non-child zones but MAY
>> require copying a lot of records which will never be needed.
>> Stubs -- like secondaries but do NOT copy all of the records; mostly this
>> is useful for large zones/domains
>> Conditional forwarding -- directs to specific servers for resolving other
>> zones
>> Similar to Stubs BUT allows *YOU*, the admin, to pick which DNS
>> servers are most efficient to use, rather than stubs which keep
>> the
>> DNS server being used up to date automatically but do NOT allow
>> you to pick for efficiency
>>
>> Also, if you are in a single forest and have ALL Win2003 DNS-DCs then
>> you can use:
>>
>> Forest-wide Replication scope for AD Integrated DNS
>>
>> This is my favorite for most forests.
>>
>>
> Thanks for the response. Very helpful. The reason that I did not consider
> Conditional Forwarding appropriate was that I received an error when I
> tried adding a forwarder for subdomn.example.com to the example.com
> Windows 2003 dns servers. The error was "The server forwarders cannot be
> updated. A zone configuration problem occurred". I am guessing that it is
> because the example.com domain has a mix of Windows 2000 and Windows 2003
> DNS servers

That sounds possible but conditional forwarding is NOT replicated so I
am not sure why that would be the case.

> (we are running in Windows 2000 native mode).

Mode is irrelevant -- that only affects DCs and added AD capabilities.

> I suspected that there should be no Windows 2000 DNS servers in the
> example.com domain for conditional forwarding to work and enable the
> subdomains to be resolved.

Conditional Forwarding is however a SERVER property; these are NOT
replicated as are AD Integrated ZONE properties.

You can't (fully) use the AD Integrated with "Forest Scope" as long as you
have
those DNS-DCs with Win2000. That feature was added with Win2003.

You cannot use Stubs ON the Win2000 Servers either -- but you can stub
FROM the Win2000 if you create the stub zone on a Win2003 DNS server.

The method that ALWAYS works (even for Win2000) is to just hold a
Secondary on the servers of Domain-A for Domain-Zone-B.

--
Herb Martin, MCSE, MVP
http://www.LearnQuick.Com
(phone on web site)


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