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Redundant DNS for Clients PCs RRS feed

  • Question

  • Hi,

    I have single AD domain and forest.  I have 2 Sites A & B. (Integrated DNS)

    Site A has DC1 & DC2

    Site B has DC3 & DC4

    Clients in Site A , Primary DNS Should be DC1 and DC3 ?  so if both DCs will down in Site A , User will use Site B DNS Server ?

    Is it Ok ? or there is much better option.

    Regards

    Usman Ghani


    Usman Ghani - MCITP Exchange 2010

    Thursday, January 18, 2018 9:19 AM

All replies

  • Hi,

    It's ok. All DCs have entire dns record due to multi-master replication.

    Or you could configure as below

    DC1   preferred dns  : DC2   alternate dns :127.0.0.1     

    DC2   preferred dns  : DC3   alternate dns :127.0.0.1    

    DC3   preferred dns  : DC4   alternate dns :127.0.0.1    

    DC4   preferred dns  : DC1   alternate dns :127.0.0.1    

    Clients in Site A   preferred dns  : DC1     alternate dns :DC2 ,DC3,DC4

    Clients in Site B   preferred dns  : DC3     alternate dns :DC4 ,DC1,DC2

    Advanced TCP/IP Settings  :DNS list


     More information about Active Directory-Integrated DNS ,please refer to it.

    https://technet.microsoft.com/en-us/library/cc978010.aspx?f=255&MSPPError=-2147217396


    Best Regards,

    Frank



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    Friday, January 19, 2018 7:38 AM
  • Hi,
    Just checking in to see if the information provided was helpful. Please let us know if you would like further assistance.

    Best Regards,

    Frank

    Please remember to mark the replies as an answers if they help.
    If you have feedback for TechNet Subscriber Support, contact tnmff@microsoft.com

    Monday, January 22, 2018 9:05 AM
  • Hi,

    Was your issue resolved? 

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    Best Regards,
    Frank

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    Tuesday, January 23, 2018 9:39 AM
  • Hi,

    Thank you for <g class="gr_ gr_233 gr-alert gr_gramm gr_inline_cards gr_run_anim Grammar only-ins doubleReplace replaceWithoutSep" data-gr-id="233" id="233">reply</g>, I just want to check <g class="gr_ gr_68 gr-alert gr_spell gr_inline_cards gr_run_anim ContextualSpelling ins-del" data-gr-id="68" id="68">whats</g> the logic to set <g class="gr_ gr_115 gr-alert gr_spell gr_inline_cards gr_run_anim ContextualSpelling multiReplace" data-gr-id="115" id="115">prefered</g> DNS of another DNS Server while <g class="gr_ gr_159 gr-alert gr_tiny gr_spell gr_inline_cards gr_run_anim ContextualSpelling multiReplace" data-gr-id="159" id="159">i</g> think DNS server itself should have <g class="gr_ gr_213 gr-alert gr_spell gr_inline_cards gr_run_anim ContextualSpelling multiReplace" data-gr-id="213" id="213">prefered</g> DNS its own IP. 

    Would you please explain below.

    DC1   preferred <g class="gr_ gr_346 gr-alert gr_spell gr_inline_cards gr_run_anim ContextualSpelling ins-del multiReplace" data-gr-id="346" id="346">dns</g>  : DC2   alternate <g class="gr_ gr_347 gr-alert gr_spell gr_inline_cards gr_run_anim ContextualSpelling ins-del multiReplace" data-gr-id="347" id="347">dns</g> :127.0.0.1

    While <g class="gr_ gr_354 gr-alert gr_tiny gr_spell gr_inline_cards gr_run_anim ContextualSpelling multiReplace" data-gr-id="354" id="354">i</g> think it should be

    DC1   preferred <g class="gr_ gr_374 gr-alert gr_spell gr_inline_cards gr_run_anim ContextualSpelling ins-del multiReplace" data-gr-id="374" id="374">dns</g>  : DC1   alternate <g class="gr_ gr_375 gr-alert gr_spell gr_inline_cards gr_run_anim ContextualSpelling ins-del multiReplace" data-gr-id="375" id="375">dns</g> :DC2

    I am talking about DNS Servers not DNS Settings on <g class="gr_ gr_448 gr-alert gr_gramm gr_inline_cards gr_run_anim Grammar only-ins replaceWithoutSep" data-gr-id="448" id="448">Client</g> side.

    <g class="gr_ gr_456 gr-alert gr_spell gr_inline_cards gr_run_anim ContextualSpelling ins-del multiReplace" data-gr-id="456" id="456">Reagrds</g>

    Usman Ghani


    Usman Ghani - MCITP Exchange 2010

    Tuesday, January 23, 2018 4:12 PM
  • Hi,

    You have a garbled reply.

    DNS point to its own IP is to avoid DNS island issue.

    Island DNS
    AD-integrated zones and a split-brain DNS design can create a conflict known as island DNS. In an island DNS situation, two or more DCs act as DNS servers for a domain, hosting an AD-integrated zone as usual. However, each DC is aware only of itself. Each DC registers its DC-identification information in its copy of the DNS zone but never replicates that information to the other DC/DNS servers (i.e., servers that do double duty as DCs and DNS servers). Therefore, each DC/DNS server thinks that it's the only one on the planet.

    If you means the primary zone,secondary zone.  AD-Integrated DNS is unchecked when you choose secondary zone.


    Best Regards,
    Frank


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    Wednesday, January 24, 2018 5:39 AM
  • Hi,
    Just checking in to see if the information provided was helpful. Please let us know if you would like further assistance.

    Best Regards,

    Frank

    Please remember to mark the replies as an answers if they help.
    If you have feedback for TechNet Subscriber Support, contact tnmff@microsoft.com

    Thursday, January 25, 2018 10:23 AM