Backup DNS for SBS2011 - How does the client find where it is through DHCP

Hi All.

We had an issue with DNS on one of our clients SBS2011 server.

We solved the issue but as a precautionary measure we wanted to create a secondary DNS scope on a Server 2012R2 box that is available for use.

 We re-created the issue on our test SBS and 2012R2 server with a client PC attached.

We have successfully created the secondary DNS scope and it appears to replicate and work fine.

My question is as follows:
How do we get the Client PC, using DHCP, to see the second DNS in the event the SBS2011 DNS goes offline or stops working.

Thank you
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Lee W, MVPTechnology and Business Process AdvisorCommented:
Add the server to your list of DNS servers in the DHCP scope using the DHCP Administrative Tool.
AndyKeenAuthor Commented:
Hi Lee.

Thanks for the help.

Can you please explain where in DHCP I add the server and how.

Thank you
RantCanSr. Systems AdministratorCommented:
The new DNS should be added as a name server to your DHCP server for this to work properly.
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AndyKeenAuthor Commented:
In DHCP - Server options - 006 DNS Servers - I have specified the other DNS IP in here. Is this what you mean.
Lee W, MVPTechnology and Business Process AdvisorCommented:

then release and renew the address on the client or reboot.
AndyKeenAuthor Commented:
I had already added the second server in this way.
Although RANTCAN said I should add it as a name server in DHCP scope - should I ?

I have rebooted the PC in question but when I did an ipconfig /all it only shows me one DNS Server IP.
Lee W, MVPTechnology and Business Process AdvisorCommented:
Scope options override server options - do you have the DNS server defined in multiple places?
AndyKeenAuthor Commented:
Sorry Lee - what do you mean - do I have the DNS server defined in multiple places - where else can I define it.
RantCanSr. Systems AdministratorCommented:
Here is the MSFT introduction to configuring DHCP settings. From here, you should select the topic "Integrating DHCP with DNS".
Lee W, MVPTechnology and Business Process AdvisorCommented:
Sorry - never saw your reply until this last one - see the image.
DHCP Options
AndyKeenAuthor Commented:
RANTCAN - Thank you I will read that.

LEE - Thanks for the image. To confirm I already have the IP set in SERVER OPTIONS - 006 DNS SERVER - In here I now have two IP's - the main SBS and the secondary.

Am I right in thinking that I need the same in SCOPE OPTIONS - 006 DNS SERVER - just In a previous post above it was stated that I should put the IP of the secondary DNS server in the NAME SERVERS (005) - could you confirm please.

Thank you both for your help.
Lee W, MVPTechnology and Business Process AdvisorCommented:
You need to set one area and leave the other blank - so DNS options are specified in EITHER Server OR Scope, but not both.  If you have ONE in Server and the other in Scope, Scope overrides Server.  You can even override for the individual lease/reservation.

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