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If you assign /16 to any site..all machines IP address comes under this /16 (10.80.0.1 to 10.80.255.254) &nbsp;will authenticate with DC's available in site which you have mentioned in AD sites &amp;&nbsp;services.
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If you assign /16 to any site..all machines IP address comes under this /16 (10.80.0.1 to 10.80.255.254)  will authenticate with DC's available in site which you have mentioned in AD sites & services.

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Thanks for the excellent info - backed up by a TechNet article. &nbsp;Perfect!
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Thanks for the excellent info - backed up by a TechNet article.  Perfect!

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AD 2003 environment, with AD Sites &amp;&nbsp;Services set up fairly well.<br />
<br />
We have hundreds of retail sites that use /27 subnets - all the way from 10.80.0.1 to 10.80.34.254. &nbsp;They are now visible to my DCs because we switched to MPLS, and I'm getting bombarded by this message:<br />
<br />
Event ID 5807 - Connections from client machines who don't map to any of the existing sites in the enterprise.<br />
<br />
My question is this: &nbsp;Do I need to list every subnet in S&amp;S to fix this, or could I simply point the /16 subnet 10.80.0.0 to the home site?<br />
<br />
Thanks for your help!
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AD 2003 environment, with AD Sites & Services set up fairly well.

We have hundreds of retail sites that use /27 subnets - all the way from 10.80.0.1 to 10.80.34.254.  They are now visible to my DCs because we switched to MPLS, and I'm getting bombarded by this message:

Event ID 5807 - Connections from client machines who don't map to any of the existing sites in the enterprise.

My question is this:  Do I need to list every subnet in S&S to fix this, or could I simply point the /16 subnet 10.80.0.0 to the home site?

Thanks for your help!

AD Sites &amp; Svcs and Micro Subnets

Active Directory (AD) is a Microsoft brand for identity-related capabilities. In the on-premises world, Windows Server AD provides a set of identity capabilities and services, and is hugely popular (88% of Fortune 1000 and 95% of enterprises use AD). This topic includes all things Active Directory including DNS, Group Policy, DFS, troubleshooting, ADFS, and all other topics under the Microsoft AD and identity umbrella.

Active Directory

Windows Server 2003 was based on Windows XP and was released in four editions: Web, Standard, Enterprise and Datacenter. It also had derivative versions for clusters, storage and Microsoft’s Small Business Server. Important upgrades included integrating Internet Information Services (IIS), improvements to Active Directory (AD) and Group Policy (GP), and the migration to Automated System Recovery (ASR).

AD Sites &amp; Svcs and Micro Subnets

AD Sites & Svcs and Micro Subnets