Create and Assign Subnets to Each Site in Active Directory Sites and Services

Adding subnets to a site helps Active Directory know where a computer or domain joined device lives within your Active Directory infrastructure.  By adding the appropriate subnets for each site to Active Directory Sites and Services you are telling Active Directory that traffic for COMPUTER1 is coming from IP 10.100.x.x and that IP is in site FloridaSite so COMPUTER1 is in FloridaSite.  This will help the computer know which Domain Controller to try to authenticate with first and will help AD integrated services know where the closest Global Catalog server is in the domain.

• We will continue from where we left off and begin in the Active Directory Sites and Services MMC.

• Expand the Sites folder and right-click Subnets then click New subnet

• New Object – Subnet: Type in the network in CIDR format inf the Prefix text box then select the site that has this subnet.  Click OK

• You will now see the new subnet in the Active Directory Sites and Services MMC under the Subnets folder.

• To edit the existing subnet simply double-click the object and change any parameters you need to

• I have created the remaining subnets needed for my test lab and am now ready to create Inter-Site transports for replication traffic.

    This concludes how to Create and Assign Subnets to Each Site in Active Directory Sites and Services.

    I hope this was helpful and informative to you and I would appreciate any feedback you may have.