Recipe 11.4 Creating a Subnet

11.4.1 Problem

You want to create a subnet.

11.4.2 Solution

11.4.2.1 Using a graphical user interface

1. Open the Active Directory Sites and Services snap-in.

2. Right-click on the Subnets container and select New Subnet.

3. Enter the Address and Mask and then select which site the subnet is part of.

4. Click OK.

11.4.2.2 Using a command-line interface

Create an LDIF file called create_subnet.ldf with the following contents:

dn: cn=<Subnet>,cn=subnets,cn=sites,cn=configuration,<ForestRootDN> changetype: add objectclass: subnet siteObject: cn=<SiteName>,cn=sites,cn=configuration,<ForestRootDN>

then run the following command:

> ldifde -v -i -f create_subnet.ldf

11.4.2.3 Using VBScript

' This code creates a subnet object and associates it with a site. ' ------ SCRIPT CONFIGURATION ------ strSubnet = "<Subnet>"     ' e.g. 10.5.3.0/24 strSite   = "<SiteName>"   ' e.g. Dallas ' ------ END CONFIGURATION --------- set objRootDSE = GetObject("LDAP://RootDSE") set objSubnetsCont = GetObject("LDAP://cn=subnets,cn=sites," & _                                objRootDSE.Get("configurationNamingContext") ) set objSubnet = objSubnetsCont.Create("subnet", "cn=" & strSubnet) objSubnet.Put "siteObject", "cn=" & strSite & ",cn=sites," & _                             objRootDSE.Get("configurationNamingContext")  objSubnet.SetInfo WScript.Echo "Successfully created subnet " & strSubnet

11.4.3 Discussion

Subnet objects reside in the Subnets container (e.g., cn=subnets,cn=sites,cn=configuration,dc=rallencorp,dc=com) in the CNC. The relative distinguished name (RDN) of the subnet should be the subnet address and bit-mask combination (e.g., 10.5.3.0/24). The other important attribute to set is siteObject, which should contain the DN of the site that the subnet is associated with.

11.4.4 See Also

MS KB 323349 (HOW TO: Configure Subnets in Windows Server 2003 Active Directory)