Active Directory Cookbook

11.4. Creating a Subnet

Problem

You want to create a subnet.

Solution

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.

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

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

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 ...