Users Guide

● If DHCP is enabled on CMC and you want to use the DNS address obtained automatically by the DHCP server, type the
following command:
racadm config -g cfgLanNetworking -o
cfgDNSServersFromDHCP 1
● If DHCP is disabled on CMC or you want manually to input your DNS IP address, type the following commands:
racadm config -g cfgLanNetworking -o
cfgDNSServersFromDHCP 0
racadm config -g cfgLanNetworking -o
cfgDNSServer1 <primary DNS IP address>
racadm config -g cfgLanNetworking -o
cfgDNSServer2 <secondary DNS IP address>
Extended Schema Active Directory Overview
Using the extended schema solution requires the Active Directory schema extension.
Active Directory Schema Extensions
The Active Directory data is a distributed database of attributes and classes. The Active Directory schema includes the rules
that determine the type of data that can be added or included in the database. One example of a class that is stored in the
database is the user class. Some example user class attributes can include the user’s first name, last name, phone number, and
so on.
You can extend the Active Directory database by adding your own unique attributes and classes for specific requirements. Dell
has extended the schema to include the necessary changes to support remote management authentication and authorization
using Active Directory.
Each attribute or class that is added to an existing Active Directory Schema must be defined with a unique ID. To maintain
unique IDs across the industry, Microsoft maintains a database of Active Directory Object Identifiers (OIDs) so that when
companies add extensions to the schema, they can be guaranteed to be unique and not to conflict with each other. To extend
the schema in Microsoft's Active Directory, Dell received unique OIDs, unique name extensions, and uniquely linked attribute IDs
for the attributes and classes that are added into the directory service.
● Dell extension: dell
● Dell base OID: 1.2.840.113556.1.8000.1280
● RAC LinkID range: 12070 to 12079
Overview of Schema Extensions
Dell has extended the schema to include an Association, Device, and Privilege property. The Association property is used to link
together the users or groups with a specific set of privileges to one or more RAC devices. This model provides an administrator
maximum flexibility over the different combinations of users, RAC privileges, and RAC devices on the network without much
complexity.
When there are two CMCs on the network that you want to integrate with Active Directory for authentication and
authorization, create at least one association object and one RAC device object for each CMC. You can create multiple
association objects, and each association object can be linked to as many users, groups of users, or RAC device objects as
required. The users and RAC device objects can be members of any domain in the enterprise.
However, each association object can be linked (or, may link users, groups of users, or RAC device objects) to only one privilege
object. This example allows an administrator to control each user’s privileges on specific CMCs.
The RAC device object is the link to RAC firmware for querying Active Directory for authentication and authorization. When a
RAC is added to the network, the administrator must configure the RAC and its device object with its Active Directory name so
that users can perform authentication and authorization with Active Directory. Additionally, the administrator must add the RAC
to at least one association object for users to authenticate.
The following figure shows that the association object provides the connection that is needed for the authentication and
authorization.
NOTE: The RAC privilege object applies to DRAC 4, DRAC 5, and CMC.
Configuring User Accounts and Privileges 133