# Configure LDAP V1 security realms

The Lightweight Directory Access Protocol (LDAP) V1 security realm is an alternative to the File realm. It provides authentication through users and groups stored in an LDAP directory. This server allows you to manage all the users for your organization in one place: the LDAP directory. The LDAP V1 security realm supports Open LDAP, Netscape iPlanet, Microsoft Site Server, and Novell NDS LDAP servers.

To use the LDAP V1 security realm instead of the File realm:

1. If you have not already done so, in the Change Center of the Administration Console, click Lock & Edit (see Use the Change Center).
2. In the left pane, expand Compatibility Security > Realms and click New.

   The Create a New Basic Realm page appears.

3. In the Name field, enter a name for the LDAP V1 security realm.
4. In the Type drop-down list, select `LDAP Realm V1`.
5. Click OK.
6. Define attributes for the LDAP directory server and specify how users and groups are located in the LDAP V1 security realm.

   For more information:

   - Enable communication between the LDAP Server and WebLogic Server
   - Define how to store users in LDAP V1 security realms
   - Define how to store groups in LDAP V1 security realms
7. When you have finished defining all the attributes, reboot WebLogic Server.
8. Configure the Caching realm. For more information, see Configure Caching realms .

   When configuring the Caching realm, select the LDAP Realm V1 option from the pull-down menu for the Basic Realm attribute on the Caching Realms: Configuration: General page. The Basic Realm attribute defines the association between the Caching realm and the alternate security realm (in this case, the LDAP V1 security realm).

9. In the left pane, select your domain (for example, mydomain).
10. Open the Compatibility Security: File Realm page.
11. In the Caching Realm field, choose the name of the Caching realm to be used with the LDAP V1 security realm. A list of configured Caching realms appears on the drop-down menu.
12. Reboot WebLogic Server.