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With the Likewise UID-GID Management Module, you can enhance the functionality of Likewise Open. Specifically you can:

• Authenticate users and groups with Likewise Open by using UID-GID information from Active Directory.
  
• Centralise and simplify UID-GID management by using Active Directory Users and Computers (ADUC) to manage your Linux, Unix, and Mac OS X users.
  
• Control access to Linux, Unix, and Mac computers based on the UID-GID values that you set.
  
• Set home directories and login shells in ADUC.
  
• Mirror your organisational units with Likewise cells and map Active Directory users and groups to UIDs and GIDs.
  
• Administer organisational units for Linux and Unix with Cell Manager, a Likewise MMC snap-in for managing Likewise cells.

What is the Likewise UID-GID Module doing?

In Likewise Open, a UID and GID are generated by hashing the user or group's security identifier, or SID, from Active Directory. You do not need to make any changes to Active Directory. Although a UID and GID stays the same across host machines, you cannot set UIDs and GIDs for Linux and Unix in Active Directory.

Using AD to set and manage UIDs and GIDs is a feature of the Likewise UID-GID management tool. If you have UIDs and GIDs defined in Active Directory, Likewise Open will not use those UIDs and GIDs unless you have installed the Likewise UID-GID management tool.

Moreover, if your Active Directory relative identifiers, or RIDs, are a number greater than 524,287, the Likewise Open algorithm that generates UIDs and GIDs can result in UID-GID collisions among users and groups. In such cases, it is recommended that you use the Likewise UID-GID management tool.

Comparing Likewise Open and Enterprise

What’s the difference?
Likewise Open is freely downloadable open source software for authenticating Linux, Unix, and Mac computers with Microsoft Active Directory.

Likewise Enterprise is a commercially licensed, fully supported product that provides advanced Active Directory authentication, authorization, management, and reporting capabilities for Linux, Unix, and Mac OS X computers. Likewise Enterprise includes a management console, MMC snap-ins, and hundreds of group policies that empower you to manage Linux and Unix computers within Active Directory.

Who should choose Likewise
If you meet any of the following business requirements, Likewise Enterprise is the solution for you:

Feature	Business Requirement
MMC snap-ins for Active Directory Users and Computers	To seamlessly integrate Linux, Unix, and Mac users and computers into Microsoft Active Directory and manage their settings from a central location
Migration	To migrate user information from insecure NIS or /etc/passwd files into Active Directory
Granular Access Control	To customise the mapping of an Active Directory user to a set of Unix attributes so you can provide users with different primary and secondary group memberships on different machines
Group Policy	To simplify the management of your network with group policies and apply granular levels of access and privilege to different non-Windows users
Compliance and Security Reporting	To demonstrate compliance with regulatory and security requirements
Technical Support	To obtain enterprise-level, 24x7 technical support

Feature Comparison

Feature	Likewise Open License	Likewise Enterprise Commercial License
Tools Included	Agents for Linux, Unix, Mac	Agents for Linux, Unix, Mac MMC snap-ins for Active Directory Users and Computers to centrally manage Linux, Unix, and Mac computers and users Windows-side reporting console Domain configuration wizard Integrated migration tool Orphaned objects tool
Authentication Features	Join Linux computers to Active Directory and apply Domain Controller policies No schema changes Single sign-on for SSH and Putty Single UID automatically assigned	Join, authenticate, authorize, and manage non-Windows computers in Active Directory Choice of schema or non-schema mode Single sign-on for enterprise applications that support Kerberos and LDAP, including Web applications, databases, ERP and storage, etc. Complex UID scenarios supported, including manual UID assignments and many-to-one mapping with cell technology
Group Policies for Linux, Unix, and Mac	Apply a few policies to all Linux systems together: Logon using Kerberos authentication, and allow cached logon credentials Increase user-level security by requiring complex passwords that must be changed at a set interval	Apply hundreds of group policies to non-Windows systems selectively: Do more during logon: Create a home directory, copy template files, set permissions, run scripts, deliver messages, and more Do more to increase security: Refresh Kerberos tickets, lock down desktops, define sudo policies, rotate logs, secure Mac system preferences Automate custom processes using Cron policies and powerful scripting capabilities

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