Chapter 6. Domain Membership
Study Lesson 1: Active Directory Domain Services flashcards from Andrew R's class To create a trust relationship with an NT4 domain, you will configure a(n) . Hi all, I have configured Samba 3 as a PDC for domain "LINDOMAIN", configured a trust relation ship between the samba server and a. Configure security settings in the Windows Server R2 domain as to establish an outbound trust relationship with the NT domain.
This relationship is referred to as a trust. In a Windows NT environment, a trust relationship defines a formal and secure way for DCs from different Windows NT domains to communicate with each other for the purpose of authenticating accounts.
As in human relationships, a trust requires the consent of two parties, the trusted party the one that desires access to some resource and the trusting party the one with resources to share.
In a trust relationship, the trusting party is said to "trust" the trusted party. Trust provides for three important features in a multidomain environment. First, it ensures that a single logon account can be used, regardless of where, across the domains, a user is logging on.
This is important because it means that users do not need one account in one domain and another is another. Second, it provides users with universal resource access. This concept means that a user from one domain can access resources from another by providing the credentials established from her home domain.
Establishing a trust between AD and NT4 domain - Ars Technica OpenForum
Third, trusts provide for centralized administration of account information by ensuring that all authentication is kept in a central place and not spread out over multiple SAM databases. Before showing the mechanics of creating a trust, note two important points.
First, trust relationships between Windows NT servers are all one-way. That is, just because one domain trusts another does not necessarily mean that it also is trusted by the other. To establish reciprocal trusts, two one-way trusts must be established. Second, trust relationships between Windows NT servers are nontransitive. These notes are important, not only for their own sake and that of the exam but because they are in marked contrast from the way that trusts work in a Windows forest, which are marked by two-way transitive trusts.
It is also important because trusts can be established between a Windows NT domain and a Windows domain; however, the interaction between these follows the trust rules pertaining to pure Windows NT domains and not to Windows domains.
Understand Trust Terminology It is very important that you understand the terminology of trusts for the exam. You may be asked to establish trusts between two domains with only the information about Trusted and Trusting to guide you. Finally, you might be given diagrams where all you have is an arrow to show the trust relationships. If that is the case, the arrow head will always point to the trusted account domain and away from the trusting resource domain see Figure 4.
- Establishing a trust between AD and NT4 domain
- Creating Trusts between UCS Samba/AD and Native Microsoft Active Directory Domains
Understanding the terminology in this diagram is essential. The Domain Models Although this is not a book or an exam that deals in depth with enterprise computing and multidomain models, you are expected to know a little of the theory behind multiple domain environments in which trust relationships are built because this exam is a hybrid between the old Windows NT Server and NT Enterprise exams.
Microsoft identifies four different domain models. These models are not all equal in their value or desirability, but they all may be found in one form or another in enterprise environments. The models are as follows: In terms of desirability and simplicity, the order that they are listed is the order of desirability and simplicity.
All domain environments should strive to be single domain. If that is not possible, the next best scenario is the single master, and so on. The Single Domain Model This model is characterized by a single domain and a lack of requirement for trust relationships. All resources are in the same domain, as are all the user, group, and computer accounts. The Single Master Domain Model This model is characterized by a single account domain and one or more resource domains see Figure 4.
The single master domain model. In this model, all the user and group accounts are held in a single master domain. On the other hand, all the resources printers, folders, and so forth are in resource domains. Because the resource domains do not have user accounts, there is a need for only one-way trusts, from the resource domains to the master domain.
There are no trust relationships between the resource domains because there are no user accounts in them to be trusted.Configuring One Way Forest Trust with Selective Authentication
In such a model, it is possible to have the computer accounts technically a resource be held in one or more of the resource domains. If this is done, it will reduce the size of the SAM in the master domain by one account per computer. Doing this might make it practical to have only one master domain even in a large enterprise.
The Multiple Master Domain Model This model is characterized by two or more account domains and one or more resource domains see Figure 4. The multiple master domain model. This model is created when the number of user and group accounts is too large to be practically held in a single master domain.
Note that this model adds an extra level of complexity because many more trusts are required in this model than in the single master domain model.
In this model, trust relationships must be established between the resource domains and each of the account domains. In addition, one-way trusts must be established between the master domains. Because the resource domains do not have user or group accounts, there is no reason that any domain should trust them. As you can see, as the number of domains increases, the number of trusts required increases exponentially. It is a general rule of thumb that the model with the fewest trusts is the best both for network communication and maintainability.
The Complete Trust Model This model is characterized by multiple domains, each with both resources as well as user and group accounts see Figure 4. The complete trust model. In this model, each domain must trust every other domain. These domains arise from grassroots implementations of Windows NT domains without a unifying architecture to guide them.
As a result, they are haphazard and complicated to maintain. Creating Trust Relationships To create a trust relationship between two domains, you must first decide which domain is the trusted domain contains users and which is the trusting domain contains resources.
Then you configure the appropriate settings on a domain controller for each of the domains. Once both are configured, the trust is established. Step by Step 4.
From the Policies menu, choose Trust Relationships see Figure 4. Choose Trust Relationships from the Policies menu. In the Add Trusting Domain dialog box, type the name of the domain that trusts this domain and, if desired, configure a password to ensure that the trust is not completed by an unauthorized person; the password will have to be entered again when the other side of the trust is complete see Figure 4.
Click OK when this is complete. Add a trusting domain.
In the Trust Relationships dialog box, click the Close button. From the Policies menu, choose Trust Relationships. In the Add Trusted Domain dialog box, type the name of the domain that this domain trusts and, if required, enter the password to complete the trust see Figure 4. Add a trusted Domain.
Lesson 1: Active Directory Domain Services Flashcards by Andrew R | Brainscape
In Step by Step 4. You do not have to set up the trust up in this order. If you do not, however, you will not get confirmation of the trust being established. Instead, when you configure the entry for the trusted domain in the trusting domain, you will receive a message indicating that the trust could not be verified.
Maintaining Trust Relationships Trust relationships must be maintained to continue to function.
trust relationship with NT domain
Fortunately, this maintenance is done automatically by the DCs in the respective domains. If a trust is broken, however, it will need to be reestablished to continue functioning.
To be maintained, the DCs from each domain need to be able to talk to each other.
Should this not be the case, the trust will be placed on hold until communication is reestablished. In two cases, however, trusts must be removed and reestablished: If the name of either domain in the trust relationship is changed If the trust is manually removed from either or both domains If a trust relationship is broken because of either of these reasons, the trust must be removed from both sides and reestablished.
To do this, just open User Manager for Domains, select the entry you want to remove, and click the Remove button. You will be warned that the trust is being removed. Please refer to Winbind: The advantage to Domain-level security is that the authentication in Domain-level security is passed down the authenticated RPC channel in exactly the same way that an NT server would do it.
This means Samba servers now participate in domain trust relationships in exactly the same way NT servers do i. This can drain the connection resources on a Microsoft NT server and cause it to run out of available connections. And finally, acting in the same manner as an NT server authenticating to a PDC means that as part of the authentication reply, the Samba server gets the user identification information such as the user SID, the list of NT groups the user belongs to, and so on.
Note Much of the text of this document was first published in the Web magazine LinuxWorld as the article http: A familiarity with Kerberos is assumed.
Lesson 1: Active Directory Domain Services Flashcards Preview
The default setting is not present is Yes. This is part of the installation and configuration process used to create an Active Directory Domain. When manually configuring krb5. With Heimdal versions earlier than 0. Unfortunately this whole area is still in a state of flux. Note Time between the two servers must be synchronized. Clock skew limits are configurable in the Kerberos protocols.
The default setting is five minutes. If you do not get this correct then you will get a local error when you try to join the realm. If all you want is Kerberos support in smbclient then you can skip directly to Testing with smbclient now. Create the Computer Account and Testing Server Setup are needed only if you want Kerberos support for smbd and winbindd. Create the Computer Account As a user who has write permission on the Samba private directory usually rootrun: Samba-3 permits this to be done using the following syntax: You should be logged in with Kerberos without needing to know a password.
If this fails then run klist tickets.
Did you get a ticket for the server? Testing with smbclient On your Samba server try to login to a Win server or your Samba server using smbclient and Kerberos.
Use smbclient as usual, but specify the -k option to choose Kerberos authentication. Notes You must change administrator password at least once after DC install, to create the right encryption types. Perhaps this will be fixed later in service packs. These mappings are done by the idmap subsystem of Samba.
To use the LDAP ldap idmap suffix, set: Do not forget to specify also the ldap admin dn and to make certain to set the LDAP administrative password into the secrets. In truth, it is seldom necessary to reinstall because of this type of problem.
The real solution is often quite simple and with an understanding of how MS Windows networking functions, it is easy to overcome. The original domain machine account was deleted and added immediately. The workstation will not join the domain if I use the same machine name.