Trust Relationships in .NET

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External trusts are familiar to any NT 4 administrators, as they were used between NT 4 and earlier domains An external trust is an intransitive trust as it is non-Kerberos in nature and is used to connect to NT 40 domains still in the environment
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A realm trust is used to connect an AD domain to a non-Windows Kerberos realm, such as a UNIX or MIT Kerberos Version 5 implementation Realm trusts are one-way or two-way trusts and can be transitive or intransitive
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11 DESIGNING AND INSTALLING ACTIVE DIRECTORY
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Figure 11-41 shows a summary of all the various trusts you may use You manage all the trusts via the Active Directory Domains and Trusts MMC by right-clicking the domain that contains the trust, selecting Properties, and selecting the Trusts tab
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NT 4 Domain Forest Trust External
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FIGURE 11-41 The various trust types: the two large circles are forest trusts
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11
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Notice that the Trusts tab contains a New Trust button It is used to create new trust relationships If you select the forest root domain, you have the option to create a shortcut (another domain in the forest), external, realm, or forest trust No other domain allows the option to create a forest trust The whole process is wizard driven, as shown in Figure 11-42
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FIGURE 11-42 The New Trust Wizard checks on the domain selected and displays the list
of possible trusts available
The next screen of the New Trust Wizard asks for the name of the domain to connect to, which can be a DNS or NetBIOS name Remember that if you want to connect to another forest or DNS named domain, you need to ensure that your DNS server is con gured with a conditional forward for the DNS zone to the authoritative name servers for that zone In this example, I m creating a trust to my main lab domain, which is savilltechnet, from my testing domain, virtsavilltechnet, so I ve already created a conditional forward rule from virtsavilltechnet to savilltechnet After you enter the name, the wizard communicates with the entered name and gives you options for the type of trust you can create Figure 1143 shows a Windows Server 2003 mode forest detected, so you can create a forest trust or an old-style external trust
Trust Relationships
11 DESIGNING AND INSTALLING ACTIVE DIRECTORY
FIGURE 11-43 For another forest, you can create a transitive enabled forest trust or an oldstyle external trust
Depending on the type of trust you select, select options concerning the trust direction The direction can be two-way (two trusts are created, one incoming and one outgoing) or single direction (incoming or outgoing) The wizard also allows you to create the trust on both sides, avoiding the need for this to be a two-step process (see Figure 11-44) If you are the administrator for both sides of the trust, you can elect to create both the local domain and the speci ed domain If different administrative groups govern the domains, each needs to create its side separately If you opt to create both sides, you are prompted for credentials in the other domain that has permissions to create the trust If you selected a Kerberos trust, you are prompted about whether the trust should allow forest-wide authentication capabilities for anyone in the trust or only for selected users This option is also displayed for the other forest if this is a forest trust type Finally, a summary screen appears Click Next to create the trust, and it is listed for the domain You can now grant access to resources from the other side of the trust, as shown in Figure 11-45 If you ever remove the trust, any permissions given no longer function
11
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FIGURE 11-44 If you are an administrator and have credentials for both sides of the trust,
you can elect to create the trust on both domains
FIGURE 11-45 With the forest trust set to savilltechnet, I can now grant its
users/groups/computers access to resources
To remove a trust, select it from the list of trusts and click Remove If it is a bidirectional trust, you are prompted to indicate whether to remove both sides, in which case you must enter credentials for the other domain if it is an outgoing trust (see Figure 11-46)
Summary
FIGURE 11-46 You can easily remove a trust Note that you cannot create or remove trusts established by the AD creation process (that is, parent child and tree root trusts) AD maintains these trusts, and although you can see them, you cannot change them nor should you want to To move domains, use another technique (described in 12), referred to as prune and graft, but it s not nice! You can create trusts from the command line by using the netdom trust command as part of command-line management of AD (see 12)