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When to create a forest trust

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Applies To: Windows Server 2003, Windows Server 2003 R2, Windows Server 2003 with SP1, Windows Server 2003 with SP2

When to create a forest trust

A forest trust can only be created between a forest root domain in one Windows Server 2003 forest and a forest root domain in another Windows Server 2003 forest. Creating a forest trust between two Windows Server 2003 forests provides a one-way or two-way, transitive trust relationship between every domain residing within each forest. Forest trusts are useful for Application Service Providers, companies undergoing mergers or acquisitions, collaborative business extranets, and companies seeking a solution for administrative autonomy.

For more information about creating forest trusts, see Checklist: Creating a forest trust.

Note

You should not enable SID filter quarantining on forest trusts, that is, by using the netdom command with the /quarantine:yes option. However, if you have migrated users from one Windows Server 2003 forest to another and the migrated users need access to resources in the former domain, you can relax the default SID filtering that is applied to a forest trust by using the netdom command with the /enablesidhistory:yes option. Using that command on a forest trust reduces the level of SID filtering on the forest trust. So, ensure that you trust the administrators of the trusted domain, as well as their security practices.

Using one-way forest trusts

A one-way, forest trust between two forests allows members of the trusted forest to utilize resources located in the trusting forest. However, the trust operates in only one direction. For example, when a one-way, forest trust is created between forest A (the trusted forest) and forest B (the trusting forest), members of forest A can access resources located in forest B, but members of forest B cannot access resources located in forest A using the same trust.

Using two-way forest trusts

A two-way, forest trust between two forests allows members from either forest to utilize resources located in the other forest; domains in each respective forest trust domains in the other forest implicitly. For example, when a two-way, forest trust is established between forest A and forest B, members of forest A can access resources located in forest B, and members of forest B can access resources in forest A, using the same trust.