Introduction to Domain and Forest Trusts

By using Windows Server 2003 domain and forest trusts, service administrators can create or extend collaborative relationships between two or more domains or forests. Windows Server 2003 domains and forests can also trust Kerberos realms and other Windows Server 2003 forests, as well as Microsoft Windows® 2000 domains and Windows NT® 4.0 domains.

When a trust exists between two domains, the authentication mechanisms for each domain trust the authentications coming from the other domain. Trusts help to provide controlled access to shared resources in a resource domain (the trusting domain) by verifying that incoming authentication requests come from a trusted authority (the trusted domain). In this way, trusts act as bridges that allow only validated authentication requests to travel between domains.

How a specific trust passes authentication requests depends on how it is configured. Trust relationships can be one-way, providing access from the trusted domain to resources in the trusting domain, or two-way, providing access from each domain to resources in the other domain. Trusts are also either nontransitive, in which case a trust exists only between the two trust partner domains, or transitive, in which case a trust automatically extends to any other domains that either of the partners trusts.

In some cases, trust relationships are established automatically when domains are created; in other cases, administrators must choose a type of trust and explicitly establish the appropriate relationships. The specific types of trusts that are used and the structure of the resulting trust relationships in a given trust implementation depend on such factors as how Active Directory is organized and whether different versions of Windows coexist on the network.
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To block all Internet traffic to and from a computer you need to create an IPSec policy that will block all HTTP traffic. You can configure this policy specifically for one computer by manipulating that computers' IPSec policy, or, even better, you can configure the policy as a Group Policy Object (GPO) on a specific Site, Domain or Organization Unit (OU). In order to configure a GPO you must have Active Directory in place.

Block a single computer from surfing on the Internet

To configure a single computer follow these steps:

Configuring IP Filter Lists and Filter actions

  1. Open an MMC window (Start > Run > MMC).

  2. Add the IP Security and Policy Management Snap-In.

 

  1. In the Select which computer this policy will manage window select the local computer (or any other policy depending upon your needs). Click Close then click Ok.

 

  1. Right-click IP Security Policies in the left pane of the MMC console. Select Manage IP Filter Lists and Filter Actions.

 

  1. In the Manage IP Filter Lists and Filter actions click Add.

 

  1. In the IP Filter List window type a descriptive name (such as HTTP, HTTPS) and click Add to add the new filters.

 

  1. In the Welcome window click Next.

  2. In the description box type a description if you want and click Next.

 

  1. In the IP Traffic Source window leave My IP Address selected and click Next.

 

  1. In the IP Traffic Destination window leave Any IP Address selected and click Next.

 

  1. In the IP Protocol Type scroll to TCP and press Next.

 

  1. In the IP Protocol Port type 80 (for HTTP) in the To This Post box, and click Next.

 

  1. In the IP Filter List window notice how a new IP Filter has been added. Now, if you want, add HTTPS (Any IP to Any IP, Protocol TCP, Destination Port 443) in the same manner.

 

  1. Now that you have both filters set up, click Ok.

 

Note: A quick reminder - You can also Block Web Browsing but Allow Intranet Traffic with IPSec.

  1. Back in the Manage IP Filter Lists and Filter actions review your filters and if all are set, click on the Manage Filter Actions tab. Now we need to add a filter action that will block our designated traffic, so click Add.

 

  1. In the Welcome screen click Next.

  2. In the Filter Action Name type Block and click Next.

 

  1. In the Filter Action General Options click Block then click on Next.

 

  1. Back in the Manage IP Filter Lists and Filter actions review your filters and if all are set, click on the Close button. You can add Filters and Filter Actions at any time.

 

Next step is to configure the IPSec Policy and to assign it.

 


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