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Because all inbound traffic is dropped unless it has been specifically requested from an internal network client, ICF blocks some types of traffic that can be potentially dangerous, but might also be wanted on your network. For example, all incoming ICMP traffic (such as ping requests) is blocked as well as all Remote Desktop traffic originating from outside the LAN. Because you might want to allow ICMP or Remote Desktop traffic, ICF provides a way to override the table configuration for certain services, which you can learn more about in Enabling Services on page 130.

Roaming user profiles are configured by means of the user object contained in the Active Directory directory service on the domain controller. For more information about configuring roaming user profiles on Microsoft Windows 2000 Server, see the Distributed Systems Guide of the Microsoft Windows 2000 Server Resource Kit. Roaming user profile considerations for mobile users The following guidelines can be used when planning profile configurations for users of mobile computers:

If the user regularly connects to the network via fast link, consider using a roaming user profile. If the user rarely connects via fast link, use a local profile. By default, roaming user profiles do not roam over slow links. For example, if a user in the field generally connects via a dial-up connection but comes into the office twice a year and connects via the LAN, a roaming profile offers little advantage because the server copy would be up-to-date only on those two occasions. If the user roams to LAN-connected computers in the domain and also has a laptop computer, use a roaming user profile for the user. For the laptop computer, enable the Group Policy setting Only allow local user profiles. Note that a Computer Configuration Group Policy setting takes precedence over a User Configuration setting, so the user will receive his or her User setting on desktop computers but will receive the Computer setting on the laptop computer.

Windows XP Professional includes new Group Policy settings, support for Windows XP Professional fast network logon, and more robust roaming. These features increase the usability, resilience, and performance of roaming user profiles.

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The Group Policy settings that you use to manage user profiles have been moved to their own folders in the Group Policy snap-in, under Computer Configuration\Administrative Templates\System\User Profiles and User Configuration\Administrative Templates\System\User Profiles. In addition, three new Computer Configuration settings are available with Windows XP Professional. Prevent roaming-profile changes from propagating to the server Determines whether changes users make to their roaming profiles are merged with the server copy of the profile. If this policy is set, users receive their roaming profiles when they log on, but any changes they make to their profiles will not be merged to their roaming profiles when they log off. Add the Administrators security group to roaming user profiles In Windows XP Professional, the default file permissions for newly generated roaming profiles are full control for the user and no file access for the Administrators group. By default, an administrator must take

Part II:

Concerning the naming of foreign keys, it s good practice to define them by using the same name as their primary key counterpart; otherwise, it might lead to problems for people looking at your logical data model I introduced you to data integrity earlier in this chapter When doing so, I cited an example that could create similar problems to the one in the Product and OrderDetail example Adding a foreign key constraint between these two tables would prevent a user from deleting a product in the Product table that could potentially create a large number of orphaned rows in the OrderDetail table If you look at Figure 8-1, the foreign key constraint between Product and OrderDetail is shown as a line labeled FK_Product_OrderDetail between the two tables Naming constraints is an easy way to understand their purpose.

Understanding ICF and Protocols ICF works on a table basis, not on a protocol-by-protocol basis. Although some firewalls allow you to block certain protocols, ICF is concerned with keeping traffic that is not explicitly requested from entering the local computer or network. For this reason, ICF does not place any restrictions on protocols. If you want to download