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Firestarter works by controlling the data that goes in and out of your computer via your Internet or network connection. By default, it blocks every type of uninvited inbound connection but allows every type of outbound connection. This needs some explanation. Whenever you click a link on a web page, your computer sends a request for data to the web server hosting the web page. Within a few milliseconds, that data will be sent to your computer. This is an inbound data connection. The Linux firewall is clever enough to realize that the data was requested by you, so it is allowed through. However, any uninvited connections are turned away. If, out of the blue, someone attempts to connect to your computer via the popular Secure Shell (SSH) tool, as just one example, he won t be allowed to make that connection. This is a good thing because it makes your computer secure. Crackers are turned away whenever they try to connect, no matter how they try to connect. But in some circumstances, allowing uninvited connections is useful. For example, if you create a shared folder for other computers in your office to connect to, they will frequently make uninvited inbound connections to your computer. And if you want to make use of SSH to connect to your computer remotely, you will need to allow such incoming connections. Therefore, Firestarter lets you allow through certain types of inbound connections.

Outbound traffic is any kind of data originating on your computer that is sent out on the network and/or Internet. By default, Firestarter allows out all data, no matter what it is. This is described as a permissive policy. But Firestarter can be configured to block all outgoing connections apart from those you opt to allow through. This is described as a restrictive policy and can be useful in blocking certain types of programs that phone home with personal data about you, such as spyware. It can also prevent certain types of viruses and worms from spreading. The downside is that you must configure Firestarter to take into account every type of outgoing data connection, such as those for web browsers, instant messaging programs, and so on. You can configure Firestarter by clicking the Policy tab in the main program window. Click the Editing drop-down list and choose to configure either the inbound traffic policy or the outbound traffic policy.

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When applying these limitations, you should remind yourself of the difference between hard and soft limits: a hard limit is absolute, and a user cannot exceed it. A soft limit can be exceeded, but only within the settings that the administrator has applied for these soft limits. If you want to set the hard limit to the same as the soft limit, use a character, as seen in the previous code example for the group student.

In this chapter, you saw how to use the following T-SQL keywords to perform data manipulation tasks against a database: SELECT INTO, SELECT, INSERT, UPDATE, and DELETE. You also saw how to use comparison and other operators to specify predicates that limit what rows are retrieved or manipulated. In the next chapter, you will see how stored procedures work.

Note Firestarter is used only to configure the built-in firewall and doesn t need to be running for the firewall

This useful module looks at the user s mail directory and indicates whether there is any new mail. It is typically applied when a user logs in to the system with the following line in the relevant PAM configuration file: login session optional pam_mail.conf

to work. Once you ve finished configuration, you can quit the program. You ll need to use it again only if you wish to reconfigure the firewall.

tored procedures are SQL statements that allow you to perform a task repeatedly. You can create a procedure once and reuse it any number of times in your program. This can improve the maintainability of your application and allow applications to access the database in a uniform and optimized manner. The goal of this chapter is to get you acquainted with stored procedures and understand how Visual Basic .NET (VB .NET) programs can interact with them. In this chapter, we ll cover the following: Creating stored procedures Modifying stored procedures Displaying definitions of stored procedures Renaming stored procedures Working with stored procedures in VB .NET Deleting stored procedures

If a user authenticates to a machine for the first time and doesn t have a home directory yet, pam_mkhomedir can be applied to create this home directory automatically. This module will also make sure that the files in /etc/skel are copied to the new home directory. This module is especially useful in a network environment in which users authenticate through NIS or LDAP and do not always work on the same machine. However, it s recommended in such situations to centralize user home directories on an NFS server so that no matter where a user logs in to a server, a home directory will always be present. 8 contains more information about configuring an NFS server. The disadvantage of pam_mkhomedir is that if the module is not applied correctly, a user may end up with home directories on many different machines in your network.

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