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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 whenever they want to grab a file Protocols such as BitTorrent, too, rely on many incoming connections Also, 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 certain types of inbound connections through In the terminology of Firestarter (and many firewall programs), 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 configure Firestarter to allow.

This is a restrictive policy and can be useful in blocking certain types of programs that phone home with personal data about you, such as spyware..

Your network probably has a lot of computers that need an IP address and other IP-related information in their configuration. You can, of course, enter all of this information by hand on each individual workstation, but it s much easier to automate this process with a DHCP (dynamic host configuration protocol) server. Let s see how to set this up on Ubuntu Server.

Note Unlike with Windows, we ve never heard of a Linux program that contains spyware that phones home in

What will be the impact of adding a nonclustered index on LastName to the Member table To illustrate the difference, I ve used the SQL Server query analyzer to compare the query on two identical tables: one, renamed MemberIndex, with an index on LastName, and one without an index on that column. Figure 9-9 shows the result. As you can see, the index speeds up this query significantly. This is because all the last names are kept in order in the index.

A restrictive policy can also prevent certain types of viruses and worms from spreading. The downside of a restrictive policy is that you must configure Firestarter to take into account every type of outgoing data connection that you do want to allow through, 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.

DHCP is a broadcast-based protocol A client that s configured to obtain an IP address via DHCP sends a broadcast on startup to try to find one or more DHCP servers in the network The client uses the DHCPDISCOVER packet to do this If a DHCP server sees the DHCPDISCOVER packet coming by, it answers with a DHCPOFFER packet, in which it offers an IP address and related information If the client receives a DHCPOFFER from more than one DHCP server, it chooses only one It s very difficult to determine beforehand with what IP configuration information the client will work, which is one of the reasons why you should take care that no more than one DHCP server is available per broadcast domain to offer a configuration to the DHCP clients.

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

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

However, if we ask for extra fields to be retrieved by the query, as in Listing 9-14, the additional cost of having to look up the values of the other fields must be taken into account.

To indicate that the client wants to use the IP address and related information offered by a DHCP server, it returns a DHCPREQUEST, thus asking to work with that information The DHCP server then indicates that that s okay by returning a DHCPACK (acknowledgement) to the client From this moment on, the client can use the IP address A lease time is associated with each offering from a DHCP server, and this lease time determines how long the client can use an IP address and associated information Before the lease ends, the client has to send another DHCPREQUEST to renew its lease In most cases, the server answers such a request by extending the lease period and sending the client a DHCPACK If, for some reason, it s not possible to extend the lease, the client receives a DHCPNACK (negative acknowledgement).