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Apart from establishing remote login sessions, copying files, and executing commands on remote hosts, you can also use SSH for TCP port forwarding. When used like this, SSH is a simple VPN solution with the capability of tunneling to almost any unsecured protocol over a secured connection. In this section, I ll first talk about X forwarding and then you ll see how to forward almost any protocol using SSH.

Bluetooth is the short-range networking facility that allows various items of hardware to work with each other wirelessly. You can use Bluetooth for everything from file transfers between a mobile phone and computer to employing a wireless keyboard or mouse with your desktop computer. For Bluetooth to work, both devices need to have Bluetooth support. Many mobile phones come with Bluetooth nowadays, as do an increasing number of notebook computers. It s also possible to buy very inexpensive Bluetooth USB adapters.

If we want to select a particular row or rows in the Member table (such as the row for member 323 or rows for members with a handicap less than 10), the database software must scan through every row in the table to check if it meets the condition. Indexes can help make finding particular rows much more efficient.

Bluetooth support is built into Ubuntu and should activate automatically if Bluetooth hardware is present on your PC. You will know if this is the case because a Bluetooth icon will appear in the notification area. This is used to administer all Bluetooth devices that you might want to connect to your computer.

Wouldn t it be useful if you could start an application on a server, where all the workload is performed by the server, while you control the application from your client Well, you can with SSH X forwarding. To use X forwarding, you first must establish an SSH session to the server you want to connect to. Next, from this SSH session, you start the graphical application, which will draw its screen on your workstation while doing all the work on the server itself. Sounds good Establishing such an environment has only two requirements: Make sure the X11Forwarding option is set to yes in /etc/ssh/sshd_config on the server. Connect to the server with the ssh -X command from your client. Alternatively, you can set the X11Forwarding option in the client configuration file /etc/ssh/ssh_config, which allows you to forward graphical sessions by default. This poses a minor security problem, however, and so this setting is not enabled by default on Ubuntu Server. Now that you have established the SSH session with your server, start your favorite graphical program. The program itself will be executed at the remote host, and you ll see the screen locally.

When two pieces of Bluetooth-compatible hardware need to communicate on a regular basis, they can get together, a process also known as pairing or bonding. This means that they trust each other, so you don t need to authorize every attempt at communication between the devices. Indeed, some devices won t communicate unless they re paired in this way. Pairing is simple in practice and works on the principle of a shared personal ID number (PIN). The first Bluetooth device generates the PIN and then asks the second Bluetooth device to confirm it. After the user has typed in the PIN, the devices are paired. Pairing is easily accomplished under Ubuntu and doesn t require any additional software. As an example, the following are the steps for bonding a mobile phone to an Ubuntu PC. Bonding for devices without a user interface, such as keyboards, is handled differently, as explained in the Using a Bluetooth Keyboard or Mouse section a little later in the chapter. 1. Ensure that the Ubuntu PC is visible, which is to say that other Bluetooth devices can detect it. Click the Bluetooth icon in the notification area, select Preferences, and make sure that the Always Visible radio button is selected. Click Close. You can pair up two devices from either end, but we re going to begin using Ubuntu. To do this, click the Bluetooth icon in the notification area and select Set up new device. This launches the Bluetooth New Device Setup. Click the Forward button. The device setup probes the ether and finds any connectable devices. These will appear first as a series of numbers and then using their friendly names, as shown in Figure 7-18.