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After configuring a network card, you want to make sure it s working correctly For this, the ping command is your friend, and more so because it s easy to use: enter the command followed by the name or address of the host you want to test connectivity to, such as ping wwwubuntucom This forces ping to start continuous output, which you can interrupt by using the Ctrl+C key sequence You can also send a limited number of packets; for example, the command ping -c 3 1921681254 sends just three packets to the specified host If you use ping in a clever way, you can test a lot of things with it I recommend using it in the following order: 1 Ping the localhost If you pass this test, you ve verified that the IP stack on your local machine is working properly 2.

You should be aware of a few important differences between the Windows and Ubuntu versions of Device Manager Though the aim of Ubuntu s Device Manager is to manage hardware devices, the project is still in its infancy and can provide only hardware information at the time of this writing On the other hand, Ubuntu s list is far more comprehensive than that in Windows In Ubuntu, Device Manager thoroughly probes the hardware to discover its capabilities Perhaps the biggest difference, however, is that just because a piece of hardware is listed within Ubuntu s Device Manager doesn t mean that the hardware is configured to work with Ubuntu In fact, it doesn t even imply that the hardware will ever work under Ubuntu.

If we wanted to find the number of entries for a different member, we would need to rewrite the statement in Listing 8-16 with a different WHERE clause. If we wanted to find the counts for all members, that would get very tedious. Grouping allows us to find the counts for all members using one SQL statement. The key phrase GROUP BY is used to do this. Look at the SQL in Listing 8-17.

Device Manager s list is simply the result of probing devices attached to the various system buses (PCI, AGP, USB, and so on) and reporting the data Nonetheless, Device Manager is the best starting place if you find that a certain piece of hardware isn t working If a piece of hardware is listed, then it proves, if nothing else, that the system recognizes that the hardware is attached For example, later in this chapter, we describe how you can use Device Manager to discover crucial details about wireless network devices, which you can then use to install drivers..

Ping a machine on the local network by using its IP address: if this works, you ve verified that IP is properly bound to the network board of your server and that it can make a connection to other nodes on the network If it fails, you need to check the information you ve entered with the ifconfig or ip commands; you may have made an error entering the subnet mask for your network interface 3 Ping a machine on the Internet using its IP address A good bet is 1376511, which is a name server that hasn t failed me in the last 15 years Of course, you can use any other host as long as you know its IP address If the ping is successful, you ve verified that the routers between the localhost and the destination are all working.

Unlike some versions of Linux, Ubuntu doesn t rely on a centralized configuration software package. Instead, it uses smaller programs to configure hardware. For example, to configure the network, you ll use the NetworkManager program, and printers are configured using a separate printer configuration program. Because using some of the configuration software involves reconfiguring your entire system, doing so requires administrator privileges. Therefore, you ll be prompted for your login password each time you use some of the programs. In some cases, after you ve made changes, you ll need to click the Apply button to put the changes into effect. When you ve finished configuration, simply close the program window by clicking the Close button.

Note Ubuntu remembers your password for 5 minutes after you enter it. Therefore, if you open the same application or another that requires administrator privileges within that amount of time, you won t be prompted to enter your password again.