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Internet!connecting|(

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NetworkManager

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\marginscreenshot{03-connection-states-icons.png}{ss:connection-states-icons}{Different connection states and their respective icons.} In order to connect to the Internet using Ubuntu, you need to use the \application{NetworkManager} utility. \application{NetworkManager} allows you to turn network connections on or off, manage wired and wireless networks, and make other network connections, such as dial up, mobile broadband, and VPN's.

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\marginscreenshot{03-active-connection.png}{ss:active-connection}{Here you can see the currently active connection is ``Wired connection 1.''} You can access \application{NetworkManager} by using its icon found the top panel. This icon may look different depending on your current connection state. Clicking this icon will reveal a list of available network connections. The current connection (if any) will have the word ``disconnect'' underneath it. You can click on ``disconnect'' to manually disconnect from that network.

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This menu also allows you to view technical details about your current connection or edit all connection settings. In the image to the right you will see a tick mark next to ``Enable Networking.'' Click on the tick mark to disable all network connections. Clicking a second time will enable networking again. This can be very useful when you are required to turn off all wireless communications, like in an airplane.

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Establishing a wired connection

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\marginnote{Are you already online? If the NetworkManager icon in the top panel shows a connection then you may have successfully connected during the Ubuntu setup process. You can also simply open a browser and see if you have access to the Internet. If so, you do not need to do anything for the rest of this section.} If you have an \emph{Ethernet} cable running from a wall socket or networking device, such as a switch or router, then you will want to setup a wired connection in Ubuntu.

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In order to connect to the Internet with a wired connection, you need to know whether your network supports \gls{DHCP} \emph{(Dynamic Host Configuration Protocol)}. \acronym{DHCP} is a way for your computer to automatically be configured to access your network and/or Internet connection. \acronym{DHCP} is usually automatically configured on your router. This is usually the quickest and easiest way of establishing a connection to the Internet. If you are unsure whether your router is setup to use \acronym{DHCP}, you may wish to contact your \gls{ISP}'s \emph{(Internet Service Provider)} customer service line to check. If your router isn't configured to use \acronym{DHCP} then they will also be able to tell you what configuration settings you need in order to get online.

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Automatic connections with DHCP

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\marginscreenshot{03-connection-information.png}{ss:connection-information}{This window displays your \acronym{IP} address and other connection information.} If your network supports \acronym{DHCP} then you may already be set up for online access. To check this, click on the NetworkManager icon. There should be a ``Wired Network'' heading in the menu. If ``Wired connection 1'' appears directly underneath, then your machine is currently connected and probably setup for \acronym{DHCP}. If ``Disconnected'' appears in gray underneath the wired network section, look below to see if an option labeled ``Wired connection 1'' appears in the list. If so, click on it to attempt to establish a wired connection.