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492.

\marginscreenshot{03-autoeth.png}{ss:network-manager-menu}{Here you can see the currently active ``auto eth$0$'' connection listed in the NetworkManager menu.}

493.

Clicking this icon will bring up a list of network connections that are available to you. If you are currently connected to the Internet, the name of this connection will be highlighted in bold.

494.

This menu also includes options to let you enable or disable networking, view technical details about your current connection, or edit all connection settings. In the image above, the check box next to \checkbox{Enable Networking} is currently selected; you can deselect it to disable all network connections. This may be useful if you need to shut off all wireless communication, such as when in an airplane.

495.

Establishing a wired connection

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If you have an \emph{Ethernet} cable running from a wall socket, a router, or some other device, then you will want to set up a wired network connection in Ubuntu.

497.

\gltodo{``\acronym{DHCP},'' ``\acronym{ISP}''} \marginnote{Are you already online? If the NetworkManager icon in the top panel shows a connection, then you may have successfully connected during the installation process. If so, you do not need to follow the rest of this section.} In order to connect with a wired connection, you need to know whether your network connection supports \gls{DHCP}. \emph{Dynamic Host Configuration Protocol}, is a way for computers on your network to automatically receive configuration information from your Internet service provider (\gls{ISP}). This is usually the quickest and easiest way of establishing a connection between your computer and your \acronym{ISP} in order to access the Internet, although some \acronym{ISP}s may provide what is called a \emph{static address} instead. If you are unsure whether your \acronym{ISP} supports \acronym{DHCP}, you may wish to contact their customer service line to check. They will also be able to provide you with information on your static address if one has been allocated to you (in many cases \acronym{ISP}s only allocate static addresses to customers upon request).

498.

Automatic connections with DHCP

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If your network supports \acronym{DHCP}, 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 that is displayed. If ``Auto eth$0$'' appears directly underneath, then your computer is currently connected and probably already set up correctly for \acronym{DHCP}. If ``disconnected'' appears in gray underneath the wired network section, look below to see if an option labeled ``Auto eth$0$'' appears in the list. If so, click on it to attempt to establish a wired connection.

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To check if you are online, click on the NetworkManager icon in the top panel and select the \menu{Connection Information} option.

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\marginscreenshot{03-connection-information.png}{ss:connection-information}{This window displays your \acronym{IP} address and other connection information.}