vb.net barcode library Click the NetworkManager icon in the notification area, and then select Manual in Java

Draw Code 3 of 9 in Java Click the NetworkManager icon in the notification area, and then select Manual

1. Click the NetworkManager icon in the notification area, and then select Manual
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Configuration.
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2. Click the Unlock button in the dialog box that appears. Supply your password
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when prompted, and then click the Authenticate button.
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3. Find your network device in the list. It should be referred to as Wired Connection.
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Click its entry, and then click Properties.
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4. In the dialog box that appears, uncheck the Enable Roaming Mode check box. This
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overrides NetworkManager s capability to automatically manage the device and allows you to manually configure the device. In the Configuration drop-down list, make sure Static IP Address is highlighted. In the IP Address, Subnet Mask, and Gateway Address text boxes, fill in the relevant details. Figure 8-2 shows an example of these settings. Click OK after filling in the information.
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Figure 8-2. Ubuntu will automatically work with DHCP networks, or you can define a static IP address.
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5. Click the DNS tab in the Network Settings dialog box. 6. Click the Add button, and then type the first DNS address. Press Enter when you ve
finished. Click Add again, and enter the second DNS address, if you have been given one, and then enter a third if you were given one.
CHAPTER 8 GETTING E VERYTHING UP AND RUN NING
Tip If you re using a static IP address with a router, such as that provided by a DSL modem, the DNS
address will probably be the same as the router/gateway address.
7. Click the Close button.
Your network connection should now work. If you find it isn t working, try rebooting. However, if your system administrator mentioned that a proxy must also be configured, you ll also need to follow the instructions in the Working with a Proxy Server section later in this chapter.
Connecting to a Wireless Network
A wireless (Wi-Fi) network is, as its name suggests, a network that does away with cabling and uses radio frequencies to communicate. It s more common for notebooks and handheld computers to use wireless connections, but some desktop computers also do. Indeed, it s increasingly the case that many workplaces are switching to wireless networking, eschewing old-fashioned, cable-based networking.
Note Slowly but surely. Wi-Fi is replacing wired Ethernet networks, but there are many situations in which
Wi-Fi networks are impractical or simply undesirable. For example, the metal infrastructure in some buildings means the signal becomes unreliable. Wi-Fi is also considered too insecure for some companies. The Wi-Fi signal often spreads to the street outside the building. Although such transmissions are nearly always secured, Wi-Fi security implementations have been broken, although WPA2 is considered secure right now. Ethernet might be considered old technology, but trying to steal data from physical cables is an order of magnitude more difficult, to the point of being practically impossible.
Notebooks and PDAs typically use built-in wireless network devices, with an invisible antenna built into the case. However, some notebooks might use PCMCIA cards, which will have an external square antenna, and some desktop computers might use PCI-based wireless cards, which have external rubber/plastic antennas, in the style of old cell phones. Ubuntu includes support for most wireless network devices. However, it s possible to use Windows wireless network device drivers for unsupported hardware. Also, sometimes Ubuntu appears to support a wireless network device, in that it identifies it and lets you configure it, but you might find that it simply doesn t work (or works very badly, perhaps with an intermittent connection). In this situation, you can also try installing Windows drivers. See the Installing Windows Wireless Network Device Drivers section later in this chapter for details.
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Note Ubuntu is rare in the Linux world in that it uses some proprietary (closed source) wireless device
drivers by default. Ubuntu is, after all, an open-source operating system and is committed to the goals of open-source software. The use of proprietary drivers is a necessary evil because not all devices have opensource drivers right now, and not all open-source drivers support all the functions you might be used to (typically they might not support the WPA functionality of your Wi-Fi device, for example). The use of proprietary drivers is only a stopgap measure, and it s hoped that open-source driver development will catch up, making proprietary drivers redundant.
Connecting to a wireless network device is easy with NetworkManager. Just click the NetworkManager icon, and you will see the available Wi-Fi networks in the Wireless Network list. Networks protected with WEP/WPA will have an icon of a padlock. Those that are open will not have this icon. You might see many Wi-Fi networks listed, depending on your location. The wireless base stations are identified by their Service Set Identifier (SSID) or sometimes ESSID, with E standing for Extended. If the SSID you would like to connect to is not listed by NetworkManager, it could mean that your wireless base station isn t set to broadcast its SSID or, worse, Ubuntu s Wi-Fi drivers aren t functioning correctly. If it s the former, all you need to do is right-click the NetworkManager icon and select Connect to Other Wireless Network. Then, in the new dialog box, type the SSID under Network Name, set Wireless Security to none or the appropriate security type, fill in the other information depending on the type of wireless security you selected, and click Connect. If it s the latter, you may need to use a Windows driver, as described in the next section.
Tip If you are not offered any wireless networks at all, ensure the wireless hardware is switched on. Some
notebooks have a keyboard combination to turn it off to save battery power. Additionally, try right-clicking the NetworkManager icon and ensuring that the wireless networking hardware is activated.
To connect to a Wi-Fi network, select the wireless base station you wish to connect to in the list. If it isn t protected by WEP/WPA, you will be connected to it automatically. If the Wi-Fi network you wish to connect to is protected with WEP or WPA, a dialog box will appear, prompting you for the password/passphrase, as shown in Figure 8-3. In the Wireless Security field, make sure the correct type of security for the wireless network is selected don t assume it s automatically correct! By default, the password/passphrase is obfuscated by circle characters so that anyone looking over your shoulder can t see what you re typing. If it helps (and if your shoulder is clear!), check the Show Password box. This can really handy when you re typing a particularly long passphrase.
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