DISCONNECT FROM A WIRELESS NETWORK in Objective-C

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DISCONNECT FROM A WIRELESS NETWORK
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To disconnect from a wireless network, turn your Mac s AirPort off:
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If the AirPort icon is displayed on the menu bar, click it to open the menu, and click Turn AirPort Off Or Open the menu and click System Preferences, click Network, and select AirPort in the left list box Click the Turn AirPort Off button Open the System Preferences menu and click Quit System Preferences to close System Preferences
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IP address When you connect your broadband router or your Mac to the Internet, your ISP assigns it an IP address from the block of IP addresses allocated to the ISP For a typical dial-up connection, the IP address is dynamic, meaning that it is likely to be different each time you establish the connection: the ISP allocates one of the addresses assigned to its modem pool For a typical broadband connection, the IP address is static, meaning that you keep the same IP address all the time
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Set Up a Computer-to-Computer Wireless Network
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If you don t have an access point, you can set up a computer-to-computer wireless network by using a Mac as a software access point This capability means that one Mac starts broadcasting an SSID and other Macs can join the network Computer-to-computer networks work well for small numbers of computers, but if you plan to add more than a half-dozen computers to your wireless network, an access point will give you better results
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(your ISP reserves the IP address for you) NETWORK ADDRESS TRANSLATION To reduce the number of computers directly connected to the Internet, many networks use a process called
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Network Address Translation (NAT) In NAT, one computer (or a special-purpose device, such as a router) Continued
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UICKSTEPS
UNDERSTANDING TCP/IP ESSENTIALS (Continued)
is connected to the Internet and has an IP address on the Internet The NAT computer shares the Internet connection with the other computers on the internal network as required, funneling Internet requests and replies through its IP address This process is often compared to the mailroom in a building, through which all incoming and outgoing mail is directed GET AN IP ADDRESS IP addresses can be allocated either manually or automatically Manual allocation is handy for some situations (such as when you need a particular computer to keep the same IP address), but automatic allocation is the norm for most networks because it is more efficient Most automatic allocation is performed by a DHCP (Dynamic Host Configuration Protocol) server, either at your ISP (for an Internet connection) or on your local network
To set up a computer-to-computer wireless network:
1 2
Turn on your Mac s AirPort (as described in the previous section) Display the Create A Computer-To-Computer sheet:
If the AirPort icon is displayed on the menu bar, click it to open the menu, and then
click Create Network Mac OS X displays the Computer-To-Computer dialog box, which is shown in Figure 9-7 with all its options displayed
Otherwise, open the menu and click System Preferences, click Network, and
select AirPort in the left list box Choose Create Network in the Network Name drop-down list box Mac OS X displays the Computer-To-Computer sheet
3 4
Type the name for the network in the Name text box Choose the wireless network channel in the Channel drop-down list box In most cases, the best choice is Automatic (11) unless you know you need to use another channel to avoid conflicts with an existing wireless network If you want to protect the network with a password (which is usually a good idea), select the Require Password check box The lower part of the Computer-ToComputer dialog box or sheet will appear
When your Mac detects that no DHCP server is available, it falls back on Automatic Private IP Addressing (APIPA) APIPA assigns an IP address in the address range 16925400 through 169254255255 and checks that no other computer on the network is using that IP address (and if one is, changes the IP address until it is unique on the network)
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