HOW TO AIRPORT EXPRESS AS A RANGE EXTENDER
In the previous section I taught you how to set up an Airport Express (wireless router) device with its own wireless network. This was done with the aid of an ethernet cable that connected the airport express device to a NetGear DGN1000 wireless modem/router whereby once they were connected the airport express device could then have its own wireless network running off the internet connection provided by the NetGear DGN1000 wireless modem/router. This meant any laptop, ipad or iphone for example wanting an internet connection would have to connect to the wireless network associated with the airport express device. The main advantage of this kind of setup is that you are now allowing those devices to connect to a wireless router that operates on a 5.0 Ghz frequency, as opposed to a 2.4 Ghz frequency, which results in less interference and drop-out.
In this section I will teach you how to wirelessly connect an Airport Express device to an existing wireless network that is associated with a wireless modem/router, as
opposed to creating a new wireless network like in the previous section. In other words, the airport express device will be connected wirelessly to the wireless
modem/router's wireless network. This means the airport express device is joining (connecting to) that wireless network and not its own, in the same way an ipad would
join that wireless network. The advantage of this is that you can then take the airport express device, now connected wirelessly to the wireless modem/router's wireless
network, into another room and then attach it to a networked hard drive, standard printer, apple tv or other internet based gadget.
Now that the previously connected wireless network has been forgotten, the next step is to get the Airport Utility application and OS X (Mountain Lion) to recognize the airport express device again. This is done by clicking on the OTHER AIRPORT BASE STATIONS (1) drop-down menu in the top left corner of the Airport Utility application window and selecting your airport express device (base station), which should be the only one available. In this case the Airport Express 0caa7e.
As the airport express device has been reset to factory settings and been told to forget the previously connected wireless network, the Airport Utility application is forced to set up the airport express device again; from scratch.
You will know when the airport express device has been, initially, set up (pre-configured) because the Airport Utility application window will display the first step of its Installation Wizard, which contains the standard "Create A Network" message and the options (buttons and menus) for creating a new wireless network or joining/extending an existing wireless network. In the example below, because you will not be creating a new wireless network, you will need to click on the OTHER OPTIONS button to proceed.
When the Other Options appear the default setting (default option) called CREATE A NEW NETWORK will be selected. However, because you want to join an existing wireless network you need to select the setting (option) called ADD TO AN EXISTING NETWORK instead before clicking on the NEXT button.
The next step of the Installation Wizard (Airport Utility application) is to ask you which wireless network you want to join (connect to). By default you should see your currently connected, wireless modem/router, wireless network listed as the first choice, but if you have more than one wireless network available (i.e. one modem/router wireless network and a neighbour's wireless network) you can select one of them from the CONNECT TO drop-down menu. Once you have a wireless network selected click on the NEXT button to continue.
With a wireless network selected you are then asked to enter a password for the airport express device (base station). Simply type your preferred password into the PASSWORD edit box, verify it by typing it into the VERIFY edit box and then click on the NEXT button. Airport Utility will then set up the rest of the airport express device for you whereby it is then connected to (joined to) the wireless network you have just selected and therefore using its internet connection wirelessly.
Note Well - The password you enter here is for the Airport Express device (Base Station) only. When joining an existing wireless network the installation wizard knows it should use the already logged in, existing, wireless network's password; that it gets from the keychain. If you are currently logged out of the existing wireless network (the wireless network you want to join) you will be asked for its password.
When you see the 'Setup Complete' message click on the DONE button (above) - You should then see following diagram with green lights, indicating a valid internet connection and joining of the selected wireless network.
So just to clarify; In the above set up process I did not have the airport express device connected to an ethernet cable. The joining of (connection to) the Yoingco wireless network was made purely by the airport express device's built-in router that was able to detect (pickup) and join the Yoingco wireless network wirelessly without cables.