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Hot Spots: Public Access using 802.11 in .NET Produce QR in .NET Hot Spots: Public Access using 802.11




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614 Hot Spots: Public Access using 802.11 use visual .net qr code 2d barcode generation todisplay quick response code with .net PDF417 28.3 New Trends There are many new trends in Wi-Fi that impact hotspot providers and users. Some of the major trends are: 1) 2) 3) 4) 5) Proliferation of Wi-Fi devices; Multi-purpose access points; Municipal Wi-Fi; Free Wi-Fi/ Advertising; WiMax..

This secti .net framework qr bidimensional barcode on will discuss some of the salient features and challenges presented by these trends. 28.

3.1 Trends in Wi-Fi Enabled Devices Whereas the hotspot industry grew mainly serving notebook computers, the Wi-Fi industry is rapidly changing. Wi-Fi is being incorporated into hundreds of new devices including: PDAs (Palm , Trio , iPac , etc.

); Gaming devices (such as Nintendo DS , Sony Playstation Portable , etc.); Digital cameras; Media players (iPod , Zune , Gigabeat , etc.); Dual mode phones (Wi-Fi and cellular combined phones); Wi-Fi enabled phones (e.

g., using Skype); RFID tags..

One of the biggest problems that hotspot service providers and Wi-Fi-enabled equipment manufacturers face is how to get these devices connected at hotspots. If the device has a browser, then the browser-based connection process described above can be used (albeit very awkwardly unless the device has a keyboard). However, if the device does not have a browser, there is no way for the user to interact with the gateway and perform the Web-based acceptance function.

Especially in a paid hotspot, if the provider allows a Wi-Fi device to access the network without using the Web-based authentication and payment method, then it would be relatively easy for other customers to get around the Web-based method and spoof system to avoid payment. One way of getting these devices to work is for the hotspot providers and equipment manufacturers to work in coordination to enable the devices to work at hotspots. One excellent example of this collaboration is the work done by Wayport, Nintendo, and McDonald s to enable the Nintendo DS Wi-Fi enabled games to work at all of the McDonald s Wayport hotspots.

This was actually a fairly complicated integration project, but took only 3 months to deliver to market (August 15 to November 15, 2005). As with any device that attempts to access the Internet at a McDonald s network, a firewall rule is in place that blocks the access. Wayport engineers worked with Nintendo engineers to develop a system that would recognize and authenticate the device on the network.

A major constraint of the design was that it had to appear seamless to the user. All the user has to do. Hot Spots: Public Access using 802.11 615 is select play an online game from the game menu. The Nintendo DS game software was modified to recognize a McDonald s site by searching for the standard Wayport_Access SSID. Wayport set up another non-broadcast SSID for the Nintendo device to connect.

After association with this SSID and on receiving a DHCP IP address, the DS makes a HTTP request and receives a response that contains a URL to post validation credentials to. The DS then makes a request with this information to a central server that validates the DS device and posts the validated credential response back to the gateway. The gateway accepts the response and modifies the firewall rules to allow the device out onto the Internet.

Note the similarity of the DS authentication system to the roaming authentication described above. In fact, it is nearly identical. This is one way to allow these devices onto the network, but requires a central authentication server.

Clearly this could be turned into a standard method for other device manufacturers to provide access for their devices as well. Wayport currently has plans to develop a freely available software development kit and specification so that any manufacturer can add authentication to their device. Note that the business terms have been left out if this is a paid hotspot the provider may work with the manufacturer to develop business terms for allowing the device onto the network (e.

g., pay some amount per use or pay a flat fee). Whereas the authentication described above works well for certain devices, other devices have no simple means of performing authentication with a central server.

Access control for these devices is much more difficult (see for example [3]), but various methods are being proposed for recognizing the devices and granting access based on information available on the device. 28.3.

2 Trends Multi-Purpose Access Many higher-end commercial access points are capable of supporting multiple SSIDs. Each SSID can be tied to a different VLAN and can have different security settings for each system. For example, some access points with an 802.

11b/g radio can allow for up to 16 SSIDs, each SSID can be independently set to broadcast or non-broadcast mode, and each SSID can be tied to a different virtual LAN. This allows venues to deploy a single wireless network and use it for many different purposes. For example one SSID may be configured for public access tied to a public VLAN with no encryption or security whereas a second SSID may be set to non-broadcast mode with encryption and security (either via WEP or WPA/WPA2).

Examples of applications for this multi-purpose configuration abound. Hotels commonly are configured with public access on one SSID and a private network on the same set of access points to enable VoIP devices such as Vocera or Spectralink. Airports may run a private network alongside a public network.

Some service providers enable an open public SSID along with a public secure connection via WPA on another SSID. Hospitals use these networks for several applications including VoIP, asset tracking, and secure communications for hospital equipment. McDonald s currently is configured with 4 different SSIDs each with different purposes (3 public plus one private plus several different wired applications running alongside the wireless applications on separate VLANs).

Configuration and management of these multi-purpose networks requires some serious network engineering and firewall rule configurations to ensure that the applications perform properly, have the correct QoS, and the correct security. The benefits of such.
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