Wireless Networking in Visual C#

Making QR Code in Visual C# Wireless Networking

Wireless Networking
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Typically in a wireless environment, the authentication server is a RADIUS server. Microsoft Windows 2000 Server and Microsoft Windows Server 2003 include the Internet Authentication Service, the Microsoft implementation of a RADIUS server. For wireless connections, Windows XP (SP1 or later) can use either the Extensible Authentication Protocol Transport Layer Protocol (EAP-TLS) (defined by RFC 2716) or the Protected EAP-Microsoft Challenge-Handshake Authentication Protocol version 2 (PEAP-MS-CHAP v2).
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Configuring Wireless Networks
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Microsoft Windows XP supports both infrastructure mode and ad hoc mode wireless network configurations. An infrastructure mode wireless network uses a dedicated device to enable access to the network, either an access point or a router (often called a gateway). An ad hoc mode wireless network is the network used between two wireless clients, such as a pair of Windows XP machines. By default, Windows XP will use either infrastructure mode or ad hoc mode, but it will prefer infrastructure mode.
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Infrastructure Mode
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In an infrastructure mode wireless network, an access point acts as a network bridge between the wired and wireless segments of the local area network (LAN), as shown in Figure 21-1.
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Ethernet (Wired)
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Wireless Access Point Wireless link Wireless link
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Figure 21-1
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A typical Infrastructure Mode wireless network using an access point
Part III:
Security
In an infrastructure mode wireless network that uses a wireless gateway, as shown in Figure 21-2, there are generally several wired ports and a wireless access point combined on one segment that is then routed out a wide area network (WAN) port to connect either to the rest of the network or to the Internet.
Wireless Gateway Internet Wireless link Wireless link
Ethernet (Wired)
Figure 21-2
A typical Infrastructure Mode wireless network using a wireless router
When a Microsoft Windows XP computer with a wireless network adapter starts up, or when the wireless adapter is enabled if it has been disabled, it automatically actively scans the wireless frequencies it supports for wireless access points or other wireless clients. If it finds a Service Set Identifier (SSID) that is on its preferred list of wireless networks, and it is configured for automatic connection, it will negotiate a wireless port with the access point, creating an association. If the signal strength is low or the error rate is high, the wireless client will scan for other wireless access points, looking for a stronger signal. If it finds another access point on the same network that can provide a better signal, it can negotiate a new association with that access point. This is known as reassociation. As a wireless client moves about within the range of a wireless network, it can associate and reassociate with the available wireless access points with no change in IP address or configuration. Windows XP will interpret the reassociation as a media disconnect/connect event, causing Windows XP to perform a DHCP renewal. If the reassociation is with an access point on the same subnet and with the same SSID, there will be no change in IP address and the process will be completely transparent to the user. If, however, it is no longer able to associate with a wireless access point with the same SSID or on the same subnet, it will reassociate with the new access point but will get a new IP address that is valid in the context of the new association.
21:
Wireless Networking
Ad Hoc Mode
When no access point is available, wireless clients can communicate directly with each other in ad hoc mode, as shown in Figure 21-3. Ad hoc mode is sometimes referred to as peer-to-peer mode.
Wireless link
Wireless link
Wireless link
Figure 21-3
A typical wireless network with clients using ad hoc mode
The first client in an ad hoc mode network performs some of the roles of an access point, including periodic broadcast of the SSID and the authentication of new members to the ad hoc network. The client does not, however, act as a bridge between the wireless network and a wired network. Wireless clients must be explicitly configured to use ad hoc mode, and there are a maximum of nine clients in an ad hoc wireless network.
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