Guide to Wireless LAN Analysis 35 in .NET Include QR Code 2d barcode in .NET Guide to Wireless LAN Analysis 35

Guide to Wireless LAN Analysis 35 generate, create quick response code none on .net projects .NET CF Figure 2.8: Hierarchical tree view of WLAN. Figure 2.9: A physical representation of network users. Security issues are not visual .net qrcode always malicious. Even with well-established security policies in place, well-intentioned users can be inadvertently violating these policies due to misconfigured security settings or even just an overall lack of knowledge of wireless security.

With some analyzers, security policies established around common operating procedures like those illustrated in Figure 2.11, can be monitored in real time, providing instantaneous alerts when a single client is in violation of the policy. 2.

3.4 Troubleshooting - Analyzing Higher Level Network Protocols Managing a network is more than just managing Ethernet or the WLAN. It also means making sure all the resources users expect to access over the network remain available.

This means troubleshooting the network protocols that support these resources. When WLANs are used to extend and enhance wired networks, there is no reason to expect the behavior of higher level protocols on these mobile clients will be any more or less prone to problems than on their wired equivalents..

Guide to Wireless LAN Analysis Figure 2.10: A sample of Wireless Expert Events. Although part of this wo rk can be done by capturing traffic from the wired network alone, some problems will yield more quickly to analysis of wireless-originated traffic captured before it enters the DS. To determine whether access points are making errors in their bridging, or if packets are being malformed at the client source, you must be able to see the packets as they come from the client node, as shown in Figure 2.12.

In an all-wireless environment, the only way to troubleshoot higher level protocols like TCP/IP is to capture the packets off the air. In smaller satellite offices in particular, this all-wireless solution is increasingly common. It offers quick setup and can cover areas that would be awkward to serve with wiring, such as non-contiguous office spaces on the same floor.

The only wired part of such networks may be the connection from the DSL modem, through the router to the access point.. Figure 2.11: Wireless Network Policies. Guide to Wireless LAN Analysis 37 Figure 2.12: Partial Example of a Detailed Packet Decode. The actual troubleshooti ng of these higher level protocols is no different on a wired or a wireless LAN, provided the network analysis software can read the packets fully. If security is enabled, the protocol analyzer must be able to act like any other node on the wireless network and decode the packet payloads using the shared keys. The ability to use WEP in the same way as all other nodes on the network must be built into the analyzer.


1 Leveraging Existing Assets with AP Capture Adapters One of the most significant issues that exists in WLAN troubleshooting today is access to packets at the source of the trouble. Overlay networks, a deployment of wireless sensors that can monitor all wireless traffic from existing APs, is an effective but very costly means of having instantaneous access to wireless packets. A far more attractive solution is to be able to capture packets using the existing wireless network - after all, the hardware is.

Guide to Wireless LAN Analysis designed to both transmi t and receive. An AP capture adapter allows existing APs to be put into a listen-only mode, and directs them to forward all of the packets they receive to an analyzer over the wired network. No additional hardware, or expense, is required to implement this solution.

Access to information for troubleshooting from any location on the network is only a few clicks away.. 2.4 Conclusion The demand for wireless networks is strong and increasing. The technology continues to evolve rapidly. Improvements in throughput, reliability, security, and system interoperability consistently add to this demand.

Both the security of the new WLANs and their performance depend on active, informed network management. Effective network management requires the right tools..

Appendix: Wireless Terms Access Point Ad Hoc Netw ork Base Station BSS (Basic Service Set) Cell CSMA/CA CSMA/CD CTS DHCP DS (Distribution System) DSSS ESS (Extended Service Set) Frame FHSS IBSS IEEE Infrastructure LLC MAC NIC OFDM Roaming RF RTS WEP WFA WLAN Provides connectivity between wireless and wired networks Peer-to-Peer network of roaming units not connected to a wired network Access Point Wireless network utilizing only one access point to connect to a wired network The area within range of and serviced by a particular base station or access point Carrier Sense Multiple Access with Collision Avoidance Carrier Sense Multiple Access with Collision Detection Clear To Send Dynamic Host Configuration Protocol, used to dynamically assign IP addresses to devices as they come online Multiple access points and the wired network connecting them Direct Sequence Spread Spectrum A wireless network utilizing more than one access point A packet of network data, framed by the header and end delimiter Frequency Hopping Spread Spectrum Independent Basic Service Set or Ad Hoc Network The Institute of Electrical and Electronics Engineers Wireless network topology utilizing access points to connect to a wired network Logical Link Control Media Access Control Network Interface Card Orthogonal Frequency Division Multiplexing Traveling from the range of one access point to another Radio Frequency Request To Send Wired Equivalent Privacy Wi-Fi Alliance, an industry organization specializing in interoperability and promotion of 802.11 WLAN equipment Wireless Local Area Network.
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