Network Management in C#.NET

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Network Management
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The network-layer matrix table permits tracking the number of packets sent between pairs of hosts by network-layer address The application-layer host table permits tracking bytes, packets, and errors by host according to the application The application-layer matrix table permits tracking conversations between pairs of hosts by application The history group permits filtering and storing statistics according to user-defined parameters and time intervals The configuration group defines standard configuration parameters for probes that include such parameters as network address, serial line information, and SNMP trap destination information
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RMON II is focused more on helping network managers understand traffic flow for the purpose of capacity planning rather than for the purpose of physical troubleshooting However, the capability to identify traffic levels and generate statistics by application has the potential to greatly reduce the time it takes to troubleshoot certain problems Without tools that can pinpoint which software application is responsible for gobbling up a disproportionate share of the available bandwidth, network managers can only guess Often it is easier just to upgrade a server or a buy more bandwidth, which inflates operating costs and shrinks IT budgets
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Being a simple application, SNMP does not have all the features of a fullblown network management system Among the many capabilities SNMP does not have are automatic discovery and topology mapping The automatic discovery capability finds and identifies all devices or nodes connected to the network Based on the discovered information, the network management system automatically populates a topology map Nodes that cannot be discovered automatically can be represented by manually adding custom or standard icons to the appropriate map views, or by using the network management systems SNMP-based APIs for building map applications without having to manually modify the configuration to accommodate non-SNMP devices A network map is useful for ascertaining the relationships of various equipment and connections, keeping an accurate inventory of network components, and isolating problems on the network The network map is updated automatically when any device is added or removed from the
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network A device status is displayed via color changes to the map Any changes to the network map are carried through to the relevant lower-layer maps Some vendors have developed graphical wrappers for SNMP, which makes SNMP easier to use than its traditional text-based CLI They have also appended additional functionality such as automatic discovery and topology mapping (see Figure 9-4), giving SNMP-based products the look and feel of a high-end network management system Many wireless devices, including both APs and bridges, support SNMP This is a standard protocol for managing a variety of systems and network devices on both wired and wireless networks A set of common management tasks can be done with SNMP, but vendors often include proprietary management features in their products that can also be handled via SNMP This enables SNMP to perform some management tasks that cannot be done using the vendor s GUI For example, it might be possible to disable SSID broadcasts from an AP using SNMP but not with the vendor s GUI configuration tool But care must be taken when using SNMP Products often ship with a default password When changing other default settings, administrators should not overlook changing the default SNMP password (often called the
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Figure 9-4 Castle Rock Computing, Inc offers SNMPc for Windows NT and Windows 2000, which, among other things, provides a graphical display that supports multilevel hierarchical mapping
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Network Management
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community) as well As an extra security precaution, administrators should consider disabling SNMP until it is actually needed If a hacker ever succeeds in exploiting the security vulnerabilities of SNMP, he or she could tie up network resources at will (discussed later)
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