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While many networking problems can be solved quickly with decodes and statistics, many of the more difficult problems cannot be solved in a nonintrusive manner In this case it is necessary to communicate actively with the network devices in order to recreate the problem or obtain necessary information to further isolate a problem The user can actively query or stress the network and observe the results with decodes and statistics Observing Ethernet frames with the same IP address and different MAC addresses might indicate a duplicate IP address problem, for example, but it also might just be the result of a complex router topology To determine the node s identity router or true duplicate IP address the user can search through thousands of captured frames with decodes But by sending an Address Resolution Protocol (ARP) frame to the node on the network and comparing the results to the addresses of the routers on the network, determined with Node Discovery statistics measurements, the user can quickly isolated duplicate IP addresses Typical active tests include:
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Connectivity tests Installation tests Network path analysis Adapter status commands Address resolution tests MIB (Management Information Base) queries
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In the context of protocol analysis, simulation can take two forms: protocol simulation and protocol emulation Protocol simulation Protocol simulation allows the user to send strings of data containing selected protocol headers along with the encapsulated data In this way, the operation of a network device can be simulated for the purpose of testing a suspected problem or for establishing a link to confirm operation Protocol emulation Protocol emulators are software programs that control the operation of the protocol analyzer automatically In the case of X25, for examDownloaded from Digital Engineering Library @ McGraw-Hill (wwwdigitalengineeringlibrarycom) Copyright 2004 The McGraw-Hill Companies All rights reserved Any use is subject to the Terms of Use as given at the website
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ple, a protocol emulator takes over the functions of bringing up the link at layers one, two, and three and then automatically maintaining the connection These functions are specified by the user, and the operation is then placed under programmatic control Typically simulation tests are executed on top of an emulation program that is automatically handling the lower layers of the protocol stack, eg, emulating a frame relay circuit while simulating a ping
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Protocol analyzers offer a wide range of capabilities in programming Analyzers intended for field service applications often have simple, soft-key-assisted programming languages to control the instrument functions that monitor and simulate network traffic Those intended for use in development have fully compiled or interpreted language implementations for custom test script generation The commands in the programming language will give the user access to the full set of functions described in section 247 In addition to script generation, programming languages are useful for analyzing acquired data, searching for complicated combinations of events, decoding special protocols, and customizing the data format Programming languages usually are communications-enhanced versions of standard programming languages such as C or Visual Basic They provide the ability to create, modify, debug, and execute user programs Libraries are provided to implement common networking functions such as calculating an FCS or assembling and transmitting a frame The programming language environment interfaces to the measurements and analysis capability of the rest of the product 247 Protocol Analysis Options Protocol analysis consists of using measurements like those described in the preceding section to isolate network problems or monitor network performance The protocol analysis options described in this section are a set of orthogonal capabilities to the measurements described previously For example, a protocol analyzer can gather statistics on the network traffic, but a more effective troubleshooting approach is created by setting a capture filter and running the statistics so only the data between a file server and a router is analyzed
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