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Network Hosts Analyzer

Network Hosts Analyzer. Hadas Shumovitch shumoviz@t2 Elad Levi seladlvy@t2 Tal Katz sdew@t2. Presentation Layout. Background Program outline Cache refresh algorithm User Interface Points for Extension. Background.

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Network Hosts Analyzer

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  1. Network HostsAnalyzer Hadas Shumovitch shumoviz@t2 Elad Levi seladlvy@t2 Tal Katz sdew@t2

  2. Presentation Layout • Background • Program outline • Cache refresh algorithm • User Interface • Points for Extension

  3. Background • The Computer Science faculty has hundreds of computers and users. • There is a need for a program to monitor and supervise all of the computers. • There are programs available, but they are very expensive.

  4. Background - continued • Our goal is to design a scalable, configurable monitoring system which answers the faculty needs and is easy to use.

  5. Program outline • The program handles two threads. • One thread is responsible for interaction with the user, while the other is responsible for updating the system’s cache.

  6. Program outline • In order to reduce the amount of communication through the faculty network, and reduce the program response time, we’ll maintain a cache. • The cache keeps the information about the faculty computers and floors switches. • The updating frequency of the cache is defined by the user. • Information requests from the user are answered by retrieving the information from the cache, except for “who is logged in right now”.

  7. Cache refresh algorithm • Cache updating frequency can be changed by the user to any whole number of minutes. The program is loaded with a default updating frequency of one hour. • In addition, it is possible to perform immediate cache refresh.

  8. for (every floor) { get floor’s router ARP table; for (every switch in the floor) { get switch's data; for (every MAC address connected to the switch) { convert MAC -> IP address; get end station local data; // UDP connection update the relevant entry in the cache; } } } Cache refresh algorithm

  9. Example • Router Switch End Stations • Floor 7: • Floor 3:

  10. Algorithms – Additional communication modules A telnet API: • The routers and switches in the faculty run Command Line Interface (CLI), through which we get their inner information. • In order to connect to the routers and switches we have implemented a Telnet API. • The implementation is especially suitable for the kind of routers and switches in the faculty.

  11. Algorithms – Additional communication modules End Station Agent: • Every end station in the faculty, including Laptops, should run an agent. • When the agent starts to run, it reads from a configuration file the computer’s data. • The agent will listen for data requests on a pre defined port which is known by the analyzer main system.

  12. Algorithms – Additional communication modules End Station Agent - continued: • The agent is single threaded. • We have implemented two versions of the agent. One for Unix, and one for Windows 2000 and up.

  13. User Interface No GUI mode:

  14. GUI mode Main Menu:

  15. User Interface Switches Menu:

  16. User Interface Ports Menu:

  17. User Interface End Stations Menu:

  18. User Interface End Station:

  19. Points for Extension • Working from two different computers. • End station agent informing on inner problems.

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