2. Cricket and SNMP Using Cricket to manage SNMP objects

3. Systems and Network ManagementSNMP2 Cricket: what is it Can monitor almost anything in a computer network Can use SNMP, scripts, WMI on Windows, programs, files,… as sources of data Can also send traps, or set alarms Keeps data in fixed sized “round-robin database” Data kept over last day, week, month, year Data visible in graphs through a web interface Very useful in detecting trends, knowing when something is wrong, or “different from usual” Graphs very easy to understand Can be installed on Linux, Unix, Windows.

4. Systems and Network ManagementSNMP3 Documentation for Cricket Cricket documentation (plenty!) is at http://cricket.sourceforge.net/support/doc/ http://cricket.sourceforge.net/support/doc/ Today we look at: http://cricket.sourceforge.net/support/doc/neta- paper/paper.htmlhttp://cricket.sourceforge.net/support/doc/neta- paper/paper.html http://cricket.sourceforge.net/support/doc/intro. htmlhttp://cricket.sourceforge.net/support/doc/intro. html http://cricket.sourceforge.net/support/doc/new- devices.htmlhttp://cricket.sourceforge.net/support/doc/new- devices.html Good, helpful, active mailing list

5. Systems and Network ManagementSNMP4 When should I use Cricket? Great if your boss expects you to monitor the company network, but no budget for huge NMS Great if you also have a huge NMS and big budget –The graphs are easy to set up –the view over the long and short term is better than what many big NMS systems provide

6. Systems and Network ManagementSNMP5 Cricket’s “Config Tree” Many programs have a single configuration file, or one directory with some configuration files Cricket has a directory tree of configuration files Called a Config Tree As we set up in the lab: –~cricket/cricket-config Each directory in cricket-config contains a file called Defaults

7. Systems and Network ManagementSNMP6 Config Tree Defaults file holds settings for all directories below –Unless they override these settings with their own settings in another file. When Cricket processes a directory, –Processes Defaults file first (if present) –Processes all other ordinary files next’ –Finally processes each of subdirectories Other files apply changes to current directory settings only Defaults file applies to all subdirectories too

8. Systems and Network ManagementSNMP7 Tags and values Look at the Top level Defaults fileve you (at ictlab:/var/ftp/snmp/servers) You will see: snmp-community = public snmp-port = 161 snmp = %snmp-community%@%snmp- host%:%snmp-port%:%snmp-timeout%:%snmp- retries%:%snmp-backoff%:%snmp-version%

9. Systems and Network ManagementSNMP8 Tags and values 2 Look at the servers files that I gave you (at ictlab:/var/ftp/snmp/servers) You will see: server = %auto-target-name% snmp-host = %server%