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This script polls network switch ports to see which MAC addresses are assigned to them, then polls the arp table
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on one or more routers to determine the IP address. It then uses reverse DNS to look up the name of the device
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The results are saved in a YAML file and used to initialize the internal structures if it exists, so when a device
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goes off the network, the information that it was there remains available (and the date/time it was last seen).
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Since the data is stored in a YAML file, a second script, mapSwitchesShow.pl was created to convert to a tab delimited text
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file for human viewing and/or script processing.
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Files:
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mapSwitches.pl - the main file which connects to each device in config, gathers data, and updates persistent storage
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mapSwitchesShow.pl - converts stored data into a CSV (tab delimited)
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mapswitches.cron - sample cron file to gather information hourly and generate a CSV once a day
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The following files are not required for the system to run
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mapSwitches.config.yaml.sample - sample configuration file
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README - This file
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makeConfig.pl.sample - generate configuration file from hash. Easier for perl programmers
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mapSwitches.config.yaml.sample - sample configuration file
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pingall.pl - utility to ping all available ports on a /24 network. Used to artificially refresh arp table
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The configuration file MUST be created before running the script. It can be manually created
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(rename mapSwitches.config.yaml.sample to mapSwitches.config.yaml and edit) or generated makeConfig.pl.sample
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(edit hash, then run)
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The following file is created on first run.
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mapSwitches.yaml
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This is the persistent storage. It can be safely deleted at any time to reinitialize the system.
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The script requires snmp to be installed (no MIB files required), and uses the perl module YAML::Tiny. On a Debian based
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system, this can be installed with the command:
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apt-get libyaml-tiny-perl snmp
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We generally set this to be run hourly, and we then generate a tab delimited text file once a day. See the sample cron file
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for how we do it.
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