I opened issue at authors github page here https://github.com/briandfoy/net-mac-vendor/issues/8 And also tried many other test, with perlbrew and different perl and cpan versions, to test if there isnt some incompatibility issue... But no luck. Still no output from fetch_oui_from_cache

Is there any way to test, if load_cache function works? If it really loads the cache from file? Thanks for help.