You need to be neither a "software" nor a "networking" major to read the Net::Pcap and Net::PcapUtils documentation, and to try out which of these (four) elements to pass as the device identifier to Net::Pcap. My guess is that you will need to pass the \\Device\... as the identifierr.

Perl packages bear no hierarchy except coincidential hierarchy. Net::Pcap does not include Net::Pcap::FindDevice, as you can find by following the links I gave you.