The Synopsis is misleading. Net::Pcap only exports some constants by default, no functions. Try 

use Net::Pcap qw( :functions );

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In reply to Re: "Undefined subroutine &main::pcap_lookupdev called" yet module installed and PERL5LIB is set correctly : *( by ikegami
in thread "Undefined subroutine &main::pcap_lookupdev called" yet module installed and PERL5LIB is set correctly : *( by stevehicks

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