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   # Instanciate object, will start capturing from network
   my $dump = Net::Packet::Dump->new(
...
         do_stuff($frame);
      }
   }

bless(Net::Packet::netpacket_pcap_fp($self->_pcapd), 'IO::File')

FILE * netpacket_pcap_fp(pcap_t *pd){
   if (pd == NULL) return(0);
   else return(pd->sf.rfile);
}

'_pcapd' => pcap_tPtr=SCALAR(0x896dde8)
   -> 144211632

struct pcap_sf {
    FILE *rfile;
...
    struct pcap_sf sf;
    ...
};