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$dev = Net::Pcap::lookupdev(\$err)

use Net::Pcap;
use strict;
...
    die 'Unable to determine network device for monitoring - ', $err;
}

Net::Pcap::lookupnet($dev, \$net, \$mask, \$err)

my ($address, $netmask, $err);
if (Net::Pcap::lookupnet($dev, \$address, \$netmask, \$err)) {
...
}
print STDOUT "$dev: addr/mask -> $addr/$mask\n";

$object = Net::Pcap::open_live($dev, $snaplen, $promisc, $to_ms, \$err
+)

Net::Pcap::loop($object, $count, \&callback_function, $user_data)

sub callback_function {
    my ($user_data, $header, $packet) = @_;
...
    ...
}

Net::Pcap::compile($object, \$filter_compiled, $filter_string, $optimi
+se, $netmask)

Net::Pcap::setfilter($object, $filter_compiled);

Net::Pcap::close($object)

use Net::Pcap;
use NetPacket::Ethernet;
...
        $ip->{'dest_ip'}, ":", $tcp->{'dest_port'}, "\n";
}