I don't see anyone using the ternary operator...

$targ       = defined $opt_targ       ? $opt_targ       : 'localhost';
$firstport  = defined $opt_firstport  ? $opt_firstport  : 1; 
$lastport   = defined $opt_lastport   ? $opt_lastport   : 1024;
$proto      = defined $opt_proto      ? $opt_proto      : 'tcp';
$udptimeout = defined $opt_udptimeout ? $opt_udptimeout : 3;
$contimeout = defined $opt_contimeout ? $opt_contimeout : 3;
Usage('<lurch>You rang?</lurch>'), exit if defined $opt_help;
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And it still works with valid zero values.

Russ