Hello PerlMonks!

I am trying to construct a FIN packet in perl. Since i am not fimiliar with Net::RawIP i am unable to do that. Sending SYN with Net::RAWIP

use Net::RawIP
($src,$dst,$port) = @ARGV;
   $a = new Net::RawIP;
$a->set({ip => {saddr => $src,daddr => $dst},tcp => {source => $src_po
+rt,dest => $port, syn => 1}});
      $a->send;
[download]

How can i send a straight-forward FIN request without the need of starting a new 3-way-handshake?