Hi there! I need to map a external port to an different internal port number. This is the situation: My ISP does not allow incoming connection on Port 21. I have got a new NAS which also has a FTP Server on Port 21 and you cant change the Port number. So if I input ftp://www.myftp.dyndns.org:1234 the following rule should exist: incoming data @ Port 1234 -> 192.168.1.103 @ Port 21 In the Webinterface a can only apply the rule if both ports are the same. In my internal network I am able to connect to the ftp server (21) but from outside it is not working because of my ISP Thx in advance!