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Forum Discussion
FTP server using passive ports
Hello everybody. This is more of a network-question than a readynas one. I've just recently bought an Ultra 4 in an addition to my Duo. I've had, and still have the FTP service running at the Du...
The ultra is using 14199, and the duo is using 14179. That is computed using 55*256+99.
Slasky wrote:
pugilares wrote: I'm using FileZilla and numbers popping up after the IP-address are 55 and 119 on the Ultra, and 55 and 99 on the Duo
You should be forwarding 14170-14180 to the Duo.
BTW, passive mode was invented to allow connectivity when the client is behind a nat. Active mode works fine when only the server is behind a nat. But in active mode, the server opens the data connection to the client (using a port the client chooses). This fails if the client is behind a firewall/nat which blocks incoming connections.
Passive mode has the client open both the data connection and the control connection to the server. This is outbound traffic to the client's firewall, so it is permitted. But the passive connection can only reach the server if the server's NAT/Firewall opens the passive port.
There is a more detailed explanation here: http://slacksite.com/other/ftp.html
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