FTP uses TCP on port 21 for sending commands, and UDP for returning data. So justing opening 21 will not allow you to transfer files or see dir.
You need a stateful firewall, like Linksys. I have one and it works fine. Not sure about Dlink.
Or you can place the ftp server in the DMZ if you feel lucky.
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You need a stateful firewall, like Linksys. I have one and it works fine. Not sure about Dlink.
Or you can place the ftp server in the DMZ if you feel lucky.