D-Link DNS-321 User Manual page 30

Section 3 - Configuration
FTP Access List: List all defined FTP Rules.
Here you can Start or Stop the FTP Server.
FTP Server Status:
If you are behind a router, you will need to forward the
FTP port from the router to the DNS-321. Additional
filtering and firewall settings may need to be modified
on your router to allow FTP Access to the DNS-321
from the Internet. Once the port has been forwarded
on the router, users from the internet will access
the FTP server through the WAN IP address of the
router.
(Please see the Knowledge Section for the setup
procedure)
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