D-Link DFL-2500 User Guide - Page 170
Translate the Destination IP Address
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18.2. FTP 151 2. Services Objects → Services → Add → TCP/UDP Service: General: Enter the following: Name: ftp-inbound Type: select TCP from the dropdown list. Destination: 21 (the port the ftp server resides on). Application Layer Gateway: ALG: select "ftp-inbound" that has been created. Then click OK. 3. Rules - Allow connections to the public IP on port 21 and forward that to the internal FTP server: Rules → IP Rules → Add → IP Rule: General: Name: SAT-ftp-inbound Action: SAT Service: ftp-inbound Address Filter: Source Destination Interface: any core Network: all-nets ip-ext (assume the external interface has been defined as "ip-ext") SAT: Check Translate the Destination IP Address To: New IP Address: ftp-internal. (Assume this internal IP address of FTP server has been defined in the Address Book object.) New Port: 21. Then click OK. D-Link Firewalls User's Guide