D-Link DFL-1600 User Manual page 174

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2. Services
Objects Services
General:
Enter the following:
Name: ftp-outbound
Type: select TCP from the dropdown list.
Destination: 21 (the port the ftp server resides on).
Application Layer Gateway
ALG: select "ftp-outbound" that has been created.
Then click OK.
3. Rules (Using Public IPs)
The following rule need to be added to the IP rules in the firewall if the
firewall is using public IP's; make sure there is not rules disallowing or
allowing the same kind of ports/traffic before these rules.
in use is the "ftp-outbound", which should be using the ALG definition
"ftp-outbound" as described earlier.
– Allow connections to ftp-servers on the outside:
Rules IP Rules
General:
Name: Allow-ftp-outbound
Action: Allow
Service: ftp-outbound
Address Filter:
Source
Interface: lan
Network: lannet
Then click OK.
Chapter 18. Application Layer Gateway (ALG)
Add
Add IP Rule:
Destination
wan
all-nets
D-Link Firewalls User's Guide
TCP/UDP Service:
The service