D-Link DFL-900 User Manual page 30

Part I
Overview
Step 6. Setup IP for the FTP
Server
Assign an IP of 10.1.1.5/255.255.255.0 to
the FTP server under DMZ1. Assume the
FTP Server is at 10.1.1.5. And it is listening
to the well-known port (21).
Step 7. Setup Server Rules
Insert a virtual server rule by clicking the
Insert button.
Step 8. Customize the Rule
Customize the rule name
ftpServer. For any packets with its
destination IP address equaling to the
WAN1 IP (61.2.1.1) and destination port
equaling to 44444. DFL-1500 will translate
the packet's destination
10.1.1.5/21. Check the Passive FTP
client to maximize the compatibility of the
FTP protocol. This is useful if you want to
provide connectivity to passive FTP clients.
For passive FTP clients, the server at DMZ
will return them the private IP address
(10.1.1.5) and the port number for the
clients to connect back
transmissions. Since the FTP clients at the
WAN side cannot connect to a private-IP
(ex.10.1.1.5) through the internet. The data
connections would be fail. After enabling
this feature, the DFL-1500 will translate the
private IP/port into an IP/port of its own.
Thus the problem is gracefully solved.
D-Link
ADVANCED SETTINGS > NAT > Virtual Servers
ADVANCED SETTINGS > NAT > Virtual Servers > Insert
as the
IP/port into
for data
N/A
22