D-Link DFL-900 User Manual page 15

Quick Start
Step 7 ¡ Ð Setup Server Rules
Insert a virtual server rule by clicking the Insert
button.
Step 8 ¡ Ð Customize the Rule
Customize the rule name as the ftpServer. For
any packets with its destination IP equaling to the
WAN1 IP (61.2.1.1) and destination port
equaling to 44444, ask DFL-900 to translate the
packet's destination IP/port into 10.1.1.5/21.
Check the Passive FTP at this port 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 will return them the private IP address and
the port number for them to connect back to do
data transmissions. Since the private IP from
them cannot be routed to our zone, the data
connections would fail. After enabling this feature,
the DFL-900 will translate the private IP/port into
an IP/port of its own. Thus the problem is
gracefully solved. Click Apply to proceed.
Step 9 ¡ Ð View the Result
Now any request towards the DFL-900's WAN1
IP (61.2.1.1) with dest. port 44444 will be
translated into a request towards 10.1.1.5 with
port 21, and then be forwarded to the 10.1.1.5.
The FTP server listening at port 21 in 10.1.1.5
will pick up the request.
ADVANCED SETTINGS > NAT > Virtual Servers
ADVANCED SETTINGS > NAT > Virtual Servers > Insert
ADVANCED SETTINGS > NAT > Virtual Servers
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DFL-900 User Manual