Specifications

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An example virtual server: 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.
Dest. IP− a unique, global IP address that is valid in the Internet. This will be one of the
IP addresses assigned by your ISP, or the single IP address assigned by your ISP, if
your ISP assigns you only one IP address. Use Netmask to specify a range of the dest.
IP (see the example above).
Service − TCP or UDP or Any of them. Choose a port number (range) to explicitly
indicate which application traffic to redirect.
Translated Destination IP − the IP address of the computer that will act as a server for
this application you are setting up.