Edimax Technology AR-7211B V2 - Manual (Page 74)

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If the application you want to set up is not listed, click the User-defined
Application Name radio button and type in a name for the trigger in the
Custom application field. Configure the Start Match Port, End Match Port,
Trigger Protocol, Start Relate Port, End Relate Port, Open Protocol and Nat
type settings for the port trigger you want to configure.
Click the Apply changes button to finish the setting.
5.6.2.7. FTP ALG Port
Click FTP ALG Port in the left pane to display the following screen. The
common port for FTP connection is port 21, and a common ALG monitors the
TCP port 21 to ensure NAT pass-through of FTP. By enabling this function,
when the FTPserver connection port is not a port 21, the FTP ALG module will
be informed to monitor other TCP ports to ensure NAT pass-through of FTP.
Field Description
FTP ALG port Set an FTP ALG port.
Add Dest Ports Add a port configuration.
Delete Selected
DestPort
Delete a selected port configuration from the list.
5.6.2.8. NAT IP Mapping
NAT is short for Network Address Translation. The Network Address
Translation Settings window allows you to share one WAN IP address for
multiple computers on your LAN.Click NAT IP Mapping in the left pane, the
page shown in the following figure will appear.