TRENDnet Bluetooth R91007G - Manual (Page 43)

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If remote access is enabled, then the unit’s FTP ports can be configured. The
default FTP port is 21, and the default passive mode port range is 50000 to
50100. These can be changed for security or networking purposes. If a
BlueFlyers unit is behind a firewall, then the firewall must be configured to pass
the FTP and passive mode ports to the BlueFlyers unit. If multiple units are
behind a firewall, then each unit will need a unique FTP port and a unique
passive port range so that firewall can be configured to forward ports correctly.
The following diagram shows an example network setup. A PC with an Internet
connection is used to remotely access multiple BlueFlyers units which are
located behind a firewall. The units are configured for static IP addresses and
unique FTP and passive mode ports. The firewall’s port forwarding is configured
to pass the correct ports to known static IP addresses. The PC uses the public
Internet address of the firewall, in this example 209.114.198.3. This public
Internet IP address is assigned by the Internet Service Provider (ISP) and may
be static or dynamic depending on the service. The unique FTP port number
11021 is used to specify which unit is to be accessed. The firewall then
connects the PC to the correct BlueFlyers unit based on this port number.