User's Manual Part 2

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1. Start/End Port: Specify a range of ports between 1~65535 (for
a single port, enter the port number in both Start and End fields,
say, 21 for FTP). Contact corresponding service provider if you
don't know the port number of the service to use.
2. LAN IP: Specify the internal host’s IP address. Be sure to
statically assign the host’s IP address to make this function
constant.