Here you configure a few of the networking related options for WU-FTPD.
TCP window sizes - This option configures the window size of TCP packets for the data connection. This may be useful if clients are PPP dialup users, as a smaller TCP window can provide faster transfers. Usually this does not need to be modified. This option correlates to the tcpwindow directive.
Addresses for PASV connections - Allows control of the address reported in response to a PASV command. This does not alter the address that the daemon listens on, only the address it reports to clients on a passive connection. This option configures the passive address directive.
Ports for PASV connections - Configures the port numbers which may be used for passive data connections. You may select port ranges for specific networks. When a control connection matches the network specified, a randomly selected port from the range provided will be used for the daemon to listen on. This feature allows firewalls that limit open ports to be used, while still provided FTP services. passive ports directive.