WiiFTPD by Dominic Houghton (StereoRocker) is a multi-threaded FTP daemon written for the Wii. WiiFTPD uses standard port 21 for the control connection. Passive mode uses ports 30 and above for incoming data connections. The package that WiiFTPD is shipped in comes with a folder ready to put into your /apps/ directory for Homebrew Channel, ready to be used immediately.

http://wiibrew.org/wiki/WiiFTPD