[CTX] [ALL]
bounce:{no|do|th|cb|rl}
-- default: FTPCONF=bounce:no
controls how to manipulate FTP Bounce.
no -- reject any FTP Bounce
do -- permit any FTP Bounce
th -- don't care FTP Bounce (backward compatible)
cb -- convert FTP Bounce to "EPRT |||port|"
rl -- reject FTP Bounce from specific clients in combination with REJECT="ftp-bounce:*:clientHost" parameter