Specifying ports for passive FTP
Normally when you connect to a FTP server through passive mode, the server will randomly select a port to use. You can specify a more finite range for the server to use if you like in either vsftpd or proftpd. Here’s how:
vsftpd:
pasv_min_port=22800
pasv_max_port=23000
proftpd:
PassivePorts 22800 23000
The reason you would want to do this would be to open up your firewall for a limited range of ports:
iptables -A INPUT -m state –state NEW -m tcp -p tcp –dport 22800:23000 -j ACCEPT
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