HOW TO CONNECT FTP BY COMMAND LINE

#root@host# ftp
ftp> open
(to) <ip>
220 (vsFTPd 2.x.x)
Name (ip:root): <put the user that you want connect the ftp>
331 Please specify the password.
Password: <insert password where>
230 Login successful.
Remote system type is UNIX.
Using binary mode to transfer files.
ftp> ls
500 Illegal PORT command.
ftp: bind: Address to transfer files;
ftp> passive <<< put this command to start the next command's
Passive mode on. << will appear this message to continue wit sucessfuly
ftp> ls
<<will list the folders in ftp>>>