First, is ftp a daemon or running from xineted.
cd /etc/xinetd.d
type ls and see if there is a file for some ftp package.
If you are using an older version of linux, instead of xinetd.d you will have plain inetd. That is a single file called /etc/inetd.conf and there will be an entry for ftp.
If you are running it as a daemon, then most likey it is not in the run levels to turn it on at boot.
Turning it on depends on your linux distro.