man ftpd
>FILES
> /etc/ftpchroot List of normal users whose root directory should be changed via chroot(2).
> /etc/ftpd.conf Configure file conversions and other settings.
> /etc/ftpusers List of unwelcome/restricted users.
> /etc/ftpwelcome Welcome notice before login.
> /etc/motd Welcome notice after login.
> /etc/nologin If it exists, displayed and access is refused.
> /var/run/ftpd.pids-CLASS
> State file of logged-in processes for the tnftpd class `CLASS'.
> /var/run/utmp List of logged-in users on the system.
> /var/log/wtmp Login history database.
man ftpd.conf
> portrange class [min max]
> Set the range of port number which will be used for the passive data port. max must be greater than min, and both numbers must be be between IPPORT_RESERVED (1024) and 65535. If class is ``none'' or no arguments are specified, disable this.
>
> Each authenticated user is a member of a class, which is determined by ftpusers(5). class is used to determine which ftpd.conf entries apply to the user. The following special classes exist when parsing entries in ftpd.conf:
> all Matches any class.
> none Matches no class.
/etc/ftpd.conf
を作成してportrangeで指定すればよいようです。
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