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Date: Mon, 14 Apr 2003 20:19:46 -0700
To: freebsd-questions@freebsd.org
From: Paul Hoffman <phoffman@proper.com>
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Subject: Re: Multiple FTP servers with different characteristics on one
 server?
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To answer my own question:

inetd lets you run multiple instances, each one listening to a 
particular port, using the -a option. lukemftpd from the ports 
collection lets you give a directory for the set of ftpd 
configuration files.

So, now my rc.local file has:

/usr/sbin/inetd -wW -a 10.0.0.1 /etc/inetd-for-1.conf
/usr/sbin/inetd -wW -a 10.0.0.2 /etc/inetd-for-2.conf
. . .

/etc/inetd-for-1.conf has:
ftp stream tcp nowait root /usr/local/libexec/ftpd ftpd -d -ll -c 
/etc/ftp-for-1

and so on.