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There are two fields to each entry in the ftpservers file:
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address directory-containing-configuration-files
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For example:
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10.196.145.10 /etc/ftpd/virtual-ftpd/10.196.145.10
10.196.145.200 /etc/ftpd//virtual-ftpd/10.196.145.200
some.domain INTERNAL
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When an FTP client connects to the FTP Server, in.ftpd(1M) tries to match the IP address to which the FTP client connected with one found in the ftpservers file.
The address can be an IPv4 or IPv6 address, or a hostname.
If a match is found, The FTP server uses any configuration files found in the associated directory.
If a match is not found, or an invalid directory path is encountered, the default paths to the configuration files are used. The use of INTERNAL in the example above fails the check for a specific directory, and the master configuration files will be used.
Either the actual IP address or a specific hostname can be used to specify the virtual host. It is better to specify the actual IP of the virtual host, as it reduces the need for a domain lookup and eliminates DNS security related naming issues, for example:
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10.196.145.20 /etc/ftpd/config/faqs.org/
ftp.some.domain /etc/ftpd/config/faqs.org/
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Lines that begin with a # sign are treated as comment lines and are ignored.
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