3.18.2 Note
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If there is no definition file, Internet protocol version selection is invalid. In this case, the default settings on both the FTP server and FTP client are IPv4=ON and IPv6=OFF.
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If IPv4=OFF and IPv6=OFF are defined on the FTP server, it is considered that there is no definition. In this case, IPv4=ON and IPv6=OFF are assumed.
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If IPv4=OFF and IPv6=OFF are defined on the FTP client, it is considered that there is no definition. In this case, IPv4=ON and IPv6=OFF are assumed.