I have configured two machines through ipsec-tools and fedora linux kernel to make them communicating by using IPv6 and IPsec.

For testing, I have tried to send packets through ping6 and FTP (vsftpd-1.1.3-8 ) and analysed the packets through ethereal.
When I use ping6, IPv6 is used for communication and packet is also encrypted as it is using ESP.

When I send a file through FTP, it uses IPv4 rather than IPv6.

Any suggestions or comments that why it is not using IPv6 during file transfer through FTP


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