Hello, Kimmo.
You wrote 15 апреля 2013 г., 14:47:24:

KP> I'm however talking about an ftp client behind a very restrictive
KP> firewall making an IPv6 connection an ftp server that uses passive
KP> mode data ports that can't be known in advance.
  Same solution -- inspection of connections to 21 port, without any
 address translation. And if FTP server uses non-standard control
 port, yes, here is a problem, but it cannot be solved with NAT too
 (or your NAT/firewall should expect each and every connection for FTP
 commands, which is heavy and error-prone task).

-- 
// Black Lion AKA Lev Serebryakov <l...@freebsd.org>

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