Léo Le Bouter via Bug reports for GNU Guix 写道：
Should we explicitly check if we are over an IPv6 connection instead?Is that possible?
My FTP knowledge is about two decades out of date: does an IPv6 server (de facto) have to support EPSV?
The ‘right’ way would be to send the FEAT command, and check whether the server actually supports EPSV. A bit more heavy-weight than your heuristic.
Kind regards, T G-R
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