https://github.com/DokimiCU/mg_tectonic
Edit: Source: https://en.wikipedia.org/wiki/File_eXchange_Protocol#Technic...
1. You connect to servers A and B.
2. Tell B to receive a PASV transfer. It replies with the IP address and port it's receiving on.
3. Tell A to send to that address and port.
This is documented in RFC 959, starting with
"In another situation a user might wish to transfer files between two hosts, neither of which is a local host."
https://gkanold.wixsite.com/homeputerium/copy-of-games-list-...