The only thing I've ever seen in it was a modification of FTP to use SCTP streams on a single connection rather than have two connections. This would of course

The only thing I've ever seen in it was a modification of FTP to use SCTP streams on a single connection rather than have two connections. This would of course make the whole active-FTP-over-NAT business easier, except for the fact that the average NAT device ($50 home router) probably doesn't play nicely with SCTP. Given the subject matter, I should probably include my usual disclaimer string: I work as a software engineer for F5 Networks. Anything I post here is my own thought and is not intended to represent F5.