Site to site FXPing problem

[Waazaap]

Thanks for helping me out dudes, I'm just an FXP n00b lol.
Just the last few questions:

NT -> UNIX and vice versa, both sites must be FXPable or do they both always have to be FXPable in order to FXP?
Because I have read multiple times that just 1 has to be FXPable in order to FXP..

And what do I need to do with the advanced options like "uploading" and "downloading"?

Thanks for helping me out!