2002 Peugeot 206 gearbox knocks turning, quite silent going straight or turning freewheeling

Cant help you there , never known of , or heard of a gearbox knocking and no idea what this means " while turning I've got strokes."

I mean that just turning I've got strong noises and no traction.
I add that as the problem got worst more I could feel on steering wheel too.
Rear gear still works.
Thanks

Check engine / transmission mounts and driveshaft c/v joints

Rubber caps ( sorry, I don't know English name, I hope you can understand) are intact, so it seems we can exclude c/v joints.
Looking at partial assemblies drawings ( spare parts assemblies) and what I've felt driving the car I'm quite sure that something on driveshafts axle is broken, inside box, and lets shift gears.
Any idea?
Thanks for the effort to understand my English.