Hmm not sure I understand then...
I understand that because of some changes in OE, the rpcinfo and showmount tools are broken. But I can't mount my NFS folder on my RPi although I can on my other machine, so my main machine apparently has a working NFS server and the only part not working in this net is the RPi with LE.
I could install another distro and see if it works there. I wanted to know if there was a known reason for it not to work, or a way to debug the problem.