> But I have a little probleme: I can't make a device /dev/tun0 (or N)
> with ./MAKEDEV tun0 in /dev like it's said in the ppp man pages.
Well, the man pages are BSD centric. In the Hurd, pfinet will
automatically create the tunnel device for you. Just run
settrans -acpfg /servers/socket/2 /hurd/pfinet -i tun0
and then take a look in /dev.