Fedora configures the interfaces through /etc/sysconfig/network* (in
particular ifcfg-*), however you'd better try for now doing it by hand via
ifconfig eth0 netmask

and (if you want, for host access):
route add default gw
(which isn't in the setup supplied by Stefano) - it sets the host as default
gateway. I took the host IP assigned to tap0.

Now works.