updates... pieces flying in loose format.

[Francis Dupont]

I noted the internal network has still IPv4 addresses: it won't work
with the demo setup (cf shownet.png).

For the script as we can do what we want I proposed to use 2 options
for the port range so all values are scalars (vs. array or record).

Regards

Francis Dupont <fdupont at isc.org>