Multiple Firewalls in Handbook

[Cristian KLEIN]

Hello everybody,

After gaining some experience with using IPFW and PF, I chose to resume writing
the chapter on how to use multiple firewalls. Would someone please be so kind
and review it.

The compiled HTML can be found at
http://www.c7obs.net/~cristi/doc/en_US.ISO8859-1/books/handbook/firewalls-multi.html

If there are not big objections, I would like to file a PR with it.

Please CC me as I am not on the list.

Thanks.