Which personal firewalls would you recommend to our readers?
I'd rather not make any product recommendations. We wrote about how to use several of them in the book. The PC versions have functionality that is quite different from the Unix versions. Again, I suggest making the decision on the factors mentioned in my previous answer.
What are your future plans? Any exciting new projects?
Right now, I'm trying to settle into my new job. I just left industry for academia less than two months ago. Academia appears to be a much busier lifestyle, and I'm just starting to get my bearings. I'm really enjoying teaching, and the interaction with graduate students and other faculty is wonderful. I don't understand how professors ever have time to write books. Maybe that's what sabbaticals are for.
What is your vision for firewalls in the future?
Firewalls will move into the host, and policies will be set by loading them into distributed hosts over cryptographic channels. At least, I hope that's what happens. We'll see.