Chapter 15. Firewalls
“Firewalls are barriers between ‘us’ and ‘them’ for arbitrary values of ‘them’.”
Steve Bellovin
Introduction
If you look hard enough, you can find firewalling technology in some surprising places. Firewalls have been on the market for a long time, and they have evolved to the point that you find them in myriad permutations. Most corporations and large organizations use expensive commercial firewalls that run on dedicated server software or network appliances. You can find firewall code in embedded devices, such as enterprise routers and inexpensive home networking devices. Several free firewalls are included in different operating systems, or you can buy them as part of desktop security suites. The most recent enterprise ...
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