Linux Administration: A Beginners Guide, Sixth Edition, 6th Edition

CHAPTER 13

Linux Firewall (Netfilter)

In what feels like a long, long time ago, the Internet was a pretty friendly place. The few users of the network were focused on research and thus had better things to do than waste their time poking at other people’s infrastructure. To the extent security was in place, it was largely to keep practical jokers from doing silly things. Many administrators made no serious effort to secure their systems, often ...