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Aha! No Firewall — Very, Very Good
Broadband connections give you a quantum leap in speed and convenience when you’re connecting to the Internet. The two most popular choices for a broadband connection are DSL and cable modems. After you start using them, you may never go back to slow, Stone Age telephone-based modems.But every silver lining implies a dark cloud. Broadband connections give you not only fast Internet connections but also continuous ones. With a telephone-based modem, a hacker can attack only your home computer and private network while you’re connected to the Internet. Using a 24/7 broadband connection means that every hacker on the Internet — that means every hacker in the world — can constantly bang on your computer and private network. That’s lots of vulnerability.Firewalls provide your number-one protection from Internet-based attacks. The modern Netfilter/Iptables packet-filtering firewall system gives you excellent protection when it’s properly configured. The Red Hat installation process installs a good Iptables-based firewall by default, and Chapter 8 describes how to configure an even better one. You should never, ever connect to the Internet without first configuring your personal firewall.TipWe don’t mean to imply that you’re invulnerable to attack if you use a telephone-based modem to connect to the Internet. Traditional modem connections are just as vulnerable as continuous broadband connections when they’re active. What we mean is that an unconnected modem is a safe modem.
