Network Security and Firewalls

Network Security and Firewalls

After establishing your host and site security policies, you may want to connect your site to external networks such as the Internet. This section is concerned with establishing such a connection with an "untrusted" network in which you do not control security. This requires special consideration of the interface between your internal, trusted network and the external network. This interface, if you take steps to provide for security, is called a "firewall" and is the subject of this section. The remainder of the discussion refers specifically to connecting to the Internet, but you can also apply it to connecting to any untrusted network.

What is the Internet?
Network Security Issues
What Is a Firewall?
Firewall Design Philosophy
World Wide Web Issues