A case study in connecting a small business to the Internet
This chapter covers three items many small companies face—how to connect to the Internet with minimal cost, how to allow everyone in the company to use it, and how to protect it from crackers.
Firewalls are mainly designed to prevent unwanted activity on a network, so their basic function is to block connections from one network to another. In most applications, this would be from the Internet to your local network, and vice versa.
There are thousands of different firewall methodologies, but we will narrow our discussion in this chapter to
ipfwadm. Let's assume that the local network is Ethernet with less than 254 machines, and connections to ...