Proxy Servers and Firewalls
The technical layout of a proxy server makes adding a firewall a relatively easy programming effort to a proxy server. As we discussed in the TCP/IP chapter, an IP Proxy server consists of a system with two or more network interfaces, which accepts traffic from the Internet on one external interface, and traffic from inside the company on one or more internal interfaces.
This is just the sort of setup one needs to provide a security firewall for a network, with packets not being let into, or out of, a network unless they meet certain rules. Firewalls can be easy to setup, or can become quite complex in operation based on needs. It is also not unusual to find a firewall in a router.
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