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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.
 Firewalls examine port, source and destination
Firewalls examine port, source and destination information.
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CertiGuide for Network+ (http://www.CertiGuide.com/netplus/) on CertiGuide.com
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