When Web services are offered outside the firewall, HTTP traffic (and HTTPS traffic) should be blocked from the internal networks via the use of some form of proxy access or DMZ architecture. With a Web server in the DMZ you simply allow HTTP to access the Web server, and use rule set 8, the cleanup rule (which will be described shortly), to prevent any other access. In order to keep the Web server inside the internal network, direct all HTTP requests to the proxy server and configure the internal filtering router/firewall only to allow the proxy server to access the internal Web server. The rule shown in Table 6-12 illustrates the first example. This rule accomplishes two things: it allows HTTP traffic to reach the Web server, and it prevents non-HTTP traffic from reaching the Web server. It does the latter via the cleanup