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5.2 Access Control
You may want to block specific computers within the local network (or even the
whole network) from accessing certain services on the Internet. For example,
you may want to prohibit one computer from surfing the Web, another com-
puter from transferring files using FTP, and the whole network from receiving
incoming e-mail.
Access Control defines restrictions on the types of requests that may pass from
the local network out to the Internet, and thus may block traffic flowing in both
directions. In the e-mail example given above, you may prevent computers in
the local network from receiving e-mail by blocking their outgoing requests to
POP3 servers on the Internet. The Access Control feature incorporates a list of
preset services in the form of applications and common port settings, allowing
you to specifically select those that you want to restrict or grant access.
• To view and allow/restrict these services:
1. Select the Access control tab in the Security management screen. The
Access control screen will appear (see figure 5.3).
2. Click the New entry link. The Add access control rule screen will ap-
pear (see figure 5.4).
Figure 5.4: Add Access Control Rule
Figure 5.3: Access Control
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