ZyXEL P-660HNU-F1 User Guide - Page 187
The Services Screen
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Chapter 13 Firewall 13.3 The Services Screen Use this screen to enable service blocking and to maintain the list of services you want to block. To access this screen, click Security > Firewall > Services. Note: These rules specify which computers on the LAN can access which computers or services on the WAN. Figure 93 Security > Firewall > Services Each field is described in the following table. Table 54 Security > Firewall > Services LABEL LAN-to-WAN Services Blocking Available Services DESCRIPTION Select Enable to activate service blocking. This is a list of pre-defined services (destination ports) you may prohibit your LAN computers from using. Select the port you want to block, and click Add to add the port to the Blocked Services field. Blocked Services Type Port Number Add A custom port is a service that is not available in the pre-defined Available Services list. You must define it using the Type and Port Number fields. See Appendix E on page 331 for some examples of services. This is a list of services (ports) that are inaccessible to computers on your LAN when service blocking is effective. To remove a service from this list, select the service, and click Delete. Select TCP, UDP or TCP and UDP, based on which one the custom port uses. Enter the range of port numbers that defines the service. For example, suppose you want to define the Gnutella service. Select TCP type and enter a port range of 63456349. Click this to add the selected service in Available Services to the Blocked Services list. Note that the service is blocked immediately after clicking this. ADSL Series User's Guide 187