ZyXEL P-2812HNU-F1 User Guide - Page 201

Chapter 12 Firewall 12.3 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 90 Security > Firewall > Services Each field is described in the following table. Table 52 Security > Firewall > Services LABEL DESCRIPTION LAN-to-WAN Select Enable to activate service blocking. Services Blocking Available Services 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 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 359 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. Type Port Number Add 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 6345-6349. 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. Delete Clear All Select a service in the Blocked Services, and click this to remove the service from the list. Click this to remove all the services in the Blocked Services list. P-2812HNU(L)-Fx Series User's Guide 201