The Services Screen - ZyXEL Communications P-2812HNU-51c User Manual

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
LAN-to-WAN
Services Blocking
Available Services
Blocked Services
Type
Port Number
Add
Delete
Clear All
P-2812HNU(L)-Fx Series User's Guide
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.
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.
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.
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.
Chapter 12 Firewall
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