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Chapter 13 Firewall
ADSL Series User’s Guide
187
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 DESCRIPTION
LAN-to-WAN
Services Blocking
Select Enable to activate service 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.
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.
Blocked 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
Select TCP, UDP or TCP and UDP, based on which one the custom port uses.
Port Number 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.
Add
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.