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Securing Your Device 23
Allowed Applications
Click or touch applications you wish to give access to the internet
while the Port Filtering feature is enabled. All other applications
will be blocked.
Note: DNS (Domain Name Server)
should always be enabled when using Port
Filtering. Without DNS, it is not possible to convert a Domain name (for
example, www.msn.com) to an IP address. DNS is used by E-mail, FTP,
and many other protocols as well as by Web browsers.
Custom Applications
Define your own
Allowed Applications
. Define and enable
additional applications.
•
Application Name
: Enter a name for the application you are defining.
•
Port Range
: Define the ports used by the application. These ports refer
to outgoing traffic.
–
For a single port, enter the port number in both the Start Port and End
Port fields.
–
For a port range, enter the beginning of the range in the Start Port field
and the end of the range in the End Port field.
–
Up to 5 ports or port ranges can be defined. Use as many rows as
necessary; unused rows can be left blank.
•
Port Type
: For each port range (each row), select the protocol (TCP,
UDP, or both) used by that port range.
Buttons
•
Apply
: When this button is clicked, all settings (enabled, name, port
settings) for all applications are saved to this device.
•
Delete
: Click or touch this button to erase a Custom Application
definition.
•
Revert
: Click or touch this button to discard all changes made since
the last
Apply
operation.
•
Add
: Click or touch this button to add another row for defining a
Custom Application.