4-Port ADSL Router User Manual

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This section describes two Configuration Manager features that
enable you to control the data passing through your network:
•
The IP filter feature enables you to create rules to block
attempts by certain computers on your LAN to access certain
types of data or Internet locations. You can also block incoming
access to computers on your LAN. Although IP filter rules
provide a very flexible and powerful tool to enhance network
security and control user activity, they can also be complex
and generally require an advanced understanding of IP
protocols.
•
The blocked protocols feature enables you to simply select
from a predefined list the protocol that you want to block.
All data passed to the ADSL Barricade using a blocked protocol
will be discarded, without consideration of the source computer,
destination computer, or the device interface on which it was
received.
Configuring IP Filters
When you define an IP filter rule and enable the feature, you
instruct the ADSL Barricade to examine each data packet
it receives to determine whether it meets criteria set forth in
the rule. The criteria can include the size of the packet, the
network or internet protocol it is carrying, the direction in which
it is traveling (for example, from the LAN to the Internet or vice
versa), the IP address of the sending computer, the destination
IP address, and other characteristics of the packet data.