Filter
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DI-304/DI-304M ISDN Remote Router
!= : If the End Port is empty, the port number is not equal
to the value of the Start Port. Otherwise, this port number
is not between the Start Port and the End Port (including
the Start Port and End Port).
> : Specify the port number is larger than the Start Port
(includes the Start Port).
< : Specify the port number is less than the Start Port
(includes the Start Port).
♦ Keep State – When checked, protocol information about the
TCP/UDP/ICMP communication sessions will be kept by the IP
Filter/Firewall (the Firewall Protocol option requires that TCP or UDP or
TCP/UDP or ICMP be selected for this to operate correctly).
♦ Source Route – When Checked, the IP options of source routing will be
applied for the rule.
♦ Fragments – Specify a fragmented packets action.
◊ Don't Care - Specify no fragment options in the filter rule.
◊ Unfragmented - Apply the rule to unfragmented packets.
◊ Fragmented - Apply the rule to fragmented packets.
◊ Too Short - Apply the rule only to packets that are too short to
contain a complete header.
Restricting Unauthorized Internet Services
This section will show a simple example to restrict access of WWW from certain
locations. In this example, we assume the IP address of the access-restricted user is
192.168.1.10. The filter rule is created in the Data Filter set and is shown as below.
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