Draytek Vigor2800 Series User Manual page 51

Branch to other Filter
Set
Log
Direction
Protocol
IP Address
Subnet Mask
Operator, Start Port
and End Port
Keep State
Fragments
Vigor2800 Series User's Guide
Block If No Further Match - A packet matching the rule, and that
does not match further rules, will be dropped.
Pass If No Further Match - A packet matching the rule, and that
does not match further rules, will be passed through.
If the packet matches the filter rule, the next filter rule will branch
to the specified filter set. Select next filter rule to branch from the
drop-down menu.
Check this box to enable the log function. Use the Telnet command
log-f to view the logs.
Set the direction of packet flow. It is for Data Filter only. For the
Call Filter, this setting is not available since Call Filter is only
applied to outgoing traffic.
Specify the protocol(s) which this filter rule will apply to.
Specify a source and destination IP address for this filter rule to apply
to. Place the symbol "!" before a specific IP Address will prevent this
rule from being applied to that IP address. To apply the rule to all IP
address, enter any or leave the field blank.
Select the Subnet Mask for the IP Address column for this filter rule
to apply from the drop-down menu.
The operator column specifies the port number settings. If the Start
Port is empty, the Start Port and the End Port column will be
ignored. The filter rule will filter out any port number.
(=) If the End Port is empty, the filter rule will set the port
number to be the value of the Start Port. Otherwise, the port
number ranges between the Start Port and the End Port (including
the Start Port and the End Port).
(!=)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).
This function should work along with Direction, Protocol, IP address,
Subnet Mask, Operator, Start Port and End Port settings. It is used
for Data Filter only.
Keep State is in the same nature of modern term Stateful Packet
Inspection. It tracks packets, and accept the packets with appropriate
characteristics showing its state is legal as the protocol defines. It
will deny unsolicited incoming data. You may select protocols from
any, TCP, UDP, TCP/UDP, ICMP and IGMP.
Specify the action for fragmented packets. And it is used for Data
Filter only.
Don't care -No action will be taken towards fragmented packets.
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.
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