User Manual

VisionNet 202ER ADSL Ethernet Router User’s Guide
120
2. Enter or select data for each field that applies to your rule.
The following table describes the fields:
Field Description
Rule ID
Each rule must be assigned a sequential ID
number. Rules are processed from lowest to
highest on each data packet, until a match is
found. It is recommended that you assign
rule IDs in multiples of 5 or 10 (e.g., 10, 20,
30) so that you leave enough room between
them for inserting a new rule if necessary.
Action
Specifies the action that will be taken when a
packet matches the rule criteria. The action
can be Accept (forward to destination) or
Deny (discard the packet).
Direction
Specifies whether the rule should apply to
data packets that are incoming or outgoing
on the selected interface.
Incoming refers to packets coming from the
LAN, and outgoing refers to packets going to
the Internet.
You can use rules that specify the incoming
direction to prevent outside accesses to your
LAN.
Interface
Specifies the interface on the VisionNet
202ER on which the rule will take effect. See
the examples on page 124 for suggestions
on choosing the appropriate interface for
various rule types.
In Interface
Specifies the interface from which packets
must have been forwarded to the interface
specified in the previous selection. This
option is valid only for the outgoing direction.
Log Option When Enabled is selected, a log entry will be
created on the system each time this rule is
invoked. The log entry will include the time of
the violation, the source address of the
computer responsible for the violation, the
destination IP address, the protocol being
used, the source and destination ports, and
the number violations occurring in the
previous x minutes. (Logging may be helpful
when troubleshooting.) This information can
also be e-mailed to designated
administrators. See Chapter 17, “Configuring
Firewall Settings” for instructions.
Security Level
Specifies the security level that must be
enabled globally for this rule to take affect. A
rule will be active only if its security level is
the same as the globally configured setting
(shown on the main IP Filter page). For
example, if the rule is set to Medium and the
global firewall level is set to Medium, then the
rule will be active; but if the global firewall
level is set to High or Low, then the rule will
be inactive.