ZyXEL Communications Vantage CNM 2.3 User Manual page 316

Chapter 10 Firewall
The following table describes the labels in this screen.
Table 125 Device Operation > Device Cofniguration > Firewall
LABEL
Global Setting
Enable
Firewall
Allow
Asymmetrical
Route
From Zone
To Zone
Page Size
The following read-only fields summarize the rules you have created that apply to traffic
traveling in the selected packet direction.
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DESCRIPTION
Select this check box to activate the firewall. The ZyWALL performs
access control when the firewall is activated.
If an alternate gateway on the LAN has an IP address in the same subnet
as the ZyWALL's LAN IP address, return traffic may not go through the
ZyWALL. This is called an asymmetrical or "triangle" route. This causes
the ZyWALL to reset the connection, as the connection has not been
acknowledged.
Select this check box to have the ZyWALL permit the use of asymmetrical
route topology on the network (not reset the connection).
Note: Allowing asymmetrical routes may let traffic from the WAN go
directly to the LAN without passing through the ZyWALL. A
better solution is to use virtual interfaces to put the ZyWALL
and the backup gateway on separate subnets.
This is the direction of travel of packets. Select from which zone the
packets come and to which zone they go.
Firewall rules are grouped based on the direction of travel of packets to
which they apply. For example, from LAN1 to LAN1 means packets
traveling from a computer or subnet on the LAN to either another
computer or subnet on the LAN1.
From any displays all the firewall rules for traffic going to the selected To
Zone.
To any displays all the firewall rules for traffic coming from the selected
From Zone.
From any to any displays all of the firewall rules.
To ZyWALL rules are for traffic that is destined for the ZyWALL and
control which computers can manage the ZyWALL.
Select how many entries you want to display on each page.
This is the index number of your firewall rule. It is not associated with a
specific rule.
The entry with a hyphen (-) instead of a number is the default firewall
behavior that the ZyWALL performs on traffic that does not match any
other traffic direction. Only the access right and log alert are configurable
for the default firewall rule. To apply other behavior, configure a firewall
rule that traffic will match so the ZyWALL will not have to use its default
behavior.
Vantage CNM User's Guide