ZyXEL Communications ZyWall USG 2000 User Manual page 439

Unified security gateway

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• The ordering of your rules is very important as rules are applied in sequence.

Figure 324 Configuration > Firewall

The following table describes the labels in this screen.

Table 114 Configuration > Firewall

Asymmetrical

ZyWALL USG 2000 User's Guide

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.

Chapter 24 Firewall

Troubleshooting