ZyXEL ZyWALL USG 50 Manual Do Utilizador

 Chapter 22 Firewall

ZyWALL USG 50 User’s Guide

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

Figure 226   Configuration > Firewall        

The following table describes the labels in this screen. 

Table 108   Configuration > Firewall

General 

Settings
Enable 

Firewall

Select this check box to activate the firewall. The ZyWALL performs 

access control when the firewall is activated.

Allow 

Asymmetrical 

Route

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. 

Firewall Rule Summary