ZyXEL nbg-334w Guia Do Utilizador
Chapter 12 Firewall
NBG334W User’s Guide
129
1 A computer on the LAN initiates a connection by sending a SYN packet to a receiving
server on the WAN.
2 The NBG334W reroutes the packet to Gateway A, which is in Subnet 2.
3 The reply from the WAN goes to the NBG334W.
4 The NBG334W then sends it to the computer on the LAN in Subnet 1.
3 The reply from the WAN goes to the NBG334W.
4 The NBG334W then sends it to the computer on the LAN in Subnet 1.
Figure 69 Using IP Alias to Solve the Triangle Route Problem
12.3 General Firewall Screen
Click Security > Firewall to open the General screen. Use this screen to enable or disable the
NBG334W’s firewall, and set up firewall logs.
NBG334W’s firewall, and set up firewall logs.
Figure 70 Security > Firewall > General l
The following table describes the labels in this screen.
Table 50 Security > Firewall > General
LABEL
DESCRIPTION
Enable Firewall
Select this check box to activate the firewall. The NBG334W performs access
control and protects against Denial of Service (DoS) attacks when the firewall is
activated.
Packet Direction
This is the direction of travel of packets.
Firewall rules are grouped based on the direction of travel of packets to which they
Firewall rules are grouped based on the direction of travel of packets to which they
apply.