Zyxel-communications NBG334SH Manual de usuario descargar pdf (Pagina 123)

Chapter 11 Firewall

ZyXEL NBG-334SH User’s Guide

123

1 A computer on the LAN initiates a connection by sending a SYN packet to a receiving

server on the WAN.

2 The ZyXEL Device reroutes the packet to Gateway A, which is in Subnet 2.

3 The reply from the WAN goes to the ZyXEL Device.

4 The ZyXEL Device then sends it to the computer on the LAN in Subnet 1.

Figure 69 Using IP Alias to Solve the Triangle Route Problem

11.3 General Firewall Screen

Click Security > Firewall to open the General screen. Use this screen to enable or disable the

ZyXEL Device’s firewall, and set up firewall logs.

Figure 70 General

The following table describes the labels in this screen.

Table 46 Firewall General

LABEL DESCRIPTION

Enable Firewall Select this check box to activate the firewall. The ZyXEL Device 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

apply.

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Zyxel-communications NBG334SH Manual de usuario Pagina 123