ZyXEL NBG420N Manuel d'utilisateur télécharger pdf (Page 155)

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Chapter 13 Firewall

NBG420N User’s Guide

155

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

server on the WAN.

2 The NBG420N reroutes the packet to Gateway A, which is in Subnet 2.

3 The reply from the WAN goes to the NBG420N.

4 The NBG420N then sends it to the computer on the LAN in Subnet 1.

Figure 96 Using IP Alias to Solve the Triangle Route Problem

13.3 General Firewall Screen

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

NBG420N’s firewall, and set up firewall logs.

Figure 97 Security > Firewall > General l

The following table describes the labels in this screen.

Table 57 Security > Firewall > General

LABEL DESCRIPTION

Enable Firewall Select this check box to activate the firewall. The NBG420N 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 NBG420N Manuel d'utilisateur Page 155

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