Chapter 11 Firewall
1A computer on the LAN initiates a connection by sending a SYN packet to a receiving server on the WAN.
2The ZyXEL Device reroutes the packet to Gateway A, which is in Subnet 2.
3The reply from the WAN goes to the ZyXEL Device.
4The 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. |
|
|
| 123 |
ZyXEL | |
|
|