Figure 14-2 Menu 21.2 - Firewall Setup; Figure 14-3 Example Firewall Log; Activating The Firewall - ZyXEL Communications ZyWall 100 User Manual

ZyWALL 100 Internet Security Gateway

14.3.1 Activating the Firewall

Enter option 2 in this menu to bring up the following screen. Press [SPACE BAR] and then [ENTER] to
select Yes in the Active field to activate the firewall. The firewall must be active to protect against Denial of
Service (DoS) attacks. Additional rules may be configured using the web configurator.
The firewall protects against Denial of Service (DoS) attacks when
it is active. The default Policy sets
1. allow all sessions originating from LAN to LAN/WAN/DMZ
2. deny all sessions originating from WAN/DMZ to LAN
3. allow all sessions originating from WAN/DMZ to WAN/DMZ
4. allow all sessions originating from LAN to LAN
5. deny all sessions originating from WAN to WAN, from DMZ to DMZ
You may define additional Policy rules or modify existing ones but
please exercise extreme caution in doing so
Active: Yes
Please configure the Firewall function through Web Configurator
Configure the firewall rules using the web configurator or CLI commands.
14.3.2 Viewing the Firewall Log
In menu 21, enter 3 to view the firewall log. An example of a firewall log is shown next.
# Time Packet Information
0|Jan 1 00 |From:192.168.17.1 To:192.168.17.255 |default policy |block
| 15:43:19|UDP src port:00520 dest port:00520
1|Jan 1 00 |From:172.20.1.179 To:172.21.1.66
| 15:43:20|UDP src port:03571 dest port:00161
2|Jan 1 00 |From:172.21.1.148 To:172.21.255.255 |default policy |block
| 15:43:20|UDP src port:00137 dest port:00137
Clear Firewall Log (y/n):
14-2
Menu 21.2 - Firewall Setup
Press ENTER to Confirm or ESC to Cancel:
Figure 14-2 Menu 21.2 — Firewall Setup

Figure 14-3 Example Firewall Log

Reason Action
|<2,00> |
|default policy |block
|<2,00> |
|<2,00> |
Introducing the ZyWALL Firewall