ZyXEL Communications Internet Security Gateway ZyWALL 100 - Manual (Page 158)

ZyWALL 100 Internet Security Gateway
14-2 Introducing the ZyWALL Firewall
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.
Figure 14-2 Menu 21.2 — Firewall Setup
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.
Figure 14-3 Example Firewall Log
Menu 21.2 - Firewall Setup
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
Press ENTER to Confirm or ESC to Cancel:
# Time Packet Information Reason Action
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 |<2,00> |
1|Jan 1 00 |From:172.20.1.179 To:172.21.1.66 |default policy |block
| 15:43:20|UDP src port:03571 dest port:00161 |<2,00> |
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 |<2,00> |
Clear Firewall Log (y/n):