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Chapter 19 Firewall
ZyWALL USG 100/200 Series User’s Guide
337
To-ZyWALL Rules
Rules with ZyWALL as the To Zone apply to traffic going to the ZyWALL itself. By default:
• The firewall allows LAN1 and WLAN computers to access or manage the ZyWALL.
• The ZyWALL drops most packets from the WAN zone to the ZyWALL itself, except for
VRRP traffic for Device HA and ESP/AH/IKE/NATT/HTTPS services for VPN tunnels,
and generates a log.
• The ZyWALL drops most packets from the DMZ zone to the ZyWALL itself, except for
DNS and NetBIOS traffic, and generates a log.
When you configure a firewall rule for packets destined for the ZyWALL itself, make sure it
does not conflict with your service control rule. See Chapter 43 on page 665 for more
information about service control (remote management). The ZyWALL checks the firewall
rules before the service control rules for traffic destined for the ZyWALL.
You can configure a To-ZyWALL firewall rule (with From Any To ZyWALL direction) for
traffic from an interface which is not in a zone.
Global Firewall Rules
Firewall rules with from any and/or to any as the packet direction are called global firewall
rules. The global firewall rules are the only firewall rules that apply to an interface or VPN
tunnel that is not included in a zone. The from any rules apply to traffic coming from the
interface and the to any rules apply to traffic going to the interface.
Firewall Rule Criteria
The ZyWALL checks the schedule, user name (user’s login name on the ZyWALL), source IP
address, destination IP address and IP protocol type of network traffic against the firewall
rules (in the order you list them). When the traffic matches a rule, the ZyWALL takes the
action specified in the rule.
User Specific Firewall Rules
You can specify users or user groups in firewall rules. For example, to allow a specific user
from any computer to access a zone by logging in to the ZyWALL, you can set up a rule based
on the user name only. If you also apply a schedule to the firewall rule, the user can only
access the network at the scheduled time. A user-aware firewall rule is activated whenever the
user logs in to the ZyWALL and will be disabled after the user logs out of the ZyWALL.
Firewall and Application Patrol
To use a service, make sure both the firewall and application patrol allow the service’s packets
to go through the ZyWALL. The ZyWALL checks the firewall rules before the application
patrol rules for traffic going through the ZyWALL.