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ZyWALL USG 20-2000 User’s Guide 53
CHAPTER 3
Protecting Your Network
These sections cover configuring the ZyWALL to protect your network.
Firewall on page 53
User-aware Access Control on page 54
Endpoint Security (EPS) on page 55
Device and Service Registration on page 55
Anti-Virus Policy Configuration on page 56
IDP Profile Configuration on page 58
ADP Profile Configuration on page 59
Content Filter Profile Configuration on page 61
Viewing Content Filter Reports on page 63
Anti-Spam Policy Configuration on page 66
3.1 Firewall
The firewall controls the travel of traffic between or within zones for services using static port
numbers. Use application patrol to control services using flexible/dynamic port numbers (see
Section 5.8 on page 120 for an example). The firewall can also control traffic for NAT (DNAT) and
policy routes (SNAT). Firewall rules can use schedule, user, user groups, address, address group,
service, and service group objects. To-ZyWALL firewall rules control access to the ZyWALL itself
including management access. By default the firewall allows various types of management from the
LAN, HTTPS from the WAN and no management from the DMZ. The firewall also limits the number
of user sessions.
This example shows the ZyWALL’s default firewall behavior for WAN to LAN traffic and how stateful
inspection works. A LAN user can initiate a Telnet session from within the LAN zone and the firewall
allows the response. However, the firewall blocks Telnet traffic initiated from the WAN zone and
destined for the LAN zone. The firewall allows VPN traffic between any of the networks.
Figure 28 Default Firewall Action
LAN
WAN
53


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