ZyXEL ZyWALL USG 300 User Guide - Page 458
Stateful Inspection, Zones, Default Firewall Behavior
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Chapter 24 Firewall 24.1.2 What You Need to Know Stateful Inspection The ZyWALL has a stateful inspection firewall. The ZyWALL restricts access by screening data packets against defined access rules. It also inspects sessions. For example, traffic from one zone is not allowed unless it is initiated by a computer in another zone first. Zones A zone is a group of interfaces or VPN tunnels. Group the ZyWALL's interfaces into different zones based on your needs. You can configure firewall rules for data passing between zones or even between interfaces and/or VPN tunnels in a zone. Default Firewall Behavior Firewall rules are grouped based on the direction of travel of packets to which they apply. Here is the default firewall behavior for traffic going through the ZyWALL in various directions. Table 118 Default Firewall Behavior FROM ZONE TO ZONE BEHAVIOR From WAN to ZyWALL Traffic from the WAN to the ZyWALL itself is allowed for certain default services described in To-ZyWALL Rules on page 459. All other WAN to ZyWALL traffic is dropped. From WAN to any (other Traffic from the WAN to any of the networks behind the than the ZyWALL) ZyWALL is dropped. From DMZ to ZyWALL Traffic from the DMZ to the ZyWALL itself is allowed for certain default services described in To-ZyWALL Rules on page 459. All other DMZ to ZyWALL traffic is dropped. From DMZ to any (other Traffic from the DMZ to any of the networks behind the than the ZyWALL) ZyWALL is dropped. From WLAN to WAN Traffic from the WLAN to the WAN is allowed. From WLAN to ZyWALL Traffic from the WLAN to the ZyWALL itself is allowed for certain default services described in To-ZyWALL Rules on page 459. All other WLAN to ZyWALL traffic is dropped. From WLAN to any Traffic from the WLAN to any of the networks behind the (other than the ZyWALL) ZyWALL is dropped. From ANY to ANY Traffic that does not match any firewall rule is allowed. So for example, LAN to WAN, LAN to DMZ, and LAN to WLAN traffic is allowed. This also includes traffic to or from interfaces or VPN tunnels that are not assigned to a zone (extra-zone traffic). 458 ZyWALL USG 300 User's Guide
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