ZyWALL USG Series User’s Guide
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CHAPTER 27
Security Policy
27.1 Overview
A security policy is a template of security settings that can be applied to specific traffic at specific times.
The policy can be applied:
• to a specific direction of travel of packets (from / to)
• to a specific source and destination address objects
• to a specific type of traffic (services)
• to a specific user or group of users
• at a specific schedule
The policy can be configured:
• to allow or deny traffic that matches the criteria above
• send a log or alert for traffic that matches the criteria above
• to apply the actions configured in the UTM profiles (application patrol, content filter, IDP, anti-virus,
anti-spam) to traffic that matches the criteria above
Note: Security policies can be applied to both IPv4 and IPv6 traffic.
The security policies can also limit the number of user sessions.
The following example shows the Zyxel Device’s default security policies behavior for a specific direction
of travel of packets. WAN to LAN traffic and how stateful inspection works. A LAN user can initiate a
Telnet session from within the LAN zone and the Zyxel Device allows the response. However, the Zyxel
Device blocks incoming Telnet traffic initiated from the WAN zone and destined for the LAN zone.
Figure 402 Default Directional Security Policy Example
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