Casio CasioIsa 550 With Wifi 3y Security ISA550WBUN3K9 Manual De Usuario

Configuring Firewall Rules to Control Inbound and Outbound Traffic

Cisco ISA500 Series Integrated Security Appliances Administration Guide

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The zone-based firewall can permit or deny inbound or outbound traffic based on 
the zone, service, source and destination address, and schedule. 

Refer to the following topics: 

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A security zone is a group of interfaces to which a security policy can be applied 
to control traffic between zones. For ease of deployment, the Cisco ISA500 has 
several predefined zones with default security settings to protect your network. 
You can create additional zones as needed.

Each zone has an associated security level. The security level represents the level 
of trust, from low (0) to high (100). Default firewall rules are created for all 
predefined zones and your new zones, based on these security levels. For 
example, by default all traffic from the LAN zone (with a Trusted security level) to 
the WAN zone (with an Untrusted security level) is allowed but traffic from the 
WAN (Untrusted) zone to the LAN (Trusted) zone is blocked. You can create and 
modify firewall rules to specify the permit or block action for specified services, 
source and destination addresses, and schedules.

To learn more, see the 

 table.