But, it is always 0 in different security zones names, i.e. Traffic from High-Security Level to Low-Security Level is allowed by default.īy default, inside security zone has a security level of 100.Usually, we assign Highest Security Level to the LAN / Corporate Interface. This is the highest security level and it is assigned to the most Trusted Interface/Zone.To have a better understanding of the Security Level let’s discuss the below examples: Cisco ASA: Security Level 100 You must need to configure ACL to allow that particular traffic. Similarly, the traffic from the Low-Security Level to the High-Security Level is denied by default. 100, and the lowest security level to the Outside or Internet interface, i.e. So, usually, we define the highest security level to the LAN or Inside interface i.e. It has a DMZ security zone with a 50 security level.īy default, all traffic from the Highest Security Level to the Lowest Security Level is allowed. Interface Gig0/2 is configured with IP address 172.16.1.1/24 and it’s connected with the DMZ Network. It has an inside security zone with a 100 security level. Interface Gig0/1 is configured with IP address 192.168.1.1/24 and it’s connected with the internal Core. It has an outside security zone with a 0 security level. Interface Gig0/0 is configured with IP Address 1.1.1.1/29 and it’s connected with ISP. High-Security Level means we have higher trust and Low-Security Level means Lower trust in that particular zone.įirst, have a look at the below image to understand the security levels.Ĭisco ASA Firewall has configured 3 different interfaces. Security Level is nothing but a number between 0 to 100. Now, let’s understand the Security Level! Security Levels in Cisco ASA Firewall We can easily control the traffic among different security zones using ACL (Access Control Lists).
So, multiple interfaces can have different security levels and different zones. In Routing or Layer 3 mode deployment, we must need to define an IP Address, Security Level, and nameif ( Zone) on each interface.Ī single logical interface has only one security zone and Security Level. Understanding Interfaces and Security Zones in Cisco ASA Firewallīefore understanding the Security Levels, let’s understand the Interfaces and Security Zones in Cisco ASA Firewall.
Let’s have a better understanding of Security Levels and Zones. Further, We need to assign the Security Level to each logical interface. During the initial deployment of the Cisco ASA firewall in Layer 3 or Routing Mode we need to configure the security zones on each logical interface.
In this article, we will discuss Cisco ASA Firewall Security Levels and Zones in detail.
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