Cisco ASA Training Zero To Hero | Transparent Firewall | Lesson 14
Traditionally, a firewall is a routed hop and acts as a default gateway for hosts that connect to one of its
screened subnets. A transparent firewall, on the other hand, is a Layer 2 firewall that acts like a “bump in the
wire,” or a “stealth firewall,” and is not seen as a router hop to connected devices. However, like any other
firewall, access control between interfaces is controlled, and all of the usual firewall checks are in place.
Layer 2 connectivity is achieved by using a "bridge group" where you group together the inside and outside
interfaces for a network, and the ASA uses bridging techniques to pass traffic between the interfaces. Each
bridge group includes a Bridge Virtual Interface (BVI) to which you assign an IP address on the network.
You can have multiple bridge groups for multiple networks. In transparent mode, these bridge groups cannot
communicate with each other.
The Cisco ASA Family of security devices protects corporate networks and data centers of all sizes. It provides users with highly secure access to data and network resources - anytime, anywhere, using any device. Cisco ASA devices represent more than 15 years of proven firewall and network security engineering and leadership, with more than 1 million security appliances deployed throughout the world.
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