Chapter 3 Examining Modes of Operation

The Firewall Services Module (FWSM) has the capability to function in two modes: transparent and routed. With the introduction of version 3.1, mixed-mode operation is also supported. This allows the capability to have both transparent and routed contexts operate simultaneously on the same FWSM.

Working with Transparent Mode

The transparent mode feature on the FWSM configures the firewall to act in a Layer 2 mode, meaning that it will bridge between networks. Transparent mode helps provide a seamless transition when adding the FWSM into an existing infrastructure, by eliminating changes to the existing IP addressing scheme that otherwise would be needed.

With the FWSM configured for transparent mode, it ...

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