Transparent Firewall

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Aug 25th, 2009
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If you want to manage a transparent firewall that resides in a different VLAN/IP subnet do you just add a route to the transparent firewall back to the managing host?

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jbayuka Tue, 09/01/2009 - 14:11
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A typical Cisco IOS Firewall is a Layer 3 device with trusted and untrusted interfaces on different IP subnets. A Layer 3 firewall works well with Cisco IOS devices that function as routers with preexisting subnet separations. However, when a Layer 3 firewall is placed in an existing network, the network IP addresses must be reconfigured to accommodate the firewall.


A transparent Cisco IOS firewall acts as a Layer 2 transparent bridge with context-based access control (CBAC) and ACLs configured on the bridged interface. Because the Layer 2 firewall intercepts packets at Layer 2 and is "transparent" to the existing network, Layer 3 firewall limitations are not applicable.


Collin Clark Wed, 09/02/2009 - 05:33
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Transparent firewall mode on the security appliance allows only two interfaces to pass through traffic. However, you can set up a dedicated management interface, which can be either a physical interface or a subinterface, as a third interface. This interface must be set up for the management-only command. Place this interface into your management VLAN.


Hope that helps.

jthomp7626 Fri, 09/04/2009 - 13:02
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Hello. PTI


Will this scenario support TACACS+ commands? Want to enable report generation in TAACS+ Administration.

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