Cisco PIX 525 Spezifikationen PDF herunterladen (Seite 196)

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Cisco Security Appliance Command Line Configuration Guide

OL-6721-01

Chapter 12 Firewall Mode Overview

Transparent Mode Overview

Using the Transparent Firewall in Your Network

Figure 12-7 shows a typical transparent firewall network where the outside devices are on the same

subnet as the inside devices. The inside router and hosts appear to be directly connected to the outside

router.

Figure 12-7 Transparent Firewall Network

Transparent Firewall Guidelines

Follow these guidelines when planning your transparent firewall network:

• A management IP address is required; for multiple context mode, an IP address is required for each

context.

Unlike routed mode, which requires an IP address for each interface, a transparent firewall has an

IP address assigned to the entire device. The security appliance uses this IP address as the source

address for packets originating on the security appliance, such as system messages or AAA

communications.

The management IP address must be on the same subnet as the connected network. You cannot set

the subnet to a host subnet (255.255.255.255).

• The transparent security appliance uses an inside interface and an outside interface only. If your

platform includes a dedicated management interface, you can also configure the management

interface or subinterface for management traffic only.

In single mode, you can only use two data interfaces (and the dedicated management interface, if

available) even if your security appliance includes more than two interfaces.

10.1.1.1

10.1.1.2

Management IP

10.1.1.3

192.168.1.2

Network A

Network B

Internet

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