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CHAPTER
1-1
Cisco PIX Firewall and VPN Configuration Guide
78-15033-01
1
Getting Started
The Cisco PIX Firewall lets you establish stateful firewall protection and secure VPN access with a
single device. PIX
Firewall provides a scalable security solution with failover support available for
selected models to provide maximum reliability. PIX
Firewall uses a specialized operating system that
is more secure and easier to maintain than software firewalls that use a general-purpose operating
system, which are subject to frequent threats and attacks.
This chapter describes how you can use the PIX Firewall to protect your network assets and to establish
secure VPN access. It contains the following sections:
Controlling Network Access, page 1-1
Protecting Your Network from Attack, page 1-8
Supporting Specific Protocols and Applications, page 1-11
Creating a Virtual Private Network, page 1-14
Using PIX Firewall in a Small Office, Home Office Environment, page 1-19
Accessing and Monitoring PIX Firewall, page 1-20
PIX Firewall Failover, page 1-24
Upgrading the PIX Firewall OS and License, page 1-24
Using the Command-Line Interface, page 1-25
Before You Start Configuring PIX Firewall, page 1-31
Where to Go from Here, page 1-31
Controlling Network Access
This section describes the network firewall functionality provided by PIX Firewall. It includes the
following topics:
How the PIX Firewall Works, page 1-2
Adaptive Security Algorithm, page 1-3
Multiple Interfaces and Security Levels, page 1-4
How Data Moves Through the PIX Firewall, page 1-4
Address Translation, page 1-5
Cut-Through Proxy, page 1-6
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