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Cisco ASA and PIX Firewall Handbook by Dave Hucaby

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4-2. Managing the Flash File System

Every Cisco firewall has a Flash (nonvolatile) memory file system. Files such as the firewall operating system image, a firewall management application image, and the firewall configuration can be stored for use. This section discusses the various types of files and how to navigate and use the Flash file system. The Flash file system can be characterized by the following features:

  • The operating system for Cisco firewalls is stored in Flash memory in a compressed format. In PIX 6.x, only one image can be stored in Flash at any time. FWSM allows one image to be stored in each of two Flash memory partitions, although only one image can be run at any time.

    PIX 7.x loosens this restriction, allowing multiple images; ...

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