Cisco PIX 525 Specifikace stáhnout pdf (Strana 395)

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Cisco PIX Firewall and VPN Configuration Guide

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Chapter 11 Changing Feature Licenses and System Software

Downgrading to a Previous Software Version

Step 5 You can now enter commands to download the binary image from the TFTP server. In most cases, you

need only specify the address, server, and file commands, and then enter the tftp command to start the

download. The commands are as follows:

a. If needed, use a question mark (?) or enter the help command to list the available commands.

b. Use the address command to specify the IP address of the network interface on which the TFTP

server resides.

c. Use the server command to specify the IP address of the host running the TFTP server.

d. Use the file command to specify the filename of the PIX Firewall image.

e. If needed, use the gateway command to specify the IP address of a router gateway through which

the server is accessible.

f. If needed, use the ping command to verify accessibility. If this command fails, fix access to the

server before continuing. You can use the interface command to specify which interface the ping

traffic should use. The Boothelper defaults to the interface 1 (one).

g. Use the tftp command to start the download.

Step 6 After the image downloads, you are prompted to install the new image. Enter y.

Step 7 When you are prompted, enter your activation key.

Step 8 After you enter your activation key, PIX Firewall prompts you to remove the Boothelper diskette. You

have 30 seconds to remove the diskette. During this time you have three options:

a. Remove the diskette and reboot the unit with the reboot switch.

b. Use the reload command while the diskette is in the unit.

c. After the interval, the PIX Firewall will automatically boot from the Boothelper diskette.

After Boothelper downloads the PIX Firewall image via TFTP, it verifies the checksum of the image. If

it is not Version 5.1 or later, it displays the message “Checksum verification on flash image failed” and

reboots the PIX

Firewall.

Keep the Boothelper diskette available for future upgrades. You will need to repeat these steps whenever

you download an image to your PIX

Firewall unit. Alternatively, you can use the copy tftp flash

command to download an image directly from the PIX

Firewall command line.

Downgrading to a Previous Software Version

This section describes how to change the PIX Firewall to an earlier version of the software than the

version currently running on your PIX

Firewall unit. You can only downgrade the PIX Firewall software

if your platform supports the earlier version.

Note Always use the most recent version of the PIX Firewall software to take advantage of the latest security

features and functionality. Earlier versions of the PIX

Firewall will not support the configuration of

features introduced in a later version.

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