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Load a New Cisco PIX Software Image from a TFTP Server

TFTP (trivial file transfer protocol) provides a convenient means of quickly transferring a Cisco IOS image to a firewall over an ethernet interface. This procedure is substantially faster than transferring over a serial port.

Step 1: Copy the IOS binary file to the TFTP directory.

By default on most UNIX systems, the default data directory for the TFTP server is /tftpboot. Copy the IOS image file to this directory and make sure it is world readable (i.e., chmod 544 /tftpboot/filename.bin). The first time you try this procedure, or anytime you experience troubles, test the TFTP server configuration with the tftp client:

cd /tmp
tftp localhost
get filename.bin

You can change directory to /tmp or any other directory that does not contain the image file. You must use the exact name of your binary file.
If there are no error messages, proceed; otherwise troubleshoot based on the error message.

Step 2: Configure an ethernet interface on the firewall if not already configured.

Test the configuration by pinging the ip address of the TFTP server from the firewall.

Step 3: Load the IOS image

From enable mode on the firewall, the following command will load the IOS image in filename.bin from the TFTP server at IP address

copy tftp:// flash

You will be asked to confirm this procedure. Press ENTER to confirm.

Step 4: Restart the firewall

From enable mode, use the ‘reload’ command to restart the firewall.

Quinn McHenry
Quinn McHenry
Quinn was one of the original co-founders of Tech-Recipes. He is currently crafting iOS applications as a senior developer at Small Planet Digital in Brooklyn, New York.


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