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How to clear the configuration on a PIX Firewall
There are circumstances that administrators face where an out-of-the-box PIX Firewall is necessary. At these times, administrators may need to remove the existing configuration from a pre-configured PIX.
Sometimes it is necessary to clear an existing configuration on a PIX to either move it to a new location for a different use or to make it perform properly. In either case, it is important to understand the command necessary to do this and the impact that it has on performance.
Before you begin this process on an active network, save the existing configuration on your PIX to a TFTP server. This allows you to retrieve the configuration file if needed.
When the write erase command is issued to the PIX, the existing configuration that is saved to memory, NVRAM, is deleted. However, until the PIX is reloaded, it continues to perform using that configuration. Once the PIX is reloaded, the configuration returns to this set of default commands:
Only the password commands remain. This allows you continued access into the device. If the passwords are unknown, a password recovery is necessary. At this point, a specific configuration can be made.