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Chapter 6 Maintenance
ZyWALL USG 20-2000 User’s Guide
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The default configuration files are:
system-default.conf: This file contains all of the ZyWALL settings. If you apply this file, the
ZyWALL’s default IP address and password will be restored.
startup-config.conf: This is the configuration file that the ZyWALL is currently using. All the
changes you have saved/applied in the Web Configurator or in CLI commands (when you use the
write command) are applied to this file.
lastgood.conf: This is the most recently used (valid) configuration file that was saved when the
device last restarted. If you upload and apply a configuration file with an error, you can apply
lastgood.conf to return to a valid configuration.
6.4.1 What Can Go Wrong
You cannot upload system-default.conf or lastgood.conf.
During boot up, the ZyWALL first applies start-up.conf. If the application is successful, it will be
copied into lastgood.conf. If the application fails, the ZyWALL will try to apply lastgood.conf.
•If lastgood.conf.fails to apply, the ZyWALL will restore by using the system-default.conf file
so that the device can boot up normally.
6.5 How to Manage ZyWALL Firmware
Click Maintenance > File Manager > Firmware Package. Use this screen to check current
firmware version and upload firmware to the ZyWALL.
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