Appendix C – Firmware Upgrade Practices and Precautions
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Appendix C – Firmware Upgrade
Practices and Precautions
Prior performing any firmware upgrade, it is important that you save a back up of your
existing configuration (see the Save/Restore section in the chapter entitled System) to a
local file.
While we make every effort to ensure your existing configuration continues working after
minor and patch revision upgrades, sometimes compatibility problems may arise.
For major upgrades, existing configuration is not maintained. A factory reset must be
performed and the CyberGuard SG appliance reconfigured from scratch.
Note
CyberGuard SG firmware revision numbers have the form a.b.c, where a is the major
revision number, b is the minor revision number, and c is the patch revision number.
An upgrade where the major revision number is incremented is considered a major
upgrade, e.g. 2.1.5 -> 3.0.0. An upgrade where the minor revision number is
incremented is considered a minor upgrade, e.g. 3.0.2 -> 3.1.0. An upgrade where the
patch revision is incremented is considered a patch upgrade, e.g. 3.0.0 -> 3.0.1.
Warning
If the flash upgrade is interrupted (e.g. power down), the CyberGuard SG appliance
stops functioning and becomes unusable until its flash is reprogrammed at the factory or
a recovery boot is performed. User care is advised.
After the upgrade has completed successfully and the CyberGuard SG appliance is back
up and running with the new firmware, run through a few tests.
Ensure that Internet connectivity and any VPN connections can be established and pass
traffic, and that any configured services such as DHCP Server, Access Control or
Packet Filtering are functioning as expected.
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