156-315.81.20 Gateway Deployment and Upgrades Practice Question
An administrator is upgrading a Security Gateway using CPUSE. The pre-upgrade verification fails with the error 'Unsupported configuration: IPv6 is enabled on interface eth0'. What is the most appropriate action to resolve this?
⚠ Common exam trap
The trap here is assuming that ignoring the warning is safe because IPv6 is not used, but the upgrade process requires it to be disabled on the interface.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Disable IPv6 on eth0 using the Gaia Portal or CLI before re-running the upgrade.
The pre-upgrade verification fails because IPv6 is enabled on eth0, which is unsupported for the upgrade. The correct resolution is to disable IPv6 on that interface using Gaia tools. This ensures the configuration meets the upgrade requirements and allows the process to proceed without errors.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Ignore the warning and proceed with the upgrade, as IPv6 is not used in the environment.
Why it's wrong here
Ignoring the warning is not advisable because the pre-upgrade verification is designed to prevent issues. Proceeding could lead to an unsupported state or upgrade failure. Even if IPv6 is not actively used, its presence on the interface can cause conflicts during the upgrade process. It's better to resolve the issue first.
- ✓
Disable IPv6 on eth0 using the Gaia Portal or CLI before re-running the upgrade.
Why this is correct
The error indicates that IPv6 is enabled on eth0, which is not supported for the upgrade. Disabling IPv6 on that interface aligns the configuration with upgrade requirements. This can be done via Gaia Portal (Network Management > Interfaces) or CLI (set interface eth0 ipv6-disable). After disabling, the pre-upgrade check should pass.
- ✗
Upgrade the gateway to an intermediate version that supports IPv6 before upgrading to R81.20.
Why it's wrong here
Upgrading to an intermediate version is unnecessary and does not address the root cause. The R81.20 upgrade does not support IPv6 on interfaces, so even an intermediate version would not resolve the issue. The solution is to disable IPv6 on eth0, not to perform additional upgrades that add complexity and risk.
- ✗
Remove the IPv6 address from eth0 but leave IPv6 enabled globally.
Why it's wrong here
The error specifies that IPv6 is enabled on eth0, not just an address assigned. Simply removing the address may not disable IPv6 on the interface. The upgrade requires IPv6 to be disabled on the interface. Leaving it enabled globally could still cause issues if the interface continues to have IPv6 capabilities. The correct action is to disable IPv6 on that interface.
Visual reference
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JA
Written and reviewed by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
Last reviewed September 2026 · checked against the official Check Point exam blueprint
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