> Source: [sk44280](https://support.checkpoint.com/results/sk/sk44280)

# sk44280 - 'There is only one interface defined for CLUSTER_OBJECT_NAME. At least one more interface must be configured for this object in order to use the Anti-Spoofing feature.' message when installing policy

| Property | Value |
|----------|-------|
| Solution ID | sk44280 |
| Date Created | 2010-02-25 |
| Last Modified | 2023-02-08 |
| Technical Level | Advanced |
| Products | Security Gateway |
| Versions | R81.20, R81.10 (EOS), R81 (EOS) |

## Symptoms

- * 'There is only one interface defined for *CLUSTER_OBJECT_NAME* . At least one more interface must be configured for this object in order to use the Anti-Spoofing feature.' message when installing policy.  

* This object has two interfaces configured, and there is one interface configured with Anti-Spoofing enabled.

## Cause

This issue will occur if you have configured one interface as Internal or External, and the other interface as 1st Sync.

A Sync interface is not considered to be part of production traffic. Therefore, Anti-Spoofing cannot be enforced on this interface.

## Solution

This solution requires authentication. Please log in to view the full solution.

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