This article explains the scenario where Security Director removes Proxy ARP settings while updating a NAT policy and provides steps to prevent this behavior.

• Proxy ARP settings configured on the device are removed.

• NAT policy updates complete successfully, but Proxy ARP configuration is deleted.

Disable Proxy ARP management options in Security Director.

1. Log in to the Security Director UI.

2. Navigate to:

Configure > NAT Policies

3. Edit the affected NAT policy.

4. Disable the following options:

• Security Director manages Proxy ARP

• Auto ARP Configuration

5. Save the changes and redeploy the NAT policy.

After disabling these options, Security Director will no longer remove Proxy ARP settings during NAT policy updates.

Note: If the issue persists, please contact JUNIPER JTAC Support for further assistance.