Problem
Some organizational security policies may mandate disabling the Address Resolution Protocol (ARP) on hosts. However, this configuration conflicts with the fundamental networking requirements for Terraform Enterprise.
Recommendation
Disabling ARP on Terraform Enterprise hosts is an unsupported configuration. HashiCorp Support cannot assist with issues that arise from operating Terraform Enterprise in this environment.
To ensure the stability, connectivity, and proper functioning of your Terraform Enterprise instance, you must keep ARP enabled on all hosts.
Technical Impact
ARP is a fundamental communication protocol used at the data link layer to map network layer IP addresses to link layer MAC addresses. Terraform Enterprise relies on standard networking protocols to function correctly. Disabling ARP will disrupt essential communication between Terraform Enterprise components and other network services, leading to unpredictable behavior and application failure.
Additional Information
For more details on infrastructure requirements, please refer to the official Terraform Enterprise networking documentation.