RDMA is a useful technology for high speed and low latency. Generally, RDMA is developed for relatively short distance communication, but we conduct long distance communication over APN using RDMA in PoC. We report the results of the objectives, to determine the dependence of maximum bandwidth on distance of the RDMA-over-Open-APN, stated in the PoC reference. We prepared configuration which meets key requirements and conducted step-by-step performance test. As a result, we obtained high performance and confirmed that we achieved objectives.