Hi guys, I made openvpn3 (required changes will be incorporated into main branch at some point) work with wintun and did performance testing in AWS.
Client: c5.xlarge, Windows Server 2016, patched openvpn3 test client and OpenVPN Connect 2.7.1.103 (uses tap-windows6, based on openvpn3). Server: c5.xlarge, Ubuntu 18.04, openvpn 2.4.4 Client and server instances are in the same VPC and placement group. iPerf3 running on server: > iperf3 -s -B 0.0.0.0 -V iPerf3 running on client: > iperf3 -c 10.8.0.1 -V (server VPN address) > iperf3 -c 10.0.0.18 -V (server VPC address) Results: - no vpn [ ID] Interval Transfer Bandwidth [ 4] 0.00-10.00 sec 8.67 GBytes 7.45 Gbits/sec sender [ 4] 0.00-10.00 sec 8.67 GBytes 7.45 Gbits/sec receiver CPU Utilization: local/sender 61.4% (5.6%u/55.8%s), remote/receiver 33.9% (1.7%u/32.2%s) - tap-windows6 [ ID] Interval Transfer Bandwidth [ 4] 0.00-10.00 sec 404 MBytes 339 Mbits/sec sender [ 4] 0.00-10.00 sec 404 MBytes 339 Mbits/sec receiver CPU Utilization: local/sender 4.6% (0.3%u/4.3%s), remote/receiver 21.4% (2.2%u/19.2%s) - wintun [ ID] Interval Transfer Bandwidth [ 4] 0.00-10.00 sec 536 MBytes 449 Mbits/sec sender [ 4] 0.00-10.00 sec 536 MBytes 449 Mbits/sec receiver CPU Utilization: local/sender 2.9% (0.1%u/2.8%s), remote/receiver 10.1% (0.7%u/9.3%s) As you see, wintun performs 30% better comparison to tap-windows6 and incurs significantly less CPU usage. -- -Lev
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