I have an OpenVPN server that has two clients in the subnet. When I ssh from Client 1 to Client 2, there is long lag when I type and when letter appears in terminal. SSH from OpenVPN server to Client 2, there is no lag. There is lag between OpenVPN server and Client 2 back and forth using SSH. All three nodes are running Debian, the server is configured UDP. How can I begin to troubleshoot this?
1) Ping from client 1 to client 2 via the tunnel
20 packets transmitted, 14 received, 30% packet loss, time 19169ms
rtt min/avg/max/mdev = 70.827/72.071/78.295/1.815 ms
2) Ping from client 2 to client 1 via the tunnel
60 packets transmitted, 55 received, 8% packet loss, time 59383ms
rtt min/avg/max/mdev = 70.730/176.441/5773.739/761.702 ms, pipe 6
3) Ping from OpenVPN server to client 2: Here the avg latency varies from 35 ms to 1741 ms. The results below are from second trial of ping.
20 packets transmitted, 20 received, 0% packet loss, time 19251ms
rtt min/avg/max/mdev = 26.454/1741.058/5625.208/1952.415 ms, pipe 6
4) Ping from Client 2 to OpenVPN server
20 packets transmitted, 20 received, 0% packet loss, time 19251ms
rtt min/avg/max/mdev = 26.454/1741.058/5625.208/1952.415 ms, pipe 6
5) Ping from Client 1 to OpenVPN server
Try 1: Significant packet loss
38 packets transmitted, 27 received, 28% packet loss, time 37260ms
rtt min/avg/max/mdev = 44.601/516.754/6025.636/1480.910 ms, pipe 6
Try 2: Not much packet loss
20 packets transmitted, 20 received, 0% packet loss, time 19022ms
rtt min/avg/max/mdev = 44.712/98.499/1077.521/224.708 ms, pipe 2
6) Ping from OpenVPN server to client 1
Try 1:
20 packets transmitted, 20 received, 0% packet loss, time 19027ms
rtt min/avg/max/mdev = 44.703/44.979/45.196/0.192 ms
Try 2:
20 packets transmitted, 20 received, 0% packet loss, time 19028ms
rtt min/avg/max/mdev = 44.759/76.936/678.993/138.122 ms
