High latency and packet loss between server and client

[rocketman11]

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

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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

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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.

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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

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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

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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

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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:

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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:

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20 packets transmitted, 20 received, 0% packet loss, time 19028ms

rtt min/avg/max/mdev = 44.759/76.936/678.993/138.122 ms