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Why when I use OpenVPN with sample config file and want to measure performance with netperf UDP_STREAM, I get this error:
$ netperf -H 10.8.0.1 -t UDP_STREAM
MIGRATED UDP STREAM TEST from 0.0.0.0 () port 0 AF_INET to 10.8.0.1 () port 0 AF_INET
send_data: data send error: errno 101
netperf: send_omni: send_data failed: Network is unreachable
It seems that this problem is related to the versions of netperf on server side and on the client side. If in both sides, we use the same version of netperf, this problem can be solved.