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[perfsonar-user] I have retransmissions without packet loss


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  • From: Tom Yard <>
  • To:
  • Subject: [perfsonar-user] I have retransmissions without packet loss
  • Date: Mon, 24 Sep 2018 07:57:18 -0300
  • Ironport-phdr: 9a23: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
Dear people, we have tested two perfSONAR servers in the same network segment: one as a client and the other as a server. 

In the perfSONAR client box we have two interfaces in the same network segment,  using policy routing to make internal IP stack route the packets out on the designated interface: one interface for throughput tests with iperf3 at both machines and the other interface for latency and packet loss tests.

As a result, we have a graphic with 0% packet loss (one way and RTT), but we have some retransmissions in the throughput graphic.

Why do we have retransmissions if I have no packet loss at all ? I can't understand this situation...

Thanking in advance !!!

Tom

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