Hello,
I am experiencing frequent TCP retransmissions, particularly with fragmented frames, when using the TSW212 switch. This issue does not occur with other switches in my network setup. Below are the details and steps to reproduce the problem.
Issue Details:
- Switch Model: TSW212
- Firmware Version: SW2_PROFINET_R_02.01.04.1
- Network Load: Low
- Operating Systems: The issue occurs regardless of the operating system. I have tested with both Unix and Windows systems.
- Switch configuration: The configuration corresponds to the factory settings, except for a fixed IP.
Steps to Reproduce:
- Setup:
- Device A (Receiver): Connected to Port 1 of the TSW212
- Device B (Sender): Connected to Port 2 of the TSW212
- Install iperf:
- On both devices, ensure iperf (not iperf3) is available. You can download iperf for various operating systems from iPerf - Download iPerf3 and original iPerf pre-compiled binaries.
- Start iperf Server on Device A (receiver):
- Open Command Prompt or Terminal and run:
iperf -s
- Start iperf Client on Device B (sender):
- Open Terminal and run:
iperf -c <IP-Address-of-Device-A> -l 7500 -t 1 -i 1
- Replace
<IP-Address-of-Device-A>with the actual IP address of Device A.
- Observation:
- Monitor the network traffic using Wireshark (below picture was made on receiver side). You will notice frequent TCP retransmissions, especially with fragmented frames.
192.178.1.42: Device-A (Sender)
192.178.1.170: Device-B (Receiver)
Additional Information:
- I have performed the same tests with other switches, such as the Cisco C1200-16T-2G and the Zyxel GS1100-24E V3, and the issue does not occur with these switches.
This issue is critical as it affects the reliability of our network communication. Any assistance or guidance on resolving this problem would be greatly appreciated. Can anyone reproduce this behavior or point out a misconfiguration I’ve made?
Thank you.
regards,
Mike