Dear community developers: I use vnet_connect function to initiate a large number of connections to the nginx server. I have calculated the latency and found that there are a large number of syn retransmissions. After capturing the packet, I discovered an issue: when the VPP accesses it again using the same source port after 10 seconds, nginx mistakenly considers it to be a packet from the previous connection and sends back an incorrect ACK message. This doesn't always happen, the probability is about one in ten. I switched to using Linux to write the client and also made a large number of connections. Sometimes, it would use the same source port every 2 seconds, but there were no problems. The nginx server has been configured 2msl = 1. Both sides are Ubuntu. I don't even know if this is a VPP issue. The captured package was included with the problem. IP "10.1.1.181" is nginx server. If any experts can answer my questions, I would be extremely grateful.
Best Regards, Rain
ser_1.pcap
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