> On Aug 7, 2025, at 3:17 AM, rain_alex via lists.fd.io > <wangdaobei=gmail....@lists.fd.io> wrote: > > It can be confirmed that what nginx sends is the last ACK packet from the > previous stream. I don't think there is a problem with VPP because it > accesses the same source port every 9 seconds. You can also see this in my > attachment.
Not sure there’s any problem, the only one that came to mind was the potential of rejected port reuse in time-wait by linux. If linux did not transition to time-wait because of dropped packets and lost retransmits and vpp timed out in close-wait/last-ack, then the problem is different. Those timeouts are configurable, in case you want to explore debugging this. > > The only thing I doubt about the kernel program is that at times nginx resets > the fin ack packet of the kernel program. I am not an expert in host stack. > Can I request the other party to send a reset instead of an ack by changing > or adding something in the fin ack packet? No, normally the peer stack should reset only if the state is wrong and/or the peer application was unable to receive all data. So for instance, if nginx closed the connection and had unread data, that would explain the reset. A full close from nginx followed by more data from vpp, e.g., ssl shutdown from client, might force a reset as well. > > My current solution is to immediately resend the syn packet instead of > waiting for RTO time when receiving an ack packet that does not meet the > requirements in the syn_sent state. If necessary, I can publish the code. Not sure about the solution here yet, but can review code and help drive towards a solution. Regards, Florin > > Regards, > Rain > > > > >
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