Hey all, we have a weird behavior of one of our devices and I wonder if anyone could provide any pointers as to what is going on. (pcap attached)
Scenario: * Our device is 172.22.66.200 in this capture * Other device is 172.22.67.200 * Pcap contains only one TCP stream between the two * We are using the socket API on top of LWIP 1.4.1 Good behavior: * In #9, the peer sends a retransmission because our device didn't answer for 240ms * In #10, we ACK that retransmission with no payload and everything looks fine Weird behavior: * In #92 there is another retransmission by the peer after 527ms and we even take another 478ms to answer * #93 ACKs the retransmission but does not increase the ACK number to include the payload of the retransmission * So that retransmission is sent again and again (exponential back-off) but the payload is never ACKed * Meanwhile our device happily sends payloads and the gateway ACKs them What is happening here? Kind regards Fabian
LWIP_retrans_ACK.pcapng
Description: LWIP_retrans_ACK.pcapng
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