![]() Operating System and version: Ubuntu 20.The 10.6.96.89 and 10.6.85.63 is an A record for the request domain When we look at the Wireshark (Figure 13.9), we see that there are many retransmission. After receiving a message, the receiver sends the acknowledgment for the last accepted sequence number. The Transmission Control Protocol (TCP) is a core protocol of the. Each bye in the stream has a sequence number. TCP Retransmission for error recovery: Data in TCP flows in a byte stream. We got an application running, but certain request goes to another application for authentication and once authentication is done,īut some result just fails with 500 http code. The major reason is when the traffic comes in bursts and network capacity is exhausted. If TCP’s retransmissions don’t work because the loss rate is too high, TCP will give up. A few retransmissions are expected. ![]() Above you can see that after more than 1s a frame get's sent again. This can be caused by many things: packet errors, excessive buffering, traffic bursts. However, TCP’s mechanism for detecting corruption is not very good. TCP retransmissions If retransmissions are detected in a TCP connection, it is logical to assume that packet loss has occurred. Basically you have 2 likely possibilities, the initial connection is blocked or the server isn't operational. Reused port numbers is likely the client trying the connection again without changing the ephemeral port. Possible Solutionĭeployed redash helm app and configured it to use SAML login which is running on keycloak on the same cluster and when we click on SAML login and it fails some times with 502 http code and I see the retransmission packets in the pcap and when it works there is no issue in the pcap as well. If TCP notices packet loss or corruption, it will try to retransmit. Retransmission means the client isn't getting a response. I got the below captured at a host side (10.0.0. Some packets get retransmissioned sometime and sometime it works fine. 23665 4 877 227 My question is why a TCP flow make a re-transmission when a network has enough link bandwidth. TCP retranmission error on some request in pcap Expected BehaviorĪll the packet transfer should work without any retransmission Current Behavior
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