Client not responding TCP SYN-ACK packet ethernet driver The 2019 Stack Overflow Developer...

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Client not responding TCP SYN-ACK packet ethernet driver



The 2019 Stack Overflow Developer Survey Results Are InDoes TCP care about the incoming port?tcp port numbers reused on wiresharkMTU, RWIN, and MSSFTP disconnects after entering passive mode b/c packets are lostTCP SYN does not reach TCP serverSYN-ACK not receivedRST, ACK from 216.98.48.133 without any SYN from me? For real? How? Why?TCP connect fails with certain websitesClose a TCP connection using nmapWindows 7 stops responding to TCP request after random time





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I am developing an Ethernet driver and implementing TCP exchange code. To test my TCP code this is the scenario (monitored on wireshark):




Server: Custom Ethernet device



Client: PC





  1. I opened TCP client socket from hercules utility.

  2. I am able to see ARP request and response exchange from the ethernet device and hercules.

  3. After ARP request is served, client sends TCP SYN packet and server repsonses with SYN-ACK.

  4. To complete 3 way handshake client should send ACK at the end which I am not getting and hercules says TCP connection time out.


I need to diagnose the possible issue of why the client is not acknowledging SYN-ACK to complete 3-way handshake.



TCP SYN ACK packet exchange image










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    1















    I am developing an Ethernet driver and implementing TCP exchange code. To test my TCP code this is the scenario (monitored on wireshark):




    Server: Custom Ethernet device



    Client: PC





    1. I opened TCP client socket from hercules utility.

    2. I am able to see ARP request and response exchange from the ethernet device and hercules.

    3. After ARP request is served, client sends TCP SYN packet and server repsonses with SYN-ACK.

    4. To complete 3 way handshake client should send ACK at the end which I am not getting and hercules says TCP connection time out.


    I need to diagnose the possible issue of why the client is not acknowledging SYN-ACK to complete 3-way handshake.



    TCP SYN ACK packet exchange image










    share|improve this question









    New contributor




    RAJ JOHRI is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
    Check out our Code of Conduct.























      1












      1








      1








      I am developing an Ethernet driver and implementing TCP exchange code. To test my TCP code this is the scenario (monitored on wireshark):




      Server: Custom Ethernet device



      Client: PC





      1. I opened TCP client socket from hercules utility.

      2. I am able to see ARP request and response exchange from the ethernet device and hercules.

      3. After ARP request is served, client sends TCP SYN packet and server repsonses with SYN-ACK.

      4. To complete 3 way handshake client should send ACK at the end which I am not getting and hercules says TCP connection time out.


      I need to diagnose the possible issue of why the client is not acknowledging SYN-ACK to complete 3-way handshake.



      TCP SYN ACK packet exchange image










      share|improve this question









      New contributor




      RAJ JOHRI is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
      Check out our Code of Conduct.












      I am developing an Ethernet driver and implementing TCP exchange code. To test my TCP code this is the scenario (monitored on wireshark):




      Server: Custom Ethernet device



      Client: PC





      1. I opened TCP client socket from hercules utility.

      2. I am able to see ARP request and response exchange from the ethernet device and hercules.

      3. After ARP request is served, client sends TCP SYN packet and server repsonses with SYN-ACK.

      4. To complete 3 way handshake client should send ACK at the end which I am not getting and hercules says TCP connection time out.


      I need to diagnose the possible issue of why the client is not acknowledging SYN-ACK to complete 3-way handshake.



      TCP SYN ACK packet exchange image







      drivers ethernet tcp wireshark






      share|improve this question









      New contributor




      RAJ JOHRI is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
      Check out our Code of Conduct.











      share|improve this question









      New contributor




      RAJ JOHRI is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
      Check out our Code of Conduct.









      share|improve this question




      share|improve this question








      edited yesterday









      Tiago Caldeira

      1,224521




      1,224521






      New contributor




      RAJ JOHRI is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
      Check out our Code of Conduct.









      asked yesterday









      RAJ JOHRIRAJ JOHRI

      82




      82




      New contributor




      RAJ JOHRI is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
      Check out our Code of Conduct.





      New contributor





      RAJ JOHRI is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
      Check out our Code of Conduct.






      RAJ JOHRI is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
      Check out our Code of Conduct.






















          1 Answer
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          Where are you capturing, on the client or the server? If you're capturing on the client, then try enabling IP header checksum validation via "Edit -> Preferences -> Protocols -> IPv4 -> Validate the IPv4 checksum if possible".



          It looks to me like the IP header checksum of the server's SYN/ACK packet is 0, thus invalid, and if that's the case, you'll have to compute it; otherwise the client machine will drop the IP packet as being invalid.



          Note that if you're capturing on the client and the client's IP header checksum of the SYN packet is 0, then as Wireshark indicates, that's probably because the client machine is configured for "IP checksum offload" and Wireshark is receiving the packets before the checksum is computed by the hardware.



          If you really want to see what's going on, you should capture on a separate machine using a SPAN port or TAP; that way you will receive packets with proper checksums computed. For more information on capturing, you might want to have a look at Wireshark's Ethernet capture setup wiki page, or Jasper Bongertz' very helpful 6-part Network Capture Playbook, beginning with Part 1 - Ethernet Basics in which is referenced another one of his articles, The drawbacks of local packet captures.






          share|improve this answer


























          • Thanks Christopher. I am new user to superuser and don't have much credit score to up vote you. You gave nice and useful explanation solved my problem. Thanks once again. Some please up vote Christopher's answer.

            – RAJ JOHRI
            18 hours ago












          Your Answer








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          1 Answer
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          1 Answer
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          active

          oldest

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          active

          oldest

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          active

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          0














          Where are you capturing, on the client or the server? If you're capturing on the client, then try enabling IP header checksum validation via "Edit -> Preferences -> Protocols -> IPv4 -> Validate the IPv4 checksum if possible".



          It looks to me like the IP header checksum of the server's SYN/ACK packet is 0, thus invalid, and if that's the case, you'll have to compute it; otherwise the client machine will drop the IP packet as being invalid.



          Note that if you're capturing on the client and the client's IP header checksum of the SYN packet is 0, then as Wireshark indicates, that's probably because the client machine is configured for "IP checksum offload" and Wireshark is receiving the packets before the checksum is computed by the hardware.



          If you really want to see what's going on, you should capture on a separate machine using a SPAN port or TAP; that way you will receive packets with proper checksums computed. For more information on capturing, you might want to have a look at Wireshark's Ethernet capture setup wiki page, or Jasper Bongertz' very helpful 6-part Network Capture Playbook, beginning with Part 1 - Ethernet Basics in which is referenced another one of his articles, The drawbacks of local packet captures.






          share|improve this answer


























          • Thanks Christopher. I am new user to superuser and don't have much credit score to up vote you. You gave nice and useful explanation solved my problem. Thanks once again. Some please up vote Christopher's answer.

            – RAJ JOHRI
            18 hours ago
















          0














          Where are you capturing, on the client or the server? If you're capturing on the client, then try enabling IP header checksum validation via "Edit -> Preferences -> Protocols -> IPv4 -> Validate the IPv4 checksum if possible".



          It looks to me like the IP header checksum of the server's SYN/ACK packet is 0, thus invalid, and if that's the case, you'll have to compute it; otherwise the client machine will drop the IP packet as being invalid.



          Note that if you're capturing on the client and the client's IP header checksum of the SYN packet is 0, then as Wireshark indicates, that's probably because the client machine is configured for "IP checksum offload" and Wireshark is receiving the packets before the checksum is computed by the hardware.



          If you really want to see what's going on, you should capture on a separate machine using a SPAN port or TAP; that way you will receive packets with proper checksums computed. For more information on capturing, you might want to have a look at Wireshark's Ethernet capture setup wiki page, or Jasper Bongertz' very helpful 6-part Network Capture Playbook, beginning with Part 1 - Ethernet Basics in which is referenced another one of his articles, The drawbacks of local packet captures.






          share|improve this answer


























          • Thanks Christopher. I am new user to superuser and don't have much credit score to up vote you. You gave nice and useful explanation solved my problem. Thanks once again. Some please up vote Christopher's answer.

            – RAJ JOHRI
            18 hours ago














          0












          0








          0







          Where are you capturing, on the client or the server? If you're capturing on the client, then try enabling IP header checksum validation via "Edit -> Preferences -> Protocols -> IPv4 -> Validate the IPv4 checksum if possible".



          It looks to me like the IP header checksum of the server's SYN/ACK packet is 0, thus invalid, and if that's the case, you'll have to compute it; otherwise the client machine will drop the IP packet as being invalid.



          Note that if you're capturing on the client and the client's IP header checksum of the SYN packet is 0, then as Wireshark indicates, that's probably because the client machine is configured for "IP checksum offload" and Wireshark is receiving the packets before the checksum is computed by the hardware.



          If you really want to see what's going on, you should capture on a separate machine using a SPAN port or TAP; that way you will receive packets with proper checksums computed. For more information on capturing, you might want to have a look at Wireshark's Ethernet capture setup wiki page, or Jasper Bongertz' very helpful 6-part Network Capture Playbook, beginning with Part 1 - Ethernet Basics in which is referenced another one of his articles, The drawbacks of local packet captures.






          share|improve this answer















          Where are you capturing, on the client or the server? If you're capturing on the client, then try enabling IP header checksum validation via "Edit -> Preferences -> Protocols -> IPv4 -> Validate the IPv4 checksum if possible".



          It looks to me like the IP header checksum of the server's SYN/ACK packet is 0, thus invalid, and if that's the case, you'll have to compute it; otherwise the client machine will drop the IP packet as being invalid.



          Note that if you're capturing on the client and the client's IP header checksum of the SYN packet is 0, then as Wireshark indicates, that's probably because the client machine is configured for "IP checksum offload" and Wireshark is receiving the packets before the checksum is computed by the hardware.



          If you really want to see what's going on, you should capture on a separate machine using a SPAN port or TAP; that way you will receive packets with proper checksums computed. For more information on capturing, you might want to have a look at Wireshark's Ethernet capture setup wiki page, or Jasper Bongertz' very helpful 6-part Network Capture Playbook, beginning with Part 1 - Ethernet Basics in which is referenced another one of his articles, The drawbacks of local packet captures.







          share|improve this answer














          share|improve this answer



          share|improve this answer








          edited 17 hours ago

























          answered yesterday









          Christopher MaynardChristopher Maynard

          35617




          35617













          • Thanks Christopher. I am new user to superuser and don't have much credit score to up vote you. You gave nice and useful explanation solved my problem. Thanks once again. Some please up vote Christopher's answer.

            – RAJ JOHRI
            18 hours ago



















          • Thanks Christopher. I am new user to superuser and don't have much credit score to up vote you. You gave nice and useful explanation solved my problem. Thanks once again. Some please up vote Christopher's answer.

            – RAJ JOHRI
            18 hours ago

















          Thanks Christopher. I am new user to superuser and don't have much credit score to up vote you. You gave nice and useful explanation solved my problem. Thanks once again. Some please up vote Christopher's answer.

          – RAJ JOHRI
          18 hours ago





          Thanks Christopher. I am new user to superuser and don't have much credit score to up vote you. You gave nice and useful explanation solved my problem. Thanks once again. Some please up vote Christopher's answer.

          – RAJ JOHRI
          18 hours ago










          RAJ JOHRI is a new contributor. Be nice, and check out our Code of Conduct.










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